Add basic multiplatform gradle integration test

20 files changed, 452 insertions, 27 deletions

diff --git a/integration-tests/gradle/projects/it-multiplatform-0/build.gradle.kts b/integration-tests/gradle/projects/it-multiplatform-0/build.gradle.kts
new file mode 100644
index 00000000..1059f21a
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/build.gradle.kts
@@ -0,0 +1,25 @@
+import org.jetbrains.dokka.gradle.dokka
+
+plugins {
+    kotlin("multiplatform")
+    id("org.jetbrains.dokka")
+}
+
+apply(from = "../template.root.gradle.kts")
+
+kotlin {
+    jvm()
+    linuxX64("linux")
+    macosX64("macos")
+    js()
+}
+
+dokka {
+    dokkaSourceSets {
+        create("commonMain")
+        create("jvmMain")
+        create("linuxMain")
+        create("macosMain")
+        create("jsMain")
+    }
+}
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/gradle.properties b/integration-tests/gradle/projects/it-multiplatform-0/gradle.properties
new file mode 100644
index 00000000..7ebac3ad
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/gradle.properties
@@ -0,0 +1 @@
+dokka_it_kotlin_version=1.3.72
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/gradle/wrapper/gradle-wrapper.jar b/integration-tests/gradle/projects/it-multiplatform-0/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000..f3d88b1c
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/gradle/wrapper/gradle-wrapper.jar
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/gradle/wrapper/gradle-wrapper.properties b/integration-tests/gradle/projects/it-multiplatform-0/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..1b16c34a
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/gradlew b/integration-tests/gradle/projects/it-multiplatform-0/gradlew
new file mode 100755
index 00000000..2fe81a7d
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/gradlew
@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/gradlew.bat b/integration-tests/gradle/projects/it-multiplatform-0/gradlew.bat
new file mode 100644
index 00000000..24467a14
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/gradlew.bat
@@ -0,0 +1,100 @@
+@rem

+@rem Copyright 2015 the original author or authors.

+@rem

+@rem Licensed under the Apache License, Version 2.0 (the "License");

+@rem you may not use this file except in compliance with the License.

+@rem You may obtain a copy of the License at

+@rem

+@rem      https://www.apache.org/licenses/LICENSE-2.0

+@rem

+@rem Unless required by applicable law or agreed to in writing, software

+@rem distributed under the License is distributed on an "AS IS" BASIS,

+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+@rem See the License for the specific language governing permissions and

+@rem limitations under the License.

+@rem

+

+@if "%DEBUG%" == "" @echo off

+@rem ##########################################################################

+@rem

+@rem  Gradle startup script for Windows

+@rem

+@rem ##########################################################################

+

+@rem Set local scope for the variables with windows NT shell

+if "%OS%"=="Windows_NT" setlocal

+

+set DIRNAME=%~dp0

+if "%DIRNAME%" == "" set DIRNAME=.

+set APP_BASE_NAME=%~n0

+set APP_HOME=%DIRNAME%

+

+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.

+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

+

+@rem Find java.exe

+if defined JAVA_HOME goto findJavaFromJavaHome

+

+set JAVA_EXE=java.exe

+%JAVA_EXE% -version >NUL 2>&1

+if "%ERRORLEVEL%" == "0" goto init

+

+echo.

+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:findJavaFromJavaHome

+set JAVA_HOME=%JAVA_HOME:"=%

+set JAVA_EXE=%JAVA_HOME%/bin/java.exe

+

+if exist "%JAVA_EXE%" goto init

+

+echo.

+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:init

+@rem Get command-line arguments, handling Windows variants

+

+if not "%OS%" == "Windows_NT" goto win9xME_args

+

+:win9xME_args

+@rem Slurp the command line arguments.

+set CMD_LINE_ARGS=

+set _SKIP=2

+

+:win9xME_args_slurp

+if "x%~1" == "x" goto execute

+

+set CMD_LINE_ARGS=%*

+

+:execute

+@rem Setup the command line

+

+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar

+

+@rem Execute Gradle

+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%

+

+:end

+@rem End local scope for the variables with windows NT shell

+if "%ERRORLEVEL%"=="0" goto mainEnd

+

+:fail

+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of

+rem the _cmd.exe /c_ return code!

