test: Add sack util test

13 files changed, 425 insertions, 269 deletions

diff --git a/build.gradle.kts b/build.gradle.kts
index 7887641..53b0b87 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -7,6 +7,8 @@
  */
 
 import com.google.devtools.ksp.gradle.KspTaskJvm
+import com.google.gson.Gson
+import com.google.gson.JsonObject
 import moe.nea.licenseextractificator.LicenseDiscoveryTask
 import moe.nea.mcautotranslations.gradle.CollectTranslations
 import net.fabricmc.loom.LoomGradleExtension
@@ -219,7 +221,8 @@ val configuredSourceSet = createIsolatedSourceSet("configured",
 val sodiumSourceSet = createIsolatedSourceSet("sodium")
 val citResewnSourceSet = createIsolatedSourceSet("citresewn", isEnabled = false) // TODO: Wait for update
 val yaclSourceSet = createIsolatedSourceSet("yacl")
-val explosiveEnhancementSourceSet = createIsolatedSourceSet("explosiveEnhancement", isEnabled = false) // TODO: wait for their port
+val explosiveEnhancementSourceSet =
+	createIsolatedSourceSet("explosiveEnhancement", isEnabled = false) // TODO: wait for their port
 val wildfireGenderSourceSet = createIsolatedSourceSet("wildfireGender", isEnabled = false) // TODO: wait on their port
 val modmenuSourceSet = createIsolatedSourceSet("modmenu")
 val reiSourceSet = createIsolatedSourceSet("rei")
@@ -344,7 +347,35 @@ mcAutoTranslations {
 	translationFunctionResolved.set("moe.nea.firmament.util.trResolved")
 }
 
+val downloadTestRepo by tasks.registering(RepoDownload::class) {
+	this.hash.set(project.property("firmament.compiletimerepohash") as String)
+}
+
+val updateTestRepo by tasks.registering {
+	outputs.upToDateWhen { false }
+	doLast {
+		val propertiesFile = rootProject.file("gradle.properties")
+		val json =
+			Gson().fromJson(uri("https://api.github.com/repos/NotEnoughUpdates/NotEnoughUpdates-REPO/branches/master")
+				                .toURL().readText(), JsonObject::class.java)
+		val latestSha = json["commit"].asJsonObject["sha"].asString
+		var text = propertiesFile.readText()
+		text = text.replace("firmament\\.compiletimerepohash=[^\n]*".toRegex(),
+		                    "firmament.compiletimerepohash=$latestSha")
+		propertiesFile.writeText(text)
+	}
+}
+
+
 tasks.test {
+	val wd =file("build/testWorkDir")
+	workingDir(wd)
+	dependsOn(downloadTestRepo)
+	doFirst {
+		wd.mkdirs()
+		wd.resolve("config").deleteRecursively()
+		systemProperty("firmament.testrepo", downloadTestRepo.flatMap { it.outputDirectory.asFile }.map { it.absolutePath }.get())
+	}
 	useJUnitPlatform()
 }
 
diff --git a/buildSrc/src/RepoDownload.kt b/buildSrc/src/RepoDownload.kt
new file mode 100644
index 0000000..42a09b3
--- /dev/null
+++ b/buildSrc/src/RepoDownload.kt
@@ -0,0 +1,41 @@
+import java.net.URI
+import java.util.zip.ZipInputStream
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputDirectory
+import org.gradle.api.tasks.TaskAction
+
+abstract class RepoDownload : DefaultTask() {
+	@get:Input
+	abstract val hash: Property<String>
+
+	@get:OutputDirectory
+	abstract val outputDirectory: DirectoryProperty
+
+	init {
+		outputDirectory.convention(project.layout.buildDirectory.dir("extracted-test-repo"))
+	}
+
+	@TaskAction
+	fun performDownload() {
+		val outputDir = outputDirectory.asFile.get().absoluteFile
+		outputDir.mkdirs()
+		URI("https://github.com/notEnoughUpdates/notEnoughUpdates-rEPO/archive/${hash.get()}.zip").toURL().openStream()
+			.let(::ZipInputStream)
+			.use { zipInput ->
+				while (true) {
+					val entry = zipInput.nextEntry ?: break
+					val destination = outputDir.resolve(
+						entry.name.substringAfter('/')).absoluteFile
+					require(outputDir in generateSequence(destination) { it.parentFile })
+					if (entry.isDirectory) continue
+					destination.parentFile.mkdirs()
+					destination.outputStream().use { output ->
+						zipInput.copyTo(output)
+					}
+				}
+			}
+	}
+}
diff --git a/gradle.properties b/gradle.properties
index abca2cd..ec779d5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
+# SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
 #
 # SPDX-License-Identifier: CC0-1.0
 # suppress inspection "UnusedProperty" for whole file
@@ -9,3 +9,4 @@ loom.platform=fabric
 archives_base_name=Firmament
 maven_group=moe.nea.firmament
 
