diff --git a/.github/workflows/build-pull-request.yaml b/.github/workflows/build-pull-request.yaml
index a3fd160..20a828a 100644
--- a/.github/workflows/build-pull-request.yaml
+++ b/.github/workflows/build-pull-request.yaml
@@ -10,6 +10,8 @@ jobs:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 #v4.1.7
       - uses: gradle/actions/setup-gradle@dbbdc275be76ac10734476cc723d82dfe7ec6eda #v3.4.2
       - run: |
-          ./gradlew build 
+          ./gradlew build
+          ./gradlew -p test-plugin build
+          ./gradlew -p test-plugin-isolated build
           ./gradlew -p test-app build
-          ./gradlew -p sample-app build
+          ./gradlew -p sample-app prepareIngredients
diff --git a/build-logic/build.gradle.kts b/build-logic/build.gradle.kts
index d9f1e22..1bdbd5b 100644
--- a/build-logic/build.gradle.kts
+++ b/build-logic/build.gradle.kts
@@ -20,6 +20,6 @@ group = "build-logic"
 
 /**
  * Ideally would use Runtime.version().feature() but the current Gradle still ships with Kotlin 1.9
- * that doesn't know about Java 22 🤷‍♂️
+ * that doesn't know about Java 22
  */
 configureJavaCompatibility(17)
diff --git a/build-logic/src/main/kotlin/main.kt b/build-logic/src/main/kotlin/main.kt
new file mode 100644
index 0000000..d0e70e4
--- /dev/null
+++ b/build-logic/src/main/kotlin/main.kt
@@ -0,0 +1,16 @@
+import com.gradleup.librarian.gradle.librarianModule
+import org.gradle.api.Project
+import org.gradle.api.publish.PublishingExtension
+
+fun Project.module() {
+  librarianModule()
+
+  val publishing = extensions.getByName("publishing") as PublishingExtension
+
+  publishing.repositories {
+    it.maven {
+      it.name = "PluginTest"
+      it.url = uri(rootDir.resolve("build/m2"))
+    }
+  }
+}
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 187ebb1..7db2a33 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -10,4 +10,10 @@ buildscript {
     }
 }
 
-librarianRoot()
\ No newline at end of file
+librarianRoot()
+
+tasks.register("publishAllPublicationsToPluginTestRepository") {
+    subprojects {
+        dependsOn("$path:publishAllPublicationsToPluginTestRepository")
+    }
+}
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 9355b41..94113f2 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/gratatouille-core/build.gradle.kts b/gratatouille-core/build.gradle.kts
index 84fd1bc..67381fd 100644
--- a/gratatouille-core/build.gradle.kts
+++ b/gratatouille-core/build.gradle.kts
@@ -1,11 +1,9 @@
-import com.gradleup.librarian.gradle.librarianModule
-
 plugins {
     id("org.jetbrains.kotlin.jvm")
     id("org.jetbrains.kotlin.plugin.serialization")
 }
 
-librarianModule()
+module()
 
 dependencies {
     implementation(libs.kotlin.test)
diff --git a/gratatouille-gradle-plugin/build.gradle.kts b/gratatouille-gradle-plugin/build.gradle.kts
index 160a899..a4e78ee 100644
--- a/gratatouille-gradle-plugin/build.gradle.kts
+++ b/gratatouille-gradle-plugin/build.gradle.kts
@@ -1,5 +1,3 @@
-import com.gradleup.librarian.gradle.librarianModule
-
 plugins {
     id("org.jetbrains.kotlin.jvm")
     id("org.jetbrains.kotlin.plugin.serialization")
@@ -7,7 +5,7 @@ plugins {
     id("java-gradle-plugin")
 }
 