+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1

+exit /b 1

+

+:mainEnd

+if "%OS%"=="Windows_NT" endlocal

+

+:omega

diff --git a/integration-tests/gradle/projects/it-multiplatform-0/settings.gradle.kts b/integration-tests/gradle/projects/it-multiplatform-0/settings.gradle.kts
new file mode 100644
index 00000000..1894bed8
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/settings.gradle.kts
@@ -0,0 +1,2 @@
+apply(from = "../template.settings.gradle.kts")
+rootProject.name = "it-multiplatform-0"
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/src/commonMain/kotlin/it/mpp0/CommonMainClass.kt b/integration-tests/gradle/projects/it-multiplatform-0/src/commonMain/kotlin/it/mpp0/CommonMainClass.kt
new file mode 100644
index 00000000..499a4f1e
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/src/commonMain/kotlin/it/mpp0/CommonMainClass.kt
@@ -0,0 +1,8 @@
+package it.mpp0
+
+/**
+ * This class is defined in commonMain
+ */
+class CommonMainClass {
+    fun publicFunction(): String = "public"
+}
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/src/commonMain/kotlin/it/mpp0/ExpectedClass.kt b/integration-tests/gradle/projects/it-multiplatform-0/src/commonMain/kotlin/it/mpp0/ExpectedClass.kt
new file mode 100644
index 00000000..e610b09a
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/src/commonMain/kotlin/it/mpp0/ExpectedClass.kt
@@ -0,0 +1,5 @@
+package it.mpp0
+
+expect class ExpectedClass {
+    val platform: String
+}
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/src/jsMain/kotlin/it/mpp0/ExpectedClass.kt b/integration-tests/gradle/projects/it-multiplatform-0/src/jsMain/kotlin/it/mpp0/ExpectedClass.kt
new file mode 100644
index 00000000..1e4a6d22
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/src/jsMain/kotlin/it/mpp0/ExpectedClass.kt
@@ -0,0 +1,5 @@
+package it.mpp0
+
+actual class ExpectedClass {
+    actual val platform: String = "js"
+}
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/src/jvmMain/kotlin/it/mpp0/ExpectedClass.kt b/integration-tests/gradle/projects/it-multiplatform-0/src/jvmMain/kotlin/it/mpp0/ExpectedClass.kt
new file mode 100644
index 00000000..8e7fa96e
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/src/jvmMain/kotlin/it/mpp0/ExpectedClass.kt
@@ -0,0 +1,5 @@
+package it.mpp0
+
+actual class ExpectedClass {
+    actual val platform: String = "jvm"
+}
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/src/linuxMain/kotlin/it/mpp0/ExpectedClass.kt b/integration-tests/gradle/projects/it-multiplatform-0/src/linuxMain/kotlin/it/mpp0/ExpectedClass.kt
new file mode 100644
index 00000000..19070a96
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/src/linuxMain/kotlin/it/mpp0/ExpectedClass.kt
@@ -0,0 +1,5 @@
+package it.mpp0
+
+actual class ExpectedClass {
+    actual val platform: String = "linux"
+}
diff --git a/integration-tests/gradle/projects/it-multiplatform-0/src/macosMain/kotlin/it/mpp0/ExpectedClass.kt b/integration-tests/gradle/projects/it-multiplatform-0/src/macosMain/kotlin/it/mpp0/ExpectedClass.kt
new file mode 100644
index 00000000..7a4a8f75
--- /dev/null
+++ b/integration-tests/gradle/projects/it-multiplatform-0/src/macosMain/kotlin/it/mpp0/ExpectedClass.kt
@@ -0,0 +1,5 @@
+package it.mpp0
+
+actual class ExpectedClass {
+    actual val platform: String = "macos"
+}
diff --git a/integration-tests/gradle/projects/template.root.gradle.kts b/integration-tests/gradle/projects/template.root.gradle.kts
index 02e6c715..1285375d 100644
--- a/integration-tests/gradle/projects/template.root.gradle.kts
+++ b/integration-tests/gradle/projects/template.root.gradle.kts
@@ -1,8 +1,10 @@
-repositories {
-    maven("https://dl.bintray.com/kotlin/kotlin-dev/")
-    jcenter()
-    mavenLocal()
-    mavenCentral()
+allprojects {
+    repositories {
+        maven("https://dl.bintray.com/kotlin/kotlin-dev/")
+        jcenter()
+        mavenLocal()
+        mavenCentral()
+    }
 }
 
 afterEvaluate {
diff --git a/integration-tests/gradle/projects/template.settings.gradle.kts b/integration-tests/gradle/projects/template.settings.gradle.kts
index faee1f18..f28de32a 100644
--- a/integration-tests/gradle/projects/template.settings.gradle.kts
+++ b/integration-tests/gradle/projects/template.settings.gradle.kts
@@ -5,6 +5,7 @@ pluginManagement {
 
     plugins {
         id("org.jetbrains.kotlin.jvm") version dokka_it_kotlin_version
+        id("org.jetbrains.kotlin.multiplatform") version dokka_it_kotlin_version
     }
 
     resolutionStrategy {
diff --git a/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractDefaultVersionsGradleIntegrationTest.kt b/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractDefaultVersionsGradleIntegrationTest.kt
index b7f44a4c..80737129 100644
--- a/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractDefaultVersionsGradleIntegrationTest.kt
+++ b/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractDefaultVersionsGradleIntegrationTest.kt
@@ -1,14 +1,30 @@
 package org.jetbrains.dokka.it.gradle
 