+firmament.compiletimerepohash=a6116d945491d7c57c93d43f51250f93d62d8434
diff --git a/src/main/kotlin/features/diana/AncestralSpadeSolver.kt b/src/main/kotlin/features/diana/AncestralSpadeSolver.kt
index 8918e66..ff85c00 100644
--- a/src/main/kotlin/features/diana/AncestralSpadeSolver.kt
+++ b/src/main/kotlin/features/diana/AncestralSpadeSolver.kt
@@ -20,6 +20,7 @@ import moe.nea.firmament.util.TimeMark
 import moe.nea.firmament.util.WarpUtil
 import moe.nea.firmament.util.render.RenderInWorldContext
 import moe.nea.firmament.util.skyBlockId
+import moe.nea.firmament.util.skyblock.SkyBlockItems
 
 object AncestralSpadeSolver : SubscriptionOwner {
 	var lastDing = TimeMark.farPast()
@@ -29,13 +30,12 @@ object AncestralSpadeSolver : SubscriptionOwner {
 	var nextGuess: Vec3d? = null
 		private set
 
-	val ancestralSpadeId = SkyblockId("ANCESTRAL_SPADE")
 	private var lastTeleportAttempt = TimeMark.farPast()
 
 	fun isEnabled() =
 		DianaWaypoints.TConfig.ancestralSpadeSolver
 			&& SBData.skyblockLocation == SkyBlockIsland.HUB
-			&& MC.player?.inventory?.containsAny { it.skyBlockId == ancestralSpadeId } == true // TODO: add a reactive property here
+			&& MC.player?.inventory?.containsAny { it.skyBlockId == SkyBlockItems.ANCESTRAL_SPADE } == true // TODO: add a reactive property here
 
 	@Subscribe
 	fun onKeyBind(event: WorldKeyboardEvent) {
diff --git a/src/main/kotlin/repo/ItemCache.kt b/src/main/kotlin/repo/ItemCache.kt
index c86934c..6fb2ab8 100644
--- a/src/main/kotlin/repo/ItemCache.kt
+++ b/src/main/kotlin/repo/ItemCache.kt
@@ -1,5 +1,3 @@
-
-
 package moe.nea.firmament.repo
 
 import com.mojang.serialization.Dynamic
@@ -30,186 +28,194 @@ import moe.nea.firmament.Firmament
 import moe.nea.firmament.gui.config.HudMeta
 import moe.nea.firmament.gui.config.HudPosition
 import moe.nea.firmament.gui.hud.MoulConfigHud
+import moe.nea.firmament.repo.RepoManager.initialize
 import moe.nea.firmament.util.LegacyTagParser
 import moe.nea.firmament.util.MC
 import moe.nea.firmament.util.SkyblockId
+import moe.nea.firmament.util.TestUtil
 import moe.nea.firmament.util.mc.appendLore
+import moe.nea.firmament.util.mc.modifyLore
 import moe.nea.firmament.util.mc.setCustomName
 import moe.nea.firmament.util.mc.setSkullOwner
-import moe.nea.firmament.util.mc.modifyLore
 import moe.nea.firmament.util.skyblockId
 