-librarianModule()
+module()
 
 dependencies {
     implementation(libs.kotlin.test)
diff --git a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleApiPlugin.kt b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleApiPlugin.kt
index dad49af..4d203c2 100644
--- a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleApiPlugin.kt
+++ b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleApiPlugin.kt
@@ -9,12 +9,14 @@ import javax.inject.Inject
 
 class GratatouilleApiPlugin : Plugin<Project> {
     override fun apply(target: Project) {
+        target.extensions.create("gratatouille", GratatouilleExtension::class.java, target)
         target.configurations.create("gratatouille") {
             it.isTransitive = false
         }
-        target.withPlugins("org.jetbrains.kotlin.jvm") {
+        target.withRequiredPlugins("org.jetbrains.kotlin.jvm") {
             target.configure()
         }
+        target.configureDefaultVersionsResolutionStrategy()
     }
 
     private fun Project.configure() {
@@ -45,4 +47,4 @@ class GratatouilleApiPlugin : Plugin<Project> {
 abstract class ExtractGratatouilleSources: Copy() {
     @Inject
     abstract fun getArchiveOperations(): ArchiveOperations
-}
\ No newline at end of file
+}
diff --git a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleExtension.kt b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleExtension.kt
index cd54215..e424699 100644
--- a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleExtension.kt
+++ b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleExtension.kt
@@ -24,7 +24,7 @@ class PluginSpec(private val id: String, private val project: Project) {
       // From https://github.com/gradle/gradle/blob/master/platforms/extensibility/plugin-development/src/main/java/org/gradle/plugin/devel/plugins/JavaGradlePluginPlugin.java#L253
       project.tasks.named("processResources", Copy::class.java) {
         val copyPluginDescriptors: CopySpec = it.rootSpec.addChild()
-        copyPluginDescriptors.into("META-INF/gradle-plugins")
+        copyPluginDescriptors.into("/")
         copyPluginDescriptors.from(connection.directory)
       }
     }
@@ -53,7 +53,7 @@ class PluginSpec(private val id: String, private val project: Project) {
    *
    * @param mainPublication the publication to redirect to.
    */
-  fun marker(mainPublication: MavenPublication) {
+  fun mainPublication(mainPublication: MavenPublication) {
     project.withRequiredPlugins("maven-publish") {
       project.extensions.getByType(PublishingExtension::class.java).apply {
         // https://github.com/gradle/gradle/blob/master/platforms/extensibility/plugin-development/src/main/java/org/gradle/plugin/devel/plugins/MavenPluginPublishPlugin.java#L88
@@ -82,9 +82,25 @@ class PluginSpec(private val id: String, private val project: Project) {
       }
     }
   }
+
+  fun mainPublication(mainPublication: String) {
+    project.withRequiredPlugins("maven-publish") {
+      project.extensions.getByType(PublishingExtension::class.java).apply {
+        val publication = publications.findByName(mainPublication)
+        check(publication != null) {
+          "Gratatouille: cannot find publication named '$mainPublication'"
+        }
+        check(publication is MavenPublication) {
+          "Gratatouille: publication '$mainPublication' is not an instance of MavenPublication"
+        }
+        mainPublication(publication)
+      }
+    }
+  }
 }
 
-private fun String.displayName() = this.split(".").joinToString(separator = "") { it.replaceFirstChar { it.uppercase() } }
+private fun String.displayName() =
+  this.split(".").joinToString(separator = "") { it.replaceFirstChar { it.uppercase() } }
 
 abstract class GratatouilleExtension(private val project: Project) {
   fun plugin(id: String, action: Action<PluginSpec>) {
diff --git a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleImplementationPlugin.kt b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleImplementationPlugin.kt
index b937da3..4de1c67 100644
--- a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleImplementationPlugin.kt
+++ b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouilleImplementationPlugin.kt
@@ -7,15 +7,14 @@ import org.gradle.api.Project
 
 class GratatouilleImplementationPlugin : Plugin<Project> {
     override fun apply(target: Project) {
-        target.withPlugins("org.jetbrains.kotlin.jvm", "com.google.devtools.ksp") {
+        target.withRequiredPlugins("org.jetbrains.kotlin.jvm", "com.google.devtools.ksp") {
             target.configurations.getByName("ksp").dependencies.add(
-                target.dependencies.create("${BuildConfig.group}:gratatouille-processor:${BuildConfig.version}")
+                target.dependencies.create("${BuildConfig.group}:gratatouille-processor")
             )
             target.configurations.getByName("implementation").dependencies.add(
-                target.dependencies.create("${BuildConfig.group}:gratatouille-core:${BuildConfig.version}")
+                target.dependencies.create("${BuildConfig.group}:gratatouille-core")
             )
 
