Merge remote-tracking branch 'FabricMC/dev/0.7' into dev/0.7-forge

# Conflicts:
#	.github/workflows/test-push.yml
#	build.gradle
#	src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java
#	src/main/java/net/fabricmc/loom/configuration/ide/RunConfig.java
#	src/main/java/net/fabricmc/loom/configuration/providers/MinecraftProvider.java
#	src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingsProvider.java
#	src/main/java/net/fabricmc/loom/configuration/providers/minecraft/MinecraftMappedProvider.java
#	src/main/java/net/fabricmc/loom/configuration/providers/minecraft/assets/MinecraftAssetsProvider.java
#	src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java
#	src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java
#	src/main/java/net/fabricmc/loom/task/RemapJarTask.java
#	src/main/java/net/fabricmc/loom/util/GroovyXmlUtil.java
#	src/main/java/net/fabricmc/loom/util/HashedDownloadUtil.java
#	src/test/groovy/net/fabricmc/loom/BuildUtils.groovy

20 files changed, 993 insertions, 443 deletions

diff --git a/src/test/groovy/net/fabricmc/loom/BuildUtils.groovy b/src/test/groovy/net/fabricmc/loom/BuildUtils.groovy
deleted file mode 100644
index e7ac743e..00000000
--- a/src/test/groovy/net/fabricmc/loom/BuildUtils.groovy
+++ /dev/null
@@ -1,211 +0,0 @@
-package net.fabricmc.loom
-
-import net.fabricmc.loom.util.Constants
-
-/**
- * Created by Mitchell Skaggs on 6/12/2019.
- */
-static String genBuildFile(String mappingsDep = "\"net.fabricmc:yarn:\${project.yarn_mappings}\"", String pluginId = Constants.PLUGIN_ID) {
-	"""
-plugins {
-	id '${pluginId}'
-	id 'maven-publish'
-}
-sourceCompatibility = JavaVersion.VERSION_1_8
-targetCompatibility = JavaVersion.VERSION_1_8
-
-archivesBaseName = project.archives_base_name
-version = project.mod_version
-group = project.maven_group
-
-
-minecraft {
-}
-
-dependencies {
-	//to change the versions see the gradle.properties file
-	minecraft "com.mojang:minecraft:\${project.minecraft_version}"
-	mappings ${mappingsDep}
-	modImplementation "net.fabricmc:fabric-loader:\${project.loader_version}"
-
-	// Fabric API. This is technically optional, but you probably want it anyway.
-	modImplementation "net.fabricmc.fabric-api:fabric-api:\${project.fabric_version}"
-
-	// PSA: Some older mods, compiled on Loom 0.2.1, might have outdated Maven POMs.
-	// You may need to force-disable transitiveness on them.
-}
-
-processResources {
-	inputs.property "version", project.version
-
-	filesMatching("fabric.mod.json") {
-		expand "version": project.version
-	}
-}
-
-// ensure that the encoding is set to UTF-8, no matter what the system default is
-// this fixes some edge cases with special characters not displaying correctly
-// see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
-tasks.withType(JavaCompile) {
-	options.encoding = "UTF-8"
-}
-
-// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
-// if it is present.
-// If you remove this task, sources will not be generated.
-task sourcesJar(type: Jar, dependsOn: classes) {
-	classifier = "sources"
-	from sourceSets.main.allSource
-}
-
-jar {
-	from "LICENSE"
-}
-
-// configure the maven publication
-publishing {
-	publications {
-		mavenJava(MavenPublication) {
-			// add all the jars that should be included when publishing to maven
-			artifact(jar) {
-				builtBy remapJar
-			}
-			artifact(sourcesJar) {
-				builtBy remapSourcesJar
-			}
-		}
-	}
-
-	// select the repositories you want to publish to
-	repositories {
-		// uncomment to publish to the local maven
-		// mavenLocal()
-	}
-}
-"""
-}
-
-static String genPropsFile(String mcVersion, String yarnVersion, String loaderVersion, String fabricVersion, boolean caching = true, boolean parallel = true) {
-	"""
-org.gradle.caching=$caching
-org.gradle.parallel=$parallel
-
-# Fabric Properties
-# check these on https://fabricmc.net/use
-minecraft_version=$mcVersion
-yarn_mappings=$yarnVersion
-loader_version=$loaderVersion
-
-# Mod Properties
-mod_version = 1.0.0
-maven_group = net.fabricmc
-archives_base_name = fabric-example-mod
-
-# Dependencies
-# currently not on the main fabric site, check on the maven: https://maven.fabricmc.net/net/fabricmc/fabric
-fabric_version=$fabricVersion
-"""
-}
-
-static String genSettingsFile(String name) {
-	"""
-rootProject.name = '$name'
-"""
-}
-
-static String genModJsonFile() {
-	"""
-{
-  "schemaVersion": 1,
-  "id": "modid",
-  "version": "\${version}",
-
-  "name": "Example Mod",
-  "description": "This is an example description! Tell everyone what your mod is about!",
-  "authors": [
-    "Me!"