 object ItemCache : IReloadable {
-    private val cache: MutableMap<String, ItemStack> = ConcurrentHashMap()
-    private val df = Schemas.getFixer()
-    val logger = LogManager.getLogger("${Firmament.logger.name}.ItemCache")
-    var isFlawless = true
-        private set
-
-    private fun NEUItem.get10809CompoundTag(): NbtCompound = NbtCompound().apply {
-        put("tag", LegacyTagParser.parse(nbttag))
-        putString("id", minecraftItemId)
-        putByte("Count", 1)
-        putShort("Damage", damage.toShort())
-    }
-
-    private fun NbtCompound.transformFrom10809ToModern(): NbtCompound? =
-        try {
-            df.update(
-                TypeReferences.ITEM_STACK,
-                Dynamic(NbtOps.INSTANCE, this),
-                -1,
-                SharedConstants.getGameVersion().saveVersion.id
-            ).value as NbtCompound
-        } catch (e: Exception) {
-            isFlawless = false
-            logger.error("Could not data fix up $this", e)
-            null
-        }
-
-    fun brokenItemStack(neuItem: NEUItem?, idHint: SkyblockId? = null): ItemStack {
-        return ItemStack(Items.PAINTING).apply {
-            setCustomName(Text.literal(neuItem?.displayName ?: idHint?.neuItem ?: "null"))
-            appendLore(
-                listOf(
-                    Text.stringifiedTranslatable(
-                        "firmament.repo.brokenitem",
-                        (neuItem?.skyblockItemId ?: idHint)
-                    )
-                )
-            )
-        }
-    }
-
-    private fun NEUItem.asItemStackNow(): ItemStack {
-        try {
-            val oldItemTag = get10809CompoundTag()
-            val modernItemTag = oldItemTag.transformFrom10809ToModern()
-                ?: return brokenItemStack(this)
-            val itemInstance =
-                ItemStack.fromNbt(MC.defaultRegistries, modernItemTag).getOrNull() ?: return brokenItemStack(this)
-            val extraAttributes = oldItemTag.getCompound("tag").getCompound("ExtraAttributes")
-            if (extraAttributes != null)
-                itemInstance.set(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(extraAttributes))
-            return itemInstance
-        } catch (e: Exception) {
-            e.printStackTrace()
-            return brokenItemStack(this)
-        }
-    }
-
-    fun NEUItem?.asItemStack(idHint: SkyblockId? = null, loreReplacements: Map<String, String>? = null): ItemStack {
-        if (this == null) return brokenItemStack(null, idHint)
-        var s = cache[this.skyblockItemId]
-        if (s == null) {
-            s = asItemStackNow()
-            cache[this.skyblockItemId] = s
-        }
-        if (!loreReplacements.isNullOrEmpty()) {
-            s = s.copy()!!
-            s.applyLoreReplacements(loreReplacements)
-            s.setCustomName(s.name.applyLoreReplacements(loreReplacements))
-        }
-        return s
-    }
-
-    fun ItemStack.applyLoreReplacements(loreReplacements: Map<String, String>) {
-        modifyLore { lore ->
-            lore.map {
-                it.applyLoreReplacements(loreReplacements)
-            }
-        }
-    }
-
-    fun Text.applyLoreReplacements(loreReplacements: Map<String, String>): Text {
-        assert(this.siblings.isEmpty())
-        var string = this.string
-        loreReplacements.forEach { (find, replace) ->
-            string = string.replace("{$find}", replace)
-        }
-        return Text.literal(string).styled { this.style }
-    }
-
-    fun NEUItem.getIdentifier() = skyblockId.identifier
-
-    var job: Job? = null
-    object ReloadProgressHud : MoulConfigHud(
-        "repo_reload", HudMeta(HudPosition(0.0, 0.0, 1F), Text.literal("Repo Reload"), 180, 18)) {
-
-
-        var isEnabled = false
-        override fun shouldRender(): Boolean {
-            return isEnabled
-        }
-
-        @get:Bind("current")
-        var current: Double = 0.0
-
-        @get:Bind("label")
-        var label: String = ""
-
-        @get:Bind("max")
-        var max: Double = 0.0
-
-        fun reportProgress(label: String, current: Int, max: Int) {
-            this.label = label
-            this.current = current.toDouble()
-            this.max = max.toDouble()
-        }
-    }
-
-    override fun reload(repository: NEURepository) {
-        val j = job
-        if (j != null && j.isActive) {
-            j.cancel()
-        }
-        cache.clear()
-        isFlawless = true
-
-        job = Firmament.coroutineScope.launch {
-            val items = repository.items?.items
-            if (items == null) {
-                ReloadProgressHud.isEnabled = false
-                return@launch
-            }
-            val recacheItems = I18n.translate("firmament.repo.cache")
-            ReloadProgressHud.reportProgress(recacheItems, 0, items.size)
-            ReloadProgressHud.isEnabled = true
-            var i = 0
-            items.values.forEach {
-                it.asItemStack() // Rebuild cache
-                ReloadProgressHud.reportProgress(recacheItems, i++, items.size)
-            }
-            ReloadProgressHud.isEnabled = false
-        }
-    }
-
-    fun coinItem(coinAmount: Int): ItemStack {
-        var uuid = UUID.fromString("2070f6cb-f5db-367a-acd0-64d39a7e5d1b")
-        var texture =
-            "http://textures.minecraft.net/texture/538071721cc5b4cd406ce431a13f86083a8973e1064d2f8897869930ee6e5237"
-        if (coinAmount >= 100000) {
-            uuid = UUID.fromString("94fa2455-2881-31fe-bb4e-e3e24d58dbe3")
-            texture =
-                "http://textures.minecraft.net/texture/c9b77999fed3a2758bfeaf0793e52283817bea64044bf43ef29433f954bb52f6"
-        }