-
             target.afterEvaluate {
                 target.extensions.getByName("ksp").apply {
                     this as KspExtension
@@ -23,5 +22,6 @@ class GratatouilleImplementationPlugin : Plugin<Project> {
                 }
             }
         }
+        target.configureDefaultVersionsResolutionStrategy()
     }
 }
diff --git a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouillePlugin.kt b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouillePlugin.kt
index ebd9b35..a4f9db0 100644
--- a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouillePlugin.kt
+++ b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/GratatouillePlugin.kt
@@ -6,14 +6,16 @@ import org.gradle.api.Project
 
 class GratatouillePlugin : Plugin<Project> {
     override fun apply(target: Project) {
-        target.withPlugins("org.jetbrains.kotlin.jvm", "com.google.devtools.ksp") {
+        target.extensions.create("gratatouille", GratatouilleExtension::class.java, target)
+        target.withRequiredPlugins("org.jetbrains.kotlin.jvm", "com.google.devtools.ksp") {
             target.configurations.getByName("ksp").dependencies.add(
-                target.dependencies.create("${BuildConfig.group}:gratatouille-processor:${BuildConfig.version}")
+                target.dependencies.create("${BuildConfig.group}:gratatouille-processor")
             )
             target.configurations.getByName("implementation").dependencies.add(
-                target.dependencies.create("${BuildConfig.group}:gratatouille-core:${BuildConfig.version}")
+                target.dependencies.create("${BuildConfig.group}:gratatouille-core")
             )
         }
+        target.configureDefaultVersionsResolutionStrategy()
     }
 }
 
diff --git a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/utils.kt b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/utils.kt
index d4640c5..80f20ad 100644
--- a/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/utils.kt
+++ b/gratatouille-gradle-plugin/src/main/kotlin/gratatouille/gradle/utils.kt
@@ -3,6 +3,7 @@ package gratatouille.gradle
 import com.gradleup.gratatouille.gradle.BuildConfig
 import org.gradle.api.Project
 import org.gradle.api.artifacts.ExternalDependency
+import org.gradle.api.artifacts.component.ModuleComponentSelector
 
 
 internal fun Project.withRequiredPlugins(vararg ids: String, block: () -> Unit) {
@@ -26,7 +27,6 @@ internal fun Project.withRequiredPlugins(vararg ids: String, block: () -> Unit)
 
 internal fun Project.configureDefaultVersionsResolutionStrategy() {
     configurations.configureEach { configuration ->
-        // Use the API introduced in Gradle 4.4 to modify the dependencies directly before they are resolved:
         configuration.withDependencies { dependencySet ->
             val pluginVersion = VERSION
             dependencySet.filterIsInstance<ExternalDependency>()
diff --git a/gratatouille-processor/build.gradle.kts b/gratatouille-processor/build.gradle.kts
index 2a0365f..f5fd8a0 100644
--- a/gratatouille-processor/build.gradle.kts
+++ b/gratatouille-processor/build.gradle.kts
@@ -1,10 +1,8 @@
-import com.gradleup.librarian.gradle.librarianModule
-
 plugins {
     id("org.jetbrains.kotlin.jvm")
 }
 
-librarianModule()
+module()
 
 dependencies {
     implementation(libs.kotlin.test)
diff --git a/gratatouille-processor/src/main/kotlin/gratatouille/processor/GTaskAction.kt b/gratatouille-processor/src/main/kotlin/gratatouille/processor/GTaskAction.kt
index 6d022af..b9fec55 100644
--- a/gratatouille-processor/src/main/kotlin/gratatouille/processor/GTaskAction.kt
+++ b/gratatouille-processor/src/main/kotlin/gratatouille/processor/GTaskAction.kt
@@ -12,7 +12,6 @@ import com.squareup.kotlinpoet.ClassName
 import com.squareup.kotlinpoet.ParameterizedTypeName
 import com.squareup.kotlinpoet.TypeName
 import com.squareup.kotlinpoet.ksp.toTypeName
-import com.sun.org.apache.xpath.internal.operations.Bool
 
 internal class GTaskAction(
   val packageName: String,
diff --git a/gratatouille-processor/src/main/kotlin/gratatouille/processor/Task.kt b/gratatouille-processor/src/main/kotlin/gratatouille/processor/Task.kt
index 0ece0a5..278295d 100644
--- a/gratatouille-processor/src/main/kotlin/gratatouille/processor/Task.kt
+++ b/gratatouille-processor/src/main/kotlin/gratatouille/processor/Task.kt
@@ -9,11 +9,6 @@ internal fun GTaskAction.taskFile(): FileSpec {
 