-  ],
-  "contact": {
-    "homepage": "https://fabricmc.net/",
-    "sources": "https://github.com/FabricMC/fabric-example-mod"
-  },
-
-  "license": "CC0-1.0",
-
-  "environment": "*",
-  "entrypoints": {
-    "main": [
-      "net.fabricmc.example.ExampleMod"
-    ]
-  },
-  "mixins": [
-    "modid.mixins.json"
-  ],
-
-  "depends": {
-    "fabricloader": ">=0.4.0",
-    "fabric": "*"
-  },
-  "suggests": {
-    "flamingo": "*"
-  }
-}
-"""
-}
-
-static String genModJavaFile() {
-	"""
-package net.fabricmc.example;
-
-import net.fabricmc.api.ModInitializer;
-
-public class ExampleMod implements ModInitializer {
-	@Override
-	public void onInitialize() {
-		// This code runs as soon as Minecraft is in a mod-load-ready state.
-		// However, some things (like resources) may still be uninitialized.
-		// Proceed with mild caution.
-
-		System.out.println("Hello Fabric world!");
-	}
-}
-"""
-}
-
-static String genModMixinsJsonFile() {
-	"""
-{
-  "required": true,
-  "package": "net.fabricmc.example.mixin",
-  "compatibilityLevel": "JAVA_8",
-  "mixins": [
-  ],
-  "client": [
-    "ExampleMixin"
-  ],
-  "injectors": {
-    "defaultRequire": 1
-  }
-}
-"""
-}
-
-static String genModMixinsJavaFile() {
-	"""
-package net.fabricmc.example.mixin;
-
-import net.minecraft.client.MinecraftClient;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
-
-@Mixin(MinecraftClient.class)
-public class ExampleMixin {
-	@Inject(at = @At("HEAD"), method = "init()V")
-	private void init(CallbackInfo info) {
-		System.out.println("This line is printed by an example mod mixin!");
-	}
-}
-"""
-}
diff --git a/src/test/groovy/net/fabricmc/loom/EmptyBuildFunctionalTest.groovy b/src/test/groovy/net/fabricmc/loom/EmptyBuildFunctionalTest.groovy
deleted file mode 100644
index 996ab656..00000000
--- a/src/test/groovy/net/fabricmc/loom/EmptyBuildFunctionalTest.groovy
+++ /dev/null
@@ -1,51 +0,0 @@
-package net.fabricmc.loom
-
-import org.gradle.testkit.runner.GradleRunner
-import org.junit.Rule
-import org.junit.rules.TemporaryFolder
-import spock.lang.Specification
-import spock.lang.Unroll
-
-import static net.fabricmc.loom.BuildUtils.*
-import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
-
-/**
- * Created by Mitchell Skaggs on 6/10/2019.
- */
-class EmptyBuildFunctionalTest extends Specification {
-	@Rule
-	TemporaryFolder testProjectDir = new TemporaryFolder()
-	File settingsFile
-	File buildFile
-	File propsFile
-
-	def setup() {
-		settingsFile = testProjectDir.newFile('settings.gradle')
-		buildFile = testProjectDir.newFile('build.gradle')
-		propsFile = testProjectDir.newFile('gradle.properties')
-	}
-
-	@Unroll
-	def "empty build succeeds using Minecraft #mcVersion"() {
-		given:
-		settingsFile << genSettingsFile("empty-build-functional-test")
-		propsFile << genPropsFile(mcVersion, yarnVersion, loaderVersion, fabricVersion)
-		buildFile << genBuildFile()
-
-		when:
-		def result = GradleRunner.create()
-				.withProjectDir(testProjectDir.root)
-				.withArguments('build',"--stacktrace", "--warning-mode", System.getenv().TEST_WARNING_MODE ?: 'all')
-				.withPluginClasspath()
-				.forwardOutput()
-				.build()
-
-		then:
-		result.task(":build").outcome == SUCCESS
-
-		where:
-		mcVersion | yarnVersion       		| loaderVersion     | fabricVersion
-		'1.14'    | '1.14+build.21'   		| '0.4.8+build.155' | '0.3.0+build.183'
-		'1.16.2'  | '1.16.2+build.26:v2' 	| '0.9.2+build.206' | '0.19.0+build.398-1.16'
-	}
-}
diff --git a/src/test/groovy/net/fabricmc/loom/EmptyBuildMojangFunctionalTest.groovy b/src/test/groovy/net/fabricmc/loom/EmptyBuildMojangFunctionalTest.groovy
deleted file mode 100644
index d360ba6f..00000000
--- a/src/test/groovy/net/fabricmc/loom/EmptyBuildMojangFunctionalTest.groovy
+++ /dev/null
@@ -1,50 +0,0 @@
-package net.fabricmc.loom
-
-import org.gradle.testkit.runner.GradleRunner
-import org.junit.Rule
-import org.junit.rules.TemporaryFolder
-import spock.lang.Specification
-import spock.lang.Unroll
-
-import static net.fabricmc.loom.BuildUtils.*
-import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
-
-/**
- * Created by Mitchell Skaggs on 6/10/2019.