-        if (coinAmount >= 10000000) {
-            uuid = UUID.fromString("0af8df1f-098c-3b72-ac6b-65d65fd0b668")
-            texture =
-                "http://textures.minecraft.net/texture/7b951fed6a7b2cbc2036916dec7a46c4a56481564d14f945b6ebc03382766d3b"
-        }
-        val itemStack = ItemStack(Items.PLAYER_HEAD)
-        itemStack.setCustomName(Text.literal("§r§6" + NumberFormat.getInstance().format(coinAmount) + " Coins"))
-        itemStack.setSkullOwner(uuid, texture)
-        return itemStack
-    }
+	private val cache: MutableMap<String, ItemStack> = ConcurrentHashMap()
+	private val df = Schemas.getFixer()
+	val logger = LogManager.getLogger("${Firmament.logger.name}.ItemCache")
+	var isFlawless = true
+		private set
+
+	private fun NEUItem.get10809CompoundTag(): NbtCompound = NbtCompound().apply {
+		put("tag", LegacyTagParser.parse(nbttag))
+		putString("id", minecraftItemId)
+		putByte("Count", 1)
+		putShort("Damage", damage.toShort())
+	}
+
+	private fun NbtCompound.transformFrom10809ToModern(): NbtCompound? =
+		try {
+			df.update(
+				TypeReferences.ITEM_STACK,
+				Dynamic(NbtOps.INSTANCE, this),
+				-1,
+				SharedConstants.getGameVersion().saveVersion.id
+			).value as NbtCompound
+		} catch (e: Exception) {
+			isFlawless = false
+			logger.error("Could not data fix up $this", e)
+			null
+		}
+
+	fun brokenItemStack(neuItem: NEUItem?, idHint: SkyblockId? = null): ItemStack {
+		return ItemStack(Items.PAINTING).apply {
+			setCustomName(Text.literal(neuItem?.displayName ?: idHint?.neuItem ?: "null"))
+			appendLore(
+				listOf(
+					Text.stringifiedTranslatable(
+						"firmament.repo.brokenitem",
+						(neuItem?.skyblockItemId ?: idHint)
+					)
+				)
+			)
+		}
+	}
+
+	private fun NEUItem.asItemStackNow(): ItemStack {
+		try {
+			val oldItemTag = get10809CompoundTag()
+			val modernItemTag = oldItemTag.transformFrom10809ToModern()
+				?: return brokenItemStack(this)
+			val itemInstance =
+				ItemStack.fromNbt(MC.defaultRegistries, modernItemTag).getOrNull() ?: return brokenItemStack(this)
+			val extraAttributes = oldItemTag.getCompound("tag").getCompound("ExtraAttributes")
+			if (extraAttributes != null)
+				itemInstance.set(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(extraAttributes))
+			return itemInstance
+		} catch (e: Exception) {
+			e.printStackTrace()
+			return brokenItemStack(this)
+		}
+	}
+
+	fun NEUItem?.asItemStack(idHint: SkyblockId? = null, loreReplacements: Map<String, String>? = null): ItemStack {
+		if (this == null) return brokenItemStack(null, idHint)
+		var s = cache[this.skyblockItemId]
+		if (s == null) {
+			s = asItemStackNow()
+			cache[this.skyblockItemId] = s
+		}
+		if (!loreReplacements.isNullOrEmpty()) {
+			s = s.copy()!!
+			s.applyLoreReplacements(loreReplacements)
+			s.setCustomName(s.name.applyLoreReplacements(loreReplacements))
+		}
+		return s
+	}
+
+	fun ItemStack.applyLoreReplacements(loreReplacements: Map<String, String>) {
+		modifyLore { lore ->
+			lore.map {
+				it.applyLoreReplacements(loreReplacements)
+			}
+		}
+	}
+
+	fun Text.applyLoreReplacements(loreReplacements: Map<String, String>): Text {
+		assert(this.siblings.isEmpty())
+		var string = this.string
+		loreReplacements.forEach { (find, replace) ->
+			string = string.replace("{$find}", replace)
+		}
+		return Text.literal(string).styled { this.style }
+	}
+
+	var job: Job? = null
+
+	object ReloadProgressHud : MoulConfigHud(
+		"repo_reload", HudMeta(HudPosition(0.0, 0.0, 1F), Text.literal("Repo Reload"), 180, 18)) {
+
+
+		var isEnabled = false
+		override fun shouldRender(): Boolean {
+			return isEnabled
+		}
+
+		@get:Bind("current")
+		var current: Double = 0.0
+
+		@get:Bind("label")
+		var label: String = ""
+
+		@get:Bind("max")
+		var max: Double = 0.0
+
+		fun reportProgress(label: String, current: Int, max: Int) {
+			this.label = label
+			this.current = current.toDouble()
+			this.max = max.toDouble()
+		}
+	}
+
+	override fun reload(repository: NEURepository) {
+		val j = job
+		if (j != null && j.isActive) {
+			j.cancel()
+		}
+		cache.clear()
+		isFlawless = true
+		if (TestUtil.isInTest) return
+		job = Firmament.coroutineScope.launch {
+			val items = repository.items?.items
+			if (items == null) {
+				ReloadProgressHud.isEnabled = false
+				return@launch
+			}
+			val recacheItems = I18n.translate("firmament.repo.cache")
+			ReloadProgressHud.reportProgress(recacheItems, 0, items.size)
+			ReloadProgressHud.isEnabled = true
+			var i = 0
+			items.values.forEach {
+				it.asItemStack() // Rebuild cache
+				ReloadProgressHud.reportProgress(recacheItems, i++, items.size)
+			}
+			ReloadProgressHud.isEnabled = false
+		}
+	}
+
+	fun coinItem(coinAmount: Int): ItemStack {
+		var uuid = UUID.fromString("2070f6cb-f5db-367a-acd0-64d39a7e5d1b")
+		var texture =
+			"http://textures.minecraft.net/texture/538071721cc5b4cd406ce431a13f86083a8973e1064d2f8897869930ee6e5237"
+		if (coinAmount >= 100000) {
+			uuid = UUID.fromString("94fa2455-2881-31fe-bb4e-e3e24d58dbe3")
+			texture =
+				"http://textures.minecraft.net/texture/c9b77999fed3a2758bfeaf0793e52283817bea64044bf43ef29433f954bb52f6"
+		}
+		if (coinAmount >= 10000000) {
+			uuid = UUID.fromString("0af8df1f-098c-3b72-ac6b-65d65fd0b668")
+			texture =
+				"http://textures.minecraft.net/texture/7b951fed6a7b2cbc2036916dec7a46c4a56481564d14f945b6ebc03382766d3b"
+		}
+		val itemStack = ItemStack(Items.PLAYER_HEAD)
+		itemStack.setCustomName(Text.literal("§r§6" + NumberFormat.getInstance().format(coinAmount) + " Coins"))
+		itemStack.setSkullOwner(uuid, texture)
+		return itemStack
+	}
+
+	init {
+		if (TestUtil.isInTest) {
+			initialize()
+		}
+	}
+
 }
 