   val fileSpec = FileSpec.builder(className)
     .addFunction(register())
-    .apply {
-      if (!pure) {
-        addBodyComment("This task is impure and not cacheable")
-      }
-    }
     .addType(task())
     .addType(workParameters())
     .addType(workAction())
@@ -146,7 +141,8 @@ private fun GTaskAction.task(): TypeSpec {
             .build()
         )
       } else {
-        addFunction(FunSpec.builder("init").addCode("outputs.upToDateWhen { false }").build())
+        addKdoc("This task is impure and not cacheable")
+        addInitializerBlock(CodeBlock.of("outputs.upToDateWhen { false }\n"))
       }
     }
     .addModifiers(KModifier.ABSTRACT, KModifier.INTERNAL)
diff --git a/librarian.properties b/librarian.properties
index bf8bf28..d837acf 100644
--- a/librarian.properties
+++ b/librarian.properties
@@ -1,4 +1,4 @@
-java.compatibility=8
+java.compatibility=11
 kotlin.compatibility=2.0.0
 
 kdoc.olderVersions=
diff --git a/libs.versions.toml b/libs.versions.toml
index cae0a56..3c05fd4 100644
--- a/libs.versions.toml
+++ b/libs.versions.toml
@@ -1,6 +1,6 @@
 [versions]
-ksp = "2.0.20-1.0.24"
-kotlin = "2.0.20"
+ksp = "2.0.21-1.0.26"
+kotlin = "2.0.21"
 coroutines = "1.8.0"
 kotlinpoet = "1.14.2"
 librarian = "0.0.6"
@@ -22,5 +22,6 @@ librarian = { module = "com.gradleup.librarian:librarian-gradle-plugin", version
 okio = "com.squareup.okio:okio:3.9.0"
 cast = "net.mbonnin.cast:cast:0.0.1"
 
+
 [plugins]
 librarian = { id = "com.gradleup.librarian", version.ref = "librarian"}
\ No newline at end of file
diff --git a/test-app/build.gradle.kts b/test-app/build.gradle.kts
index bbe3260..f56d0b1 100644
--- a/test-app/build.gradle.kts
+++ b/test-app/build.gradle.kts
@@ -1,11 +1,22 @@
+import testplugin.TestExtension
+import testplugin.isolated.TestExtensionIsolated
 import kotlin.test.assertFailsWith
 
-plugins {
-  id("testplugin")
-  id("testplugin.isolated")
+buildscript {
+  dependencies {
+    classpath("test-plugin:test-plugin")
+    classpath("test-plugin-isolated:api")
+  }
+  repositories {
+    mavenCentral()
+  }
 }
 
-testExtension {
+plugins.apply("testplugin")
+plugins.apply("testplugin.isolated")
+
+extensions.getByName("testExtension").apply {
+  this as TestExtension
   stringInput.set("input")
   internalInput.set("internalInput")
   //optionalInput.set()
@@ -26,7 +37,8 @@ testExtension {
   fileOutput3.set(file("build/output"))
 }
 
-testExtensionIsolated {
+extensions.getByName("testExtensionIsolated").apply {
+  this as TestExtensionIsolated
   stringInput.set("world")
 }
 
diff --git a/test-app/settings.gradle.kts b/test-app/settings.gradle.kts
index ed9b107..762c8df 100644
--- a/test-app/settings.gradle.kts
+++ b/test-app/settings.gradle.kts
@@ -3,6 +3,7 @@ pluginManagement {
         it.apply {
             mavenCentral()
             google()
+            maven("../build/m2")
         }
     }
 }
diff --git a/test-plugin-isolated/api/build.gradle.kts b/test-plugin-isolated/api/build.gradle.kts
index ff8d5de..3d176a4 100644
--- a/test-plugin-isolated/api/build.gradle.kts
+++ b/test-plugin-isolated/api/build.gradle.kts
@@ -3,18 +3,45 @@ plugins {
     id("org.jetbrains.kotlin.plugin.serialization")
     id("com.google.devtools.ksp")
     id("com.gradleup.gratatouille.api")
-    id("java-gradle-plugin")
+    id("maven-publish")
+}
+
+version = "0.0.0"
+
+publishing {
+    publications {
+        create("default", MavenPublication::class.java) {
+            from(components["java"])
+        }
+    }
+    repositories {
+        maven {
+            name = "pluginTest"
+            url = uri(rootDir.resolve("../build/m2"))
+        }
+    }
 }
 