- */
-class EmptyBuildMojangFunctionalTest extends Specification {
-	@Rule
-	TemporaryFolder testProjectDir = new TemporaryFolder()
-	File settingsFile
-	File buildFile
-	File propsFile
-
-	def setup() {
-		settingsFile = testProjectDir.newFile('settings.gradle')
-		buildFile = testProjectDir.newFile('build.gradle')
-		propsFile = testProjectDir.newFile('gradle.properties')
-	}
-
-	@Unroll
-	def "empty build succeeds using Minecraft #mcVersion"() {
-		given:
-		settingsFile << genSettingsFile("empty-build-functional-test")
-		propsFile << genPropsFile(mcVersion, "nope", loaderVersion, fabricVersion)
-		buildFile << genBuildFile("minecraft.officialMojangMappings()")
-
-		when:
-		def result = GradleRunner.create()
-				.withProjectDir(testProjectDir.root)
-				.withArguments('build',"--stacktrace", "--warning-mode", System.getenv().TEST_WARNING_MODE ?: 'all')
-				.withPluginClasspath()
-				.forwardOutput()
-				.build()
-
-		then:
-		result.task(":build").outcome == SUCCESS
-
-		where:
-		mcVersion	| loaderVersion     | fabricVersion
-		'1.16.2'	| '0.9.2+build.206' | '0.19.0+build.398-1.16'
-	}
-}
diff --git a/src/test/groovy/net/fabricmc/loom/MixinBuildFunctionalTest.groovy b/src/test/groovy/net/fabricmc/loom/MixinBuildFunctionalTest.groovy
deleted file mode 100644
index b40a2ba7..00000000
--- a/src/test/groovy/net/fabricmc/loom/MixinBuildFunctionalTest.groovy
+++ /dev/null
@@ -1,69 +0,0 @@
-package net.fabricmc.loom
-
-import org.gradle.testkit.runner.GradleRunner
-import org.junit.Rule
-import org.junit.rules.TemporaryFolder
-import spock.lang.Ignore
-import spock.lang.Specification
-import spock.lang.Unroll
-
-import static net.fabricmc.loom.BuildUtils.*
-import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
-
-/**
- * Created by Mitchell Skaggs on 6/10/2019.
- */
-class MixinBuildFunctionalTest extends Specification {
-	@Rule
-	TemporaryFolder testProjectDir = new TemporaryFolder()
-	File settingsFile
-	File buildFile
-	File propsFile
-	File modJsonFile
-	File modJavaFile
-	File modMixinsJsonFile
-	File modMixinsJavaFile
-
-	def setup() {
-		settingsFile = testProjectDir.newFile('settings.gradle')
-		buildFile = testProjectDir.newFile('build.gradle')
-		propsFile = testProjectDir.newFile('gradle.properties')
-
-		testProjectDir.newFolder("src", "main", "resources")
-		modJsonFile = testProjectDir.newFile('src/main/resources/fabric.mod.json')
-		modMixinsJsonFile = testProjectDir.newFile('src/main/resources/modid.mixins.json')
-
-		testProjectDir.newFolder("src", "main", "java", "net", "fabricmc", "example")
-		modJavaFile = testProjectDir.newFile("src/main/java/net/fabricmc/example/ExampleMod.java")
-
-		testProjectDir.newFolder("src", "main", "java", "net", "fabricmc", "example", "mixin")
-		modMixinsJavaFile = testProjectDir.newFile("src/main/java/net/fabricmc/example/mixin/ExampleMixin.java")
-	}
-
-	@Unroll
-	def "mixin build succeeds using Minecraft #mcVersion"() {
-		given:
-		settingsFile << genSettingsFile("mixin-build-functional-test")
-		propsFile << genPropsFile(mcVersion, yarnVersion, loaderVersion, fabricVersion)
-		buildFile << genBuildFile()
-		modJsonFile << genModJsonFile()
-		modJavaFile << genModJavaFile()
-		modMixinsJsonFile << genModMixinsJsonFile()
-		modMixinsJavaFile << genModMixinsJavaFile()
-
-		when:
-		def result = GradleRunner.create()
-				.withProjectDir(testProjectDir.root)
-				.withArguments('build','--stacktrace', "--warning-mode", System.getenv().TEST_WARNING_MODE ?: 'all')
-				.withPluginClasspath()
-				.forwardOutput()
-				.build()
-
-		then:
-		result.task(":build").outcome == SUCCESS
-
-		where:
-		mcVersion | yarnVersion       	| loaderVersion     | fabricVersion
-		'1.14'    | '1.14+build.21'   	| '0.4.8+build.155' | '0.3.0+build.184'
-	}
-}
diff --git a/src/test/groovy/net/fabricmc/loom/SimpleBuildFunctionalTest.groovy b/src/test/groovy/net/fabricmc/loom/SimpleBuildFunctionalTest.groovy
deleted file mode 100644
index 756a3faa..00000000
--- a/src/test/groovy/net/fabricmc/loom/SimpleBuildFunctionalTest.groovy
+++ /dev/null
@@ -1,62 +0,0 @@
-package net.fabricmc.loom
-
-import org.gradle.testkit.runner.GradleRunner
-import org.junit.Rule
-import org.junit.rules.TemporaryFolder
-import spock.lang.Specification
-import spock.lang.Unroll
-
-import static net.fabricmc.loom.BuildUtils.*
-import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
-
-/**
- * Created by Mitchell Skaggs on 6/10/2019.