 
 operator fun NbtCompound.set(key: String, value: String) {
-    putString(key, value)
+	putString(key, value)
 }
 
 operator fun NbtCompound.set(key: String, value: NbtElement) {
-    put(key, value)
+	put(key, value)
 }
diff --git a/src/main/kotlin/repo/ItemNameLookup.kt b/src/main/kotlin/repo/ItemNameLookup.kt
index 770de85..1250730 100644
--- a/src/main/kotlin/repo/ItemNameLookup.kt
+++ b/src/main/kotlin/repo/ItemNameLookup.kt
@@ -1,4 +1,3 @@
-
 package moe.nea.firmament.repo
 
 import io.github.moulberry.repo.IReloadable
@@ -12,87 +11,91 @@ import moe.nea.firmament.util.skyblockId
 
 object ItemNameLookup : IReloadable {
 
-    fun getItemNameChunks(name: String): Set<String> {
-        return name.removeColorCodes().split(" ").filterTo(mutableSetOf()) { it.isNotBlank() }
-    }
+	fun getItemNameChunks(name: String): Set<String> {
+		return name.removeColorCodes().split(" ").filterTo(mutableSetOf()) { it.isNotBlank() }
+	}
+
+	var nameMap: NavigableMap<String, out Set<SkyblockId>> = TreeMap()
 
-    var nameMap: NavigableMap<String, out Set<SkyblockId>> = TreeMap()
+	override fun reload(repository: NEURepository) {
+		val nameMap = TreeMap<String, MutableSet<SkyblockId>>()
+		repository.items.items.values.forEach { item ->
+			getAllNamesForItem(item).forEach { name ->
+				val chunks = getItemNameChunks(name)
+				chunks.forEach { chunk ->
+					val set = nameMap.getOrPut(chunk, ::mutableSetOf)
+					set.add(item.skyblockId)
+				}
+			}
+		}
+		this.nameMap = nameMap
+	}
 
-    override fun reload(repository: NEURepository) {
-        val nameMap = TreeMap<String, MutableSet<SkyblockId>>()
-        repository.items.items.values.forEach { item ->
-            getAllNamesForItem(item).forEach { name ->
-                val chunks = getItemNameChunks(name)
-                chunks.forEach { chunk ->
-                    val set = nameMap.getOrPut(chunk, ::mutableSetOf)
-                    set.add(item.skyblockId)
-                }
-            }
-        }
-        this.nameMap = nameMap
-    }
+	fun getAllNamesForItem(item: NEUItem): Set<String> {
+		val names = mutableSetOf<String>()
+		names.add(item.displayName)
+		if (item.displayName.contains("Enchanted Book")) {
+			val enchantName = item.lore.firstOrNull()
+			if (enchantName != null) {
+				names.add(enchantName)
+			}
+		}
+		return names
+	}
 