+import org.gradle.util.GradleVersion
+import org.junit.Assume
 import org.junit.Test
 
-abstract class AbstractDefaultVersionsGradleIntegrationTest : AbstractGradleIntegrationTest() {
+abstract class AbstractDefaultVersionsGradleIntegrationTest(
+    private val minGradleVersion: GradleVersion? = null,
+    private val maxGradleVersion: GradleVersion? = null
+) : AbstractGradleIntegrationTest() {
 
     protected abstract fun execute(versions: BuildVersions)
 
+    private fun executeIfRequirementsAreMet(versions: BuildVersions) {
+        if (minGradleVersion != null) {
+            Assume.assumeTrue(versions.gradleVersion >= minGradleVersion)
+        }
+        if (maxGradleVersion != null) {
+            Assume.assumeTrue(versions.gradleVersion <= maxGradleVersion)
+        }
+
+        execute(versions )
+    }
+
     @Test
-    fun `gradle 5_6_4 kotlin 1_3_72`() {
-        execute(
+    open fun `gradle 5_6_4 kotlin 1_3_72`() {
+        executeIfRequirementsAreMet(
             BuildVersions(
                 gradleVersion = "5.6.4",
                 kotlinVersion = "1.3.72"
@@ -17,8 +33,8 @@ abstract class AbstractDefaultVersionsGradleIntegrationTest : AbstractGradleInte
     }
 
     @Test
-    fun `gradle 5_6_4 kotlin 1_3_30`() {
-        execute(
+    open fun `gradle 5_6_4 kotlin 1_3_30`() {
+        executeIfRequirementsAreMet(
             BuildVersions(
                 gradleVersion = "5.6.4",
                 kotlinVersion = "1.3.30"
@@ -27,8 +43,8 @@ abstract class AbstractDefaultVersionsGradleIntegrationTest : AbstractGradleInte
     }
 
     @Test
-    fun `gradle 5_6_4 kotlin 1_4_M2_eap_70`() {
-        execute(
+    open fun `gradle 5_6_4 kotlin 1_4_M2_eap_70`() {
+        executeIfRequirementsAreMet(
             BuildVersions(
                 gradleVersion = "5.6.4",
                 kotlinVersion = "1.4-M2-eap-70"
@@ -37,8 +53,8 @@ abstract class AbstractDefaultVersionsGradleIntegrationTest : AbstractGradleInte
     }
 
     @Test
-    fun `gradle 6_1_1 kotlin 1_3_72`() {
-        execute(
+    open fun `gradle 6_1_1 kotlin 1_3_72`() {
+        executeIfRequirementsAreMet(
             BuildVersions(
                 gradleVersion = "6.1.1",
                 kotlinVersion = "1.3.72"
@@ -47,8 +63,8 @@ abstract class AbstractDefaultVersionsGradleIntegrationTest : AbstractGradleInte
     }
 
     @Test
-    fun `gradle 6_5_1 kotlin 1_4_M2_eap_70`() {
-        execute(
+    open fun `gradle 6_5_1 kotlin 1_4_M2_eap_70`() {
+        executeIfRequirementsAreMet(
             BuildVersions(
                 gradleVersion = "6.5.1",
                 kotlinVersion = "1.4-M2-eap-70"
@@ -57,8 +73,8 @@ abstract class AbstractDefaultVersionsGradleIntegrationTest : AbstractGradleInte
     }
 
     @Test
-    fun `gradle 6_5_1 kotlin 1_3_72`() {
-        execute(
+    open fun `gradle 6_5_1 kotlin 1_3_72`() {
+        executeIfRequirementsAreMet(
             BuildVersions(
                 gradleVersion = "6.5.1",
                 kotlinVersion = "1.3.72"
diff --git a/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractGradleIntegrationTest.kt b/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractGradleIntegrationTest.kt
index 2efb9c55..e6b6b0eb 100644
--- a/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractGradleIntegrationTest.kt
+++ b/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/AbstractGradleIntegrationTest.kt
@@ -29,7 +29,7 @@ abstract class AbstractGradleIntegrationTest {
     ): GradleRunner {
         return GradleRunner.create()
             .withProjectDir(projectDir)
-            .withGradleVersion(buildVersions.gradleVersion)
+            .withGradleVersion(buildVersions.gradleVersion.version)
             .forwardOutput()
             .withArguments(
                 "-Pkotlin_version=${buildVersions.kotlinVersion}",
@@ -40,6 +40,14 @@ abstract class AbstractGradleIntegrationTest {
 