- */
-class SimpleBuildFunctionalTest extends Specification {
-	@Rule
-	TemporaryFolder testProjectDir = new TemporaryFolder()
-	File settingsFile
-	File buildFile
-	File propsFile
-	File modJsonFile
-	File modExampleFile
-
-	def setup() {
-		settingsFile = testProjectDir.newFile('settings.gradle')
-		buildFile = testProjectDir.newFile('build.gradle')
-		propsFile = testProjectDir.newFile('gradle.properties')
-
-		testProjectDir.newFolder("src", "main", "resources")
-		modJsonFile = testProjectDir.newFile('src/main/resources/fabric.mod.json')
-
-		testProjectDir.newFolder("src", "main", "java", "net", "fabricmc", "example")
-		modExampleFile = testProjectDir.newFile("src/main/java/net/fabricmc/example/ExampleMod.java")
-	}
-
-	@Unroll
-	def "simple build succeeds using Minecraft #mcVersion"() {
-		given:
-		settingsFile << genSettingsFile("simple-build-functional-test")
-		propsFile << genPropsFile(mcVersion, yarnVersion, loaderVersion, fabricVersion)
-		buildFile << genBuildFile()
-		modJsonFile << genModJsonFile()
-		modExampleFile << genModJavaFile()
-
-		when:
-		def result = GradleRunner.create()
-				.withProjectDir(testProjectDir.root)
-				.withArguments('build',"--stacktrace", "--warning-mode", System.getenv().TEST_WARNING_MODE ?: 'all')
-				.withPluginClasspath()
-				.forwardOutput()
-				.withDebug(true)
-				.build()
-
-		then:
-		result.task(":build").outcome == SUCCESS
-
-		where:
-		mcVersion | yarnVersion       | loaderVersion     | fabricVersion
-		'19w45a'  | '19w45a+build.2:v2'   | '0.6.2+build.166' | '0.4.9+build.258-1.15'
-		'1.14'    | '1.14+build.21'   | '0.4.8+build.155' | '0.3.0+build.184'
-	}
-}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/AccessWidenerTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/AccessWidenerTest.groovy
new file mode 100644
index 00000000..0cde47a5
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/AccessWidenerTest.groovy
@@ -0,0 +1,56 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ArchiveAssertionsTrait
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class AccessWidenerTest extends Specification implements ProjectTestTrait, ArchiveAssertionsTrait {
+	@Override
+	String name() {
+		"accesswidener"
+	}
+
+	@Unroll
+	def "accesswidener (gradle #gradle)"() {
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+			getArchiveEntry("fabric-example-mod-1.0.0.jar", "modid.accesswidener") == expected().replaceAll('\r', '')
+		where:
+			gradle              | _
+			DEFAULT_GRADLE      | _
+			PRE_RELEASE_GRADLE  | _
+	}
+
+	String expected() {
+		new File("src/test/resources/accesswidener/expected.accesswidener").text
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/DecompileTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/DecompileTest.groovy
new file mode 100644
index 00000000..4e4c182a
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/DecompileTest.groovy
@@ -0,0 +1,54 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class DecompileTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"decompile"
+	}
+
+	@Unroll
+	def "#decompiler gradle #gradle"() {
+		when:
+			def result = create(task, gradle)
+
+		then:
+			result.task(":${task}").outcome == SUCCESS
+
+		where:
+			decompiler 		| task								| gradle
+			'fernflower'	| "genSources"						| DEFAULT_GRADLE
+			'fernflower'	| "genSources"						| LEGACY_GRADLE
+			'fernflower'	| "genSources"						| PRE_RELEASE_GRADLE
+			'cfr' 			| "genSourcesWithExperimentalCfr"	| DEFAULT_GRADLE
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/KotlinTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/KotlinTest.groovy
new file mode 100644
index 00000000..a2d2ec03
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/KotlinTest.groovy
@@ -0,0 +1,50 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class KotlinTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"kotlin"
+	}
+
+	@Unroll
+	def "kotlin build (gradle #gradle)"() {
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+		where:
+			gradle              | _
+			DEFAULT_GRADLE      | _
+			PRE_RELEASE_GRADLE  | _
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/LegacyProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/LegacyProjectTest.groovy
new file mode 100644
index 00000000..6187f02e
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/LegacyProjectTest.groovy
@@ -0,0 +1,47 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+// This test uses gradle 4.9 and 1.14.4 v1 mappings