-    fun getAllNamesForItem(item: NEUItem): Set<String> {
-        val names = mutableSetOf<String>()
-        names.add(item.displayName)
-        if (item.displayName.contains("Enchanted Book")) {
-            val enchantName = item.lore.firstOrNull()
-            if (enchantName != null) {
-                names.add(enchantName)
-            }
-        }
-        return names
-    }
+	fun findItemCandidatesByName(name: String): MutableSet<SkyblockId> {
+		val candidates = mutableSetOf<SkyblockId>()
+		for (chunk in getItemNameChunks(name)) {
+			val set = nameMap[chunk] ?: emptySet()
+			candidates.addAll(set)
+		}
+		return candidates
+	}
 
-    fun findItemCandidatesByName(name: String): MutableSet<SkyblockId> {
-        val candidates = mutableSetOf<SkyblockId>()
-        for (chunk in getItemNameChunks(name)) {
-            val set = nameMap[chunk] ?: emptySet()
-            candidates.addAll(set)
-        }
-        return candidates
-    }
 
+	fun guessItemByName(
+		/**
+		 * The display name of the item. Color codes will be ignored.
+		 */
+		name: String,
+		/**
+		 * Whether the [name] may contain other text, such as reforges, master stars and such.
+		 */
+		mayBeMangled: Boolean
+	): SkyblockId? {
+		val cleanName = name.removeColorCodes()
+		return findBestItemFromCandidates(
+			findItemCandidatesByName(cleanName),
+			cleanName,
+			true
+		)
+	}
 
-    fun guessItemByName(
-        /**
-         * The display name of the item. Color codes will be ignored.
-         */
-        name: String,
-        /**
-         * Whether the [name] may contain other text, such as reforges, master stars and such.
-         */
-        mayBeMangled: Boolean
-    ): SkyblockId? {
-        val cleanName = name.removeColorCodes()
-        return findBestItemFromCandidates(
-            findItemCandidatesByName(cleanName),
-            cleanName,
-            true
-        )
-    }
+	fun findBestItemFromCandidates(
+		candidates: Iterable<SkyblockId>,
+		name: String, mayBeMangled: Boolean
+	): SkyblockId? {
+		val expectedClean = name.removeColorCodes()
+		var bestMatch: SkyblockId? = null
+		var bestMatchLength = -1
+		for (candidate in candidates) {
+			val item = RepoManager.getNEUItem(candidate) ?: continue
+			for (name in getAllNamesForItem(item)) {
+				val actualClean = name.removeColorCodes()
+				val matches = if (mayBeMangled) expectedClean == actualClean
+				else expectedClean.contains(actualClean)
+				if (!matches) continue
+				if (actualClean.length > bestMatchLength) {
+					bestMatch = candidate
+					bestMatchLength = actualClean.length
+				}
+			}
+		}
+		return bestMatch
+	}
 
-    fun findBestItemFromCandidates(
-        candidates: Iterable<SkyblockId>,
-        name: String, mayBeMangled: Boolean
-    ): SkyblockId? {
-        val expectedClean = name.removeColorCodes()
-        var bestMatch: SkyblockId? = null
-        var bestMatchLength = -1
-        for (candidate in candidates) {
-            val item = RepoManager.getNEUItem(candidate) ?: continue
-            for (name in getAllNamesForItem(item)) {
-                val actualClean = name.removeColorCodes()
-                val matches = if (mayBeMangled) expectedClean == actualClean
-                else expectedClean.contains(actualClean)
-                if (!matches) continue
-                if (actualClean.length > bestMatchLength) {
-                    bestMatch = candidate
-                    bestMatchLength = actualClean.length
-                }
-            }
-        }
-        return bestMatch
-    }
+	init {
+		RepoManager.initialize()
+	}
 
 }
diff --git a/src/main/kotlin/repo/RepoManager.kt b/src/main/kotlin/repo/RepoManager.kt
index 725642e..dc39511 100644
--- a/src/main/kotlin/repo/RepoManager.kt
+++ b/src/main/kotlin/repo/RepoManager.kt
@@ -5,6 +5,7 @@ import io.github.moulberry.repo.NEURepositoryException
 import io.github.moulberry.repo.data.NEUItem
 import io.github.moulberry.repo.data.NEURecipe
 import io.github.moulberry.repo.data.Rarity
+import java.nio.file.Path
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents
 import kotlinx.coroutines.launch
 import net.minecraft.client.MinecraftClient
@@ -14,9 +15,11 @@ import moe.nea.firmament.Firmament
 import moe.nea.firmament.Firmament.logger
 import moe.nea.firmament.events.ReloadRegistrationEvent
 import moe.nea.firmament.gui.config.ManagedConfig
+import moe.nea.firmament.util.ErrorUtil
 import moe.nea.firmament.util.MC
 import moe.nea.firmament.util.MinecraftDispatcher
 import moe.nea.firmament.util.SkyblockId
+import moe.nea.firmament.util.TestUtil
 import moe.nea.firmament.util.tr
 