 dependencies {
     gratatouille(project(":implementation"))
 }
 
-gradlePlugin {
-    plugins {
-        create("testplugin.isolated") {
-            this.implementationClass = "testplugin.isolated.TestPluginIsolated"
-            this.id = "testplugin.isolated"
-        }
+dependencies {
+    compileOnly(libs.gradle.api)
+    testImplementation(gradleTestKit())
+    testImplementation(libs.kotlin.test)
+}
+
+
+gratatouille {
+    plugin("testplugin.isolated") {
+        implementationClass("testplugin.isolated.TestPluginIsolated")
+        mainPublication("default")
     }
+}
+
+tasks.withType(Test::class.java) {
+    dependsOn("publishAllPublicationsToPluginTestRepository")
+    dependsOn(":implementation:publishAllPublicationsToPluginTestRepository")
+    dependsOn(gradle.includedBuild("gratatouille").task(":publishAllPublicationsToPluginTestRepository"))
 }
\ No newline at end of file
diff --git a/test-plugin-isolated/api/src/test/kotlin/MainTest.kt b/test-plugin-isolated/api/src/test/kotlin/MainTest.kt
new file mode 100644
index 0000000..699e110
--- /dev/null
+++ b/test-plugin-isolated/api/src/test/kotlin/MainTest.kt
@@ -0,0 +1,29 @@
+import org.gradle.testkit.runner.BuildResult
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import java.io.File
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class MainTest {
+  val projectDir = File("build/testProject")
+
+  @Test
+  fun test() {
+    projectDir.deleteRecursively()
+
+    File("testProjects/simple").copyRecursively(projectDir)
+
+    build("taskActionIsolated").apply {
+      assertEquals(TaskOutcome.SUCCESS, task(":taskActionIsolated")!!.outcome)
+    }
+  }
+
+  private fun build(task: String): BuildResult {
+    return GradleRunner.create()
+      .withDebug(true)
+      .withProjectDir(projectDir)
+      .withArguments(task)
+      .build()!!
+  }
+}
\ No newline at end of file
diff --git a/test-plugin-isolated/api/testProjects/simple/build.gradle.kts b/test-plugin-isolated/api/testProjects/simple/build.gradle.kts
new file mode 100644
index 0000000..c6c0293
--- /dev/null
+++ b/test-plugin-isolated/api/testProjects/simple/build.gradle.kts
@@ -0,0 +1,8 @@
+plugins {
+  id("testplugin.isolated").version("0.0.0")
+}
+
+testExtensionIsolated {
+  this.stringInput.set("stringInput")
+}
+
diff --git a/test-plugin-isolated/api/testProjects/simple/inputs/file0.txt b/test-plugin-isolated/api/testProjects/simple/inputs/file0.txt
new file mode 100644
index 0000000..5ab2f8a
--- /dev/null
+++ b/test-plugin-isolated/api/testProjects/simple/inputs/file0.txt
@@ -0,0 +1 @@
+Hello
\ No newline at end of file
diff --git a/test-plugin-isolated/api/testProjects/simple/inputs/input1.json b/test-plugin-isolated/api/testProjects/simple/inputs/input1.json
new file mode 100644
index 0000000..ef90cbd
--- /dev/null
+++ b/test-plugin-isolated/api/testProjects/simple/inputs/input1.json
@@ -0,0 +1 @@
+{"value": "value"}
\ No newline at end of file
diff --git a/test-plugin-isolated/api/testProjects/simple/inputs/subdir/file1.txt b/test-plugin-isolated/api/testProjects/simple/inputs/subdir/file1.txt
new file mode 100644
index 0000000..50eb8b7
--- /dev/null
+++ b/test-plugin-isolated/api/testProjects/simple/inputs/subdir/file1.txt
@@ -0,0 +1 @@
+Hello file1.txt
\ No newline at end of file
diff --git a/test-plugin-isolated/api/testProjects/