+class LegacyProjectTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"legacy"
+	}
+
+	@Unroll
+	def "build"() {
+		when:
+			def result = create("build", LEGACY_GRADLE)
+		then:
+			result.task(":build").outcome == SUCCESS
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/MavenProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/MavenProjectTest.groovy
new file mode 100644
index 00000000..6358b7e4
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/MavenProjectTest.groovy
@@ -0,0 +1,98 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ArchiveAssertionsTrait
+import net.fabricmc.loom.test.util.MockMavenServerTrait
+import spock.lang.Specification
+import spock.lang.Stepwise
+import spock.lang.Unroll
+import spock.util.environment.RestoreSystemProperties
+
+import static java.lang.System.setProperty
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+/**
+ * This tests publishing a range of versions and then tries to resolve and build against them
+ */
+@Stepwise
+class MavenProjectTest extends Specification implements MockMavenServerTrait, ArchiveAssertionsTrait {
+	@RestoreSystemProperties
+	@Unroll
+	def "publish lib #version #gradle"() {
+		given:
+			setProperty('loom.test.version', version)
+			library = true
+		when:
+			def result = create("publish", gradle)
+		then:
+			result.task(":publish").outcome == SUCCESS
+			hasArchiveEntry("fabric-example-lib-${version}.jar", "net/fabricmc/example/ExampleLib.class")
+		where:
+			version           | gradle
+			'1.0.0'           | DEFAULT_GRADLE
+			'1.0.0'           | PRE_RELEASE_GRADLE
+			'1.1.0'           | DEFAULT_GRADLE
+			'1.1.1'           | DEFAULT_GRADLE
+			'1.2.0+meta'      | DEFAULT_GRADLE
+			'2.0.0-SNAPSHOT'  | DEFAULT_GRADLE
+			'2.0.0-SNAPSHOT'  | DEFAULT_GRADLE // Publish this twice to give ourselves a bit of a challenge
+			'master-SNAPSHOT' | DEFAULT_GRADLE
+	}
+
+	@RestoreSystemProperties
+	@Unroll
+	def "resolve #version #gradle"() {
+		given:
+			setProperty('loom.test.resolve', "com.example:fabric-example-lib:${version}")
+			library = false
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+			hasArchiveEntry("fabric-example-mod-1.0.0.jar", "net/fabricmc/examplemod/ExampleMod.class")
+		where:
+			version                      | gradle
+			'1.0.0'                      | DEFAULT_GRADLE
+			'1.0.0'                      | PRE_RELEASE_GRADLE
+			'1.1.+'                      | DEFAULT_GRADLE
+			'1.2.0+meta'                 | DEFAULT_GRADLE
+			'2.0.0-SNAPSHOT'             | DEFAULT_GRADLE
+			'master-SNAPSHOT'            | DEFAULT_GRADLE
+			'1.0.0:classifier'           | DEFAULT_GRADLE
+			'1.1.+:classifier'           | DEFAULT_GRADLE
+			'1.2.0+meta:classifier'      | DEFAULT_GRADLE
+			'2.0.0-SNAPSHOT:classifier'  | DEFAULT_GRADLE
+			'master-SNAPSHOT:classifier' | DEFAULT_GRADLE
+	}
+
+	// Set to true when to build and publish the mavenLibrary
+	private boolean library = false
+
+	@Override
+	String name() {
+		library ? "mavenLibrary" : "maven"
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/MojangMappingsProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/MojangMappingsProjectTest.groovy
new file mode 100644
index 00000000..a98fb851
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/MojangMappingsProjectTest.groovy
@@ -0,0 +1,50 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class MojangMappingsProjectTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"mojangMappings"
+	}
+
+	@Unroll
+	def "build (gradle #gradle)"() {
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+		where:
+			gradle              | _
+			DEFAULT_GRADLE      | _
+			PRE_RELEASE_GRADLE  | _
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/MultiProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/MultiProjectTest.groovy
new file mode 100644
index 00000000..05317dcc
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/MultiProjectTest.groovy
@@ -0,0 +1,61 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ArchiveAssertionsTrait
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class MultiProjectTest extends Specification implements ProjectTestTrait, ArchiveAssertionsTrait {
+	@Override
+	String name() {
+		"multiproject"
+	}
+
+	@Unroll
+	def "build (gradle #gradle)"() {
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+			result.task(":core:build").outcome == SUCCESS
+			result.task(":example:build").outcome == SUCCESS
+
+			result.task(":remapAllJars").outcome == SUCCESS
+			result.task(":remapAllSources").outcome == SUCCESS
+