     }
 
+    fun File.allDescendentsWithExtension(extension: String): Sequence<File> {
+        return this.walkTopDown().filter { it.isFile && it.extension == extension }
+    }
+
+    fun File.allHtmlFiles(): Sequence<File> {
+        return allDescendentsWithExtension("html")
+    }
+
     protected fun assertContainsNoErrorClass(file: File) {
         val fileText = file.readText()
         assertFalse(
diff --git a/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/BuildVersions.kt b/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/BuildVersions.kt
index 6aa41e7a..2fdd0368 100644
--- a/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/BuildVersions.kt
+++ b/integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/BuildVersions.kt
@@ -1,6 +1,16 @@
 package org.jetbrains.dokka.it.gradle
 
+import org.gradle.util.GradleVersion
+
 data class BuildVersions(
-    val gradleVersion: String,
+    val gradleVersion: GradleVersion,
     val kotlinVersion: String
-)
+) {
+    constructor(
+        gradleVersion: String,
+        kotlinVersion: String
+    ) : this(
+        gradleVersion = GradleVersion.version(gradleVersion),
+        kotlinVersion = kotlinVersion
+    )
+}
diff --git a/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/BasicGradleIntegrationTest.kt b/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/BasicGradleIntegrationTest.kt
index b697f2a1..b4d9e82c 100644
--- a/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/BasicGradleIntegrationTest.kt
+++ b/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/BasicGradleIntegrationTest.kt
@@ -54,11 +54,9 @@ class BasicGradleIntegrationTest : AbstractDefaultVersionsGradleIntegrationTest(
         val moduleJavaPackageDir = File(moduleOutputDir, "it.basic.java")
         assertTrue(moduleJavaPackageDir.isDirectory, "Missing it.basic.java package directory")
 
-        dokkaOutputDir.walkTopDown()
-            .filter { file -> file.extension == "html" }
-            .forEach { file ->
-                assertContainsNoErrorClass(file)
-                assertNoUnresolvedLInks(file)
-            }
+        dokkaOutputDir.allHtmlFiles().forEach { file ->
+            assertContainsNoErrorClass(file)
+            assertNoUnresolvedLInks(file)
+        }
     }
 }
diff --git a/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/Multiplatform0GradleIntegrationTest.kt b/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/Multiplatform0GradleIntegrationTest.kt
new file mode 100644
index 00000000..a0f6be24
--- /dev/null
+++ b/integration-tests/gradle/src/test/kotlin/org/jetbrains/dokka/it/gradle/Multiplatform0GradleIntegrationTest.kt
@@ -0,0 +1,41 @@
+package org.jetbrains.dokka.it.gradle
+
+import org.gradle.testkit.runner.TaskOutcome
+import org.gradle.util.GradleVersion
+import java.io.File
+import kotlin.test.BeforeTest
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+class Multiplatform0GradleIntegrationTest : AbstractDefaultVersionsGradleIntegrationTest(
+    minGradleVersion = GradleVersion.version("6.0.0")
+) {
+
+    @BeforeTest
+    fun prepareProjectFiles() {
+        val templateProjectDir = File("projects", "it-multiplatform-0")
+        templateProjectDir.listFiles().orEmpty()
+            .filter { it.isFile }
+            .forEach { topLevelFile -> topLevelFile.copyTo(File(projectDir, topLevelFile.name)) }
+        File(templateProjectDir, "src").copyRecursively(File(projectDir, "src"))
+    }
+
+    override fun execute(versions: BuildVersions) {
+        val result = createGradleRunner(
+            buildVersions = versions,
+            arguments = arrayOf("dokka", "--stacktrace")
+        ).build()
+
+        assertEquals(TaskOutcome.SUCCESS, assertNotNull(result.task(":dokka")).outcome)
+
+        val dokkaOutputDir = File(projectDir, "build/dokka")
+        assertTrue(dokkaOutputDir.isDirectory, "Missing dokka output directory")
+
+        dokkaOutputDir.allHtmlFiles().forEach { file ->
+            assertContainsNoErrorClass(file)
+            assertNoUnresolvedLInks(file)
+        }
+    }
+
+}