 object RepoManager {
@@ -49,28 +52,31 @@ object RepoManager {
 
 	var recentlyFailedToUpdateItemList = false
 
-	val neuRepo: NEURepository = NEURepository.of(RepoDownloadManager.repoSavedLocation).apply {
-		registerReloadListener(ItemCache)
-		registerReloadListener(ExpLadders)
-		registerReloadListener(ItemNameLookup)
-		ReloadRegistrationEvent.publish(ReloadRegistrationEvent(this))
-		registerReloadListener {
-			Firmament.coroutineScope.launch(MinecraftDispatcher) {
-				if (!trySendClientboundUpdateRecipesPacket()) {
-					logger.warn("Failed to issue a ClientboundUpdateRecipesPacket (to reload REI). This may lead to an outdated item list.")
-					recentlyFailedToUpdateItemList = true
+	val essenceRecipeProvider = EssenceRecipeProvider()
+	val recipeCache = BetterRepoRecipeCache(essenceRecipeProvider)
+
+	fun makeNEURepository(path: Path): NEURepository {
+		return NEURepository.of(path).apply {
+			registerReloadListener(ItemCache)
+			registerReloadListener(ExpLadders)
+			registerReloadListener(ItemNameLookup)
+			ReloadRegistrationEvent.publish(ReloadRegistrationEvent(this))
+			registerReloadListener {
+				if (TestUtil.isInTest) return@registerReloadListener
+				Firmament.coroutineScope.launch(MinecraftDispatcher) {
+					if (!trySendClientboundUpdateRecipesPacket()) {
+						logger.warn("Failed to issue a ClientboundUpdateRecipesPacket (to reload REI). This may lead to an outdated item list.")
+						recentlyFailedToUpdateItemList = true
+					}
 				}
 			}
+			registerReloadListener(essenceRecipeProvider)
+			registerReloadListener(recipeCache)
 		}
 	}
 
-	val essenceRecipeProvider = EssenceRecipeProvider()
-	val recipeCache = BetterRepoRecipeCache(essenceRecipeProvider)
-
-	init {
-		neuRepo.registerReloadListener(essenceRecipeProvider)
-		neuRepo.registerReloadListener(recipeCache)
-	}
+	lateinit var neuRepo: NEURepository
+		private set
 
 	fun getAllRecipes() = neuRepo.items.items.values.asSequence().flatMap { it.recipes }
 
@@ -106,6 +112,11 @@ object RepoManager {
 		}
 	}
 
+	fun reloadForTest(from: Path) {
+		neuRepo = makeNEURepository(from)
+		reload()
+	}
+
 	fun reload() {
 		try {
 			ItemCache.ReloadProgressHud.reportProgress("Reloading from Disk",
@@ -114,16 +125,24 @@ object RepoManager {
 			ItemCache.ReloadProgressHud.isEnabled = true
 			neuRepo.reload()
 		} catch (exc: NEURepositoryException) {
+			ErrorUtil.softError("Failed to reload repository", exc)
 			MC.sendChat(
 				tr("firmament.repo.reloadfail",
 				   "Failed to reload repository. This will result in some mod features not working.")
 			)
 			ItemCache.ReloadProgressHud.isEnabled = false
-			exc.printStackTrace()
 		}
 	}
 
+	private var wasInitialized = false
 	fun initialize() {
+		if (wasInitialized) return
+		wasInitialized = true
+		System.getProperty("firmament.testrepo")?.let { compTimeRepo ->
+			reloadForTest(Path.of(compTimeRepo))
+			return
+		}
+		neuRepo = makeNEURepository(RepoDownloadManager.repoSavedLocation)
 		if (Config.autoUpdate) {
 			launchAsyncUpdate()
 		} else {
@@ -131,6 +150,12 @@ object RepoManager {
 		}
 	}
 
+	init {
+		if (TestUtil.isInTest) {
+			initialize()
+		}
+	}
+
 	fun getPotentialStubPetData(skyblockId: SkyblockId): PetData? {
 		val parts = skyblockId.neuItem.split(";")
 		if (parts.size != 2) {
diff --git a/src/main/kotlin/util/ErrorUtil.kt b/src/main/kotlin/util/ErrorUtil.kt
index b06093b..5dc44d3 100644
--- a/src/main/kotlin/util/ErrorUtil.kt
+++ b/src/main/kotlin/util/ErrorUtil.kt
@@ -10,7 +10,7 @@ import moe.nea.firmament.Firmament
 @Suppress("NOTHING_TO_INLINE") // Suppressed since i want the logger to not pick up the ErrorUtil stack-frame
 object ErrorUtil {
 	var aggressiveErrors = run {
-		Thread.currentThread().stackTrace.any { it.className.startsWith("org.junit.") } || Firmament.DEBUG
+		TestUtil.isInTest || Firmament.DEBUG
 			|| ErrorUtil::class.java.desiredAssertionStatus()
 	}
 