+			hasArchiveEntry("multiproject-1.0.0.jar", "META-INF/jars/example-1.0.0.jar")
+			hasArchiveEntry("multiproject-1.0.0.jar", "META-INF/jars/core-1.0.0.jar")
+			hasArchiveEntry("multiproject-1.0.0.jar", "META-INF/jars/fabric-api-base-0.2.1+9354966b7d.jar")
+
+		where:
+			gradle              | _
+			DEFAULT_GRADLE      | _
+			PRE_RELEASE_GRADLE  | _
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/ReproducibleBuildTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/ReproducibleBuildTest.groovy
new file mode 100644
index 00000000..8bcac7b6
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/ReproducibleBuildTest.groovy
@@ -0,0 +1,64 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import com.google.common.hash.HashCode
+import com.google.common.hash.Hashing
+import com.google.common.io.Files
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class ReproducibleBuildTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"reproducible"
+	}
+
+	@Unroll
+	def "build (gradle #gradle)"() {
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+			getOutputHash("fabric-example-mod-1.0.0.jar") == modHash
+			getOutputHash("fabric-example-mod-1.0.0-sources.jar") in sourceHash // Done for different line endings.
+		where:
+			gradle      | modHash                               | sourceHash
+			'6.8.3'     | "6132ffb4117adb7e258f663110552952"    | ["be31766e6cafbe4ae3bca9e35ba63169", "7348b0bd87d36d7ec6f3bca9c2b66062"]
+			'7.0-rc-1'  | "6132ffb4117adb7e258f663110552952"    | ["be31766e6cafbe4ae3bca9e35ba63169", "7348b0bd87d36d7ec6f3bca9c2b66062"]
+	}
+
+	String getOutputHash(String name) {
+		generateMD5(getOutputFile(name))
+	}
+
+	String generateMD5(File file) {
+		HashCode hash = Files.asByteSource(file).hash(Hashing.md5())
+		return hash.asBytes().encodeHex() as String
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/RunConfigTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/RunConfigTest.groovy
new file mode 100644
index 00000000..6ffb1130
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/RunConfigTest.groovy
@@ -0,0 +1,54 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+// This test runs a mod that exits on mod init
+class RunConfigTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"runconfigs"
+	}
+
+	@Unroll
+	def "#task"() {
+		when:
+			def result = create(task)
+		then:
+			result.task(":${task}").outcome == SUCCESS
+		where:
+			task                | _
+			'runClient'         | _
+			'runServer'         | _
+			'runTestmodClient'  | _
+			'runTestmodServer'  | _
+			'runAutoTestServer' | _
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/SimpleProjectTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/SimpleProjectTest.groovy
new file mode 100644
index 00000000..8be25043
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/SimpleProjectTest.groovy
@@ -0,0 +1,63 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import spock.lang.Specification
+import spock.lang.Unroll
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class SimpleProjectTest extends Specification implements ProjectTestTrait {
+	@Override
+	String name() {
+		"simple"
+	}
+
+	@Unroll
+	def "build (gradle #gradle)"() {
+		when:
+			def result = create("build", gradle)
+		then:
+			result.task(":build").outcome == SUCCESS
+		where:
+			gradle              | _
+			DEFAULT_GRADLE      | _
+			PRE_RELEASE_GRADLE  | _
+	}
+
+	@Unroll
+	def "#ide config generation"() {
+		when:
+			def result = create(ide)
+		then:
+			result.task(":${ide}").outcome == SUCCESS
+		where:
+			ide 		| _
+			'idea' 		| _
+			'eclipse'	| _
+			'vscode'	| _
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/intergration/UnpickTest.groovy b/src/test/groovy/net/fabricmc/loom/test/intergration/UnpickTest.groovy
new file mode 100644
index 00000000..da1de2de
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/intergration/UnpickTest.groovy
@@ -0,0 +1,62 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.intergration
+
+import net.fabricmc.loom.test.util.ProjectTestTrait
+import org.zeroturnaround.zip.ZipUtil
+import spock.lang.Specification
+
+import java.nio.charset.StandardCharsets
+
+import static org.gradle.testkit.runner.TaskOutcome.SUCCESS
+
+class UnpickTest extends Specification implements ProjectTestTrait {
+	static final String MAPPINGS = "21w13a-mapped-net.fabricmc.yarn-21w13a+build.30-v2"
+
+	@Override
+	String name() {
+		"unpick"
+	}
+
+	def "unpick decompile"() {
+		when:
+			def result = create("genSources")
+		then:
+			result.task(":genSources").outcome == SUCCESS
+			getClassSource("net/minecraft/block/CakeBlock.java").contains("Block.DEFAULT_SET_BLOCK_STATE_FLAG")
+	}
+
+	def "unpick build"() {
+		when:
+			def result = create("build")
+		then:
+			result.task(":build").outcome == SUCCESS
+	}
+
+	String getClassSource(String classname, String mappings = MAPPINGS) {
+		File sourcesJar = getGeneratedSources(mappings)
+		return new String(ZipUtil.unpackEntry(sourcesJar, classname), StandardCharsets.UTF_8)
+	}
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/unit/GroovyXmlUtilTest.groovy b/src/test/groovy/net/fabricmc/loom/test/unit/GroovyXmlUtilTest.groovy
new file mode 100644
index 00000000..4d6353a9
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/unit/GroovyXmlUtilTest.groovy
@@ -0,0 +1,74 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.unit
+
+import groovy.xml.QName
+import net.fabricmc.loom.util.GroovyXmlUtil
+import spock.lang.Specification
+
+class GroovyXmlUtilTest extends Specification {
+    def "getOrCreateNode finds existing node"() {
+        when:
+            def xmlTree = new XmlParser().parseText(text)
+            def existingNode = xmlTree[innerName]
+            def actualNode = GroovyXmlUtil.getOrCreateNode(xmlTree, innerName)
+
+        then:
+            existingNode.text() == actualNode.text()
+
+        where:
+            innerName          | text
+            "bar"              | "<foo><bar>inner content to ensure correct</bar></foo>"
+            "dependencies"     | "<project xmlns=\"http://maven.apache.org/POM/4.0.0\"><dependencies>inner content to ensure correct</dependencies></project>"
+    }
+
+    def "getOrCreateNode creates a node if needed"() {
+        when:
+            def xmlTree = new XmlParser().parseText(text)
+            def actualNode = GroovyXmlUtil.getOrCreateNode(xmlTree, innerName)
+
+        then:
+            xmlTree[QName.valueOf(actualNode.name().toString())] != null
+
+        where:
+            innerName          | text
+            "bar"              | "<foo></foo>"
+            "dependencies"     | "<project xmlns=\"http://maven.apache.org/POM/4.0.0\"></project>"
+    }
+
+    def "getNode finds existing node"() {
+        when:
+            def xmlTree = new XmlParser().parseText(text)
+            def actualNode = GroovyXmlUtil.getNode(xmlTree, innerName)
+
+        then:
+            actualNode.isPresent()
+
+        where:
+            innerName          | text
+            "bar"              | "<foo><bar>inner content to ensure correct</bar></foo>"
+            "dependencies"     | "<project xmlns=\"http://maven.apache.org/POM/4.0.0\"><dependencies>inner content to ensure correct</dependencies></project>"
+    }
+}
diff --git a/src/test/groovy/net/fabricmc/loom/test/util/ArchiveAssertionsTrait.groovy b/src/test/groovy/net/fabricmc/loom/test/util/ArchiveAssertionsTrait.groovy
new file mode 100644
index 00000000..fa4492fc
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/util/ArchiveAssertionsTrait.groovy
@@ -0,0 +1,46 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.util
+
+import org.zeroturnaround.zip.ZipUtil
+
+trait ArchiveAssertionsTrait {
+	String getArchiveEntry(String name, String entry, String project = "") {
+		def file = getOutputFile(name, project)
+
+		def bytes = ZipUtil.unpackEntry(file, entry)
+
+		if (bytes == null) {
+			throw new FileNotFoundException("Could not find ${entry} in ${name}")
+		}
+
+		new String(bytes as byte[])
+	}
+
+	boolean hasArchiveEntry(String name, String entry, String project = "") {
+		def file = getOutputFile(name, project)
+		ZipUtil.unpackEntry(file, entry) != null
+	}
+}
\ No newline at end of file
diff --git a/src/test/groovy/net/fabricmc/loom/test/util/MockMavenServerTrait.groovy b/src/test/groovy/net/fabricmc/loom/test/util/MockMavenServerTrait.groovy
new file mode 100644
index 00000000..604c1faa
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/util/MockMavenServerTrait.groovy
@@ -0,0 +1,91 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.util
+
+import io.javalin.Javalin
+import org.apache.commons.io.IOUtils
+
+trait MockMavenServerTrait extends ProjectTestTrait {
+    public final int mavenServerPort = 9876
+    public final File testMavenDir = File.createTempDir()
+    private Javalin server
+
+    @SuppressWarnings('unused')
+    def setupSpec() {
+        println "Maven server path: ${testMavenDir.absolutePath}"
+
+        server = Javalin.create { config ->
+            config.enableDevLogging()
+        }.start(mavenServerPort)
+
+        /**
+         * A very very basic maven server impl, DO NOT copy this and use in production as its not secure
+         */
+        server.get("*") { ctx ->
+            println "GET: " + ctx.path()
+            File file = getMavenPath(ctx.path())
+
+            if (!file.exists()) {
+                ctx.status(404)
+                return
+            }
+
+            ctx.result(file.bytes)
+        }
+
+        server.put("*") { ctx ->
+            println "PUT: " + ctx.path()
+            File file = getMavenPath(ctx.path())
+            file.parentFile.mkdirs()
+
+            file.withOutputStream {
+                IOUtils.copy(ctx.bodyAsInputStream(), it)
+            }
+        }
+    }
+
+    @SuppressWarnings('unused')
+    def setup() {
+        System.setProperty('loom.test.mavenPort', port())
+    }
+
+    @SuppressWarnings('unused')
+    def cleanupSpec() {
+        server.stop()
+        super.cleanupSpec()
+    }
+
+    File getMavenDirectory() {
+        new File(testMavenDir, "maven")
+    }
+
+    File getMavenPath(String path) {
+        new File(getMavenDirectory(), path)
+    }
+
+    String port() {
+        "${mavenServerPort}"
+    }
+}
\ No newline at end of file
diff --git a/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy b/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy
new file mode 100644
index 00000000..619973e2
--- /dev/null
+++ b/src/test/groovy/net/fabricmc/loom/test/util/ProjectTestTrait.groovy
@@ -0,0 +1,123 @@
+/*
+ * This file is part of fabric-loom, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) 2016, 2017, 2018 FabricMC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package net.fabricmc.loom.test.util
+
+import org.gradle.testkit.runner.BuildResult
+import org.gradle.testkit.runner.GradleRunner
+
+trait ProjectTestTrait {
+	final static String LEGACY_GRADLE = "4.9"
+	final static String DEFAULT_GRADLE = "6.8.3"
+	final static String PRE_RELEASE_GRADLE = "7.0-rc-2"
+
+	static File gradleHome = File.createTempDir()
+	File testProjectDir = File.createTempDir()
+
+	abstract String name()
+
+	def copyInputFiles() {
+		println "Project directory: ${testProjectDir}"
+
+		def baseProjectDir = new File("src/test/resources/projects/" + name())
+
+		if (!baseProjectDir.exists()) {
+			throw new FileNotFoundException("Failed to find project directory at:" + baseProjectDir.absolutePath)
+		}
+
+		baseProjectDir.eachFileRecurse { file ->
+			if (file.isDirectory()) {
+				return
+			}
+
+			def path = file.path.replace(baseProjectDir.path, "")
+
+			File tempFile = new File(testProjectDir, path)
+
+			if (tempFile.exists()) {
+				tempFile.delete()
+			}
+
+			tempFile.parentFile.mkdirs()
+			tempFile << file.text
+		}
+
+		// Disable the CI checks to ensure nothing is skipped
+		System.setProperty("fabric.loom.ci", "false")
+	}
+
+	@SuppressWarnings('unused')
+	def cleanup() {
+		// Clean after each test
+		new File(testProjectDir, "build").deleteDir()
+		new File(testProjectDir, ".gradle").deleteDir()
+	}
+
+	@SuppressWarnings('unused')
+	def cleanupSpec() {
+		testProjectDir.deleteDir()
+		gradleHome.deleteDir()
+	}
+
+	BuildResult create(String task, String gradleVersion = DEFAULT_GRADLE) {
+		System.setProperty("fabric.loom.test", "true")
+		copyInputFiles()
+
+		GradleRunner.create()
+			.withProjectDir(testProjectDir)
+			.withArguments(task, "--stacktrace", "--warning-mode", warningMode(gradleVersion), "--gradle-user-home", gradleHomeDirectory(gradleVersion))
+			.withPluginClasspath()
+			.withGradleVersion(gradleVersion)
+			.forwardOutput()
+			.withDebug(true)
+			.build()
+	}
+
+	String warningMode(String gradleVersion) {
+		if (gradleVersion == LEGACY_GRADLE) {
+			return "all"
+		}
+
+		'fail'
+	}
+
+	String gradleHomeDirectory(String gradleVersion) {
+		// Each gradle version gets its own dir to run on, to ensure that a full run is done.
+		new File(gradleHome, gradleVersion).absolutePath
+	}
+
+	File getOutputFile(String name, String project = "") {
+		def file = new File(testProjectDir, "${project}build/libs/${name}")
+
+		if (!file.exists()) {
+			throw new FileNotFoundException("Could not find ${name} at ${file.absolutePath}")
+		}
+
+		return file
+	}
+
+	File getGeneratedSources(String mappings, String gradleVersion = DEFAULT_GRADLE) {
+		return new File(gradleHomeDirectory(gradleVersion), "caches/fabric-loom/${mappings}/minecraft-${mappings}-sources.jar")
+	}
+}
\ No newline at end of file