diff --git a/src/main/kotlin/util/MC.kt b/src/main/kotlin/util/MC.kt
index cbcd8ae..3f5d633 100644
--- a/src/main/kotlin/util/MC.kt
+++ b/src/main/kotlin/util/MC.kt
@@ -102,7 +102,7 @@ object MC {
 	inline val handledScreen: HandledScreen<*>? get() = instance.currentScreen as? HandledScreen<*>
 	inline val window get() = instance.window
 	inline val currentRegistries: RegistryWrapper.WrapperLookup? get() = world?.registryManager
-	val defaultRegistries: RegistryWrapper.WrapperLookup = BuiltinRegistries.createWrapperLookup()
+	val defaultRegistries: RegistryWrapper.WrapperLookup by lazy { BuiltinRegistries.createWrapperLookup() }
 	inline val currentOrDefaultRegistries get() = currentRegistries ?: defaultRegistries
 	val defaultItems: RegistryWrapper.Impl<Item> = defaultRegistries.getOrThrow(RegistryKeys.ITEM)
 	var lastWorld: World? = null
diff --git a/src/main/kotlin/util/TestUtil.kt b/src/main/kotlin/util/TestUtil.kt
new file mode 100644
index 0000000..68a406f
--- /dev/null
+++ b/src/main/kotlin/util/TestUtil.kt
@@ -0,0 +1,5 @@
+package moe.nea.firmament.util
+
+object TestUtil {
+	val isInTest = Thread.currentThread().stackTrace.any { it.className.startsWith("org.junit.") }
+}
diff --git a/src/main/kotlin/util/skyblock/SackUtil.kt b/src/main/kotlin/util/skyblock/SackUtil.kt
index 2679949..fd67c44 100644
--- a/src/main/kotlin/util/skyblock/SackUtil.kt
+++ b/src/main/kotlin/util/skyblock/SackUtil.kt
@@ -60,8 +60,13 @@ object SackUtil {
 	@Subscribe
 	fun updateFromChat(event: ProcessChatEvent) {
 		if (!event.unformattedString.startsWith("[Sacks]")) return
+		getUpdatesFromMessage(event.text)
+	}
+
+	fun getUpdatesFromMessage(text: Text): List<SackUpdate> {
 		val update = ChatUpdate()
-		event.text.siblings.forEach(update::updateFromHoverText)
+		text.siblings.forEach(update::updateFromHoverText)
+		return update.updates
 	}
 
 	data class SackUpdate(
diff --git a/src/main/kotlin/util/skyblock/SkyBlockItems.kt b/src/main/kotlin/util/skyblock/SkyBlockItems.kt
new file mode 100644
index 0000000..c94ebfe
--- /dev/null
+++ b/src/main/kotlin/util/skyblock/SkyBlockItems.kt
@@ -0,0 +1,10 @@
+package moe.nea.firmament.util.skyblock
+
+import moe.nea.firmament.util.SkyblockId
+
+object SkyBlockItems {
+	val ROTTEN_FLESH = SkyblockId("ROTTEN_FLESH")
+	val ENCHANTED_DIAMOND = SkyblockId("ENCHANTED_DIAMOND")
+	val DIAMOND = SkyblockId("DIAMOND")
+	val ANCESTRAL_SPADE = SkyblockId("ANCESTRAL_SPADE")
+}
diff --git a/src/test/kotlin/util/skyblock/SackUtilTest.kt b/src/test/kotlin/util/skyblock/SackUtilTest.kt
new file mode 100644
index 0000000..e0e3e63
--- /dev/null
+++ b/src/test/kotlin/util/skyblock/SackUtilTest.kt
@@ -0,0 +1,29 @@
+package moe.nea.firmament.test.util.skyblock
+
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+import moe.nea.firmament.test.testutil.ItemResources
+import moe.nea.firmament.util.skyblock.SackUtil
+import moe.nea.firmament.util.skyblock.SkyBlockItems
+
+class SackUtilTest {
+	@Test
+	fun testOneRottenFlesh() {
+		Assertions.assertEquals(
+			listOf(
+				SackUtil.SackUpdate(SkyBlockItems.ROTTEN_FLESH, "Rotten Flesh", 1)
+			),
+			SackUtil.getUpdatesFromMessage(ItemResources.loadText("sacks/gain-rotten-flesh"))
+		)
+	}
+
+	@Test
+	fun testAFewRegularItems() {
+		Assertions.assertEquals(
+			listOf(
+				SackUtil.SackUpdate(SkyBlockItems.ROTTEN_FLESH, "Rotten Flesh", 1)
+			),
+			SackUtil.getUpdatesFromMessage(ItemResources.loadText("sacks/gain-and-lose-regular"))
+		)
+	}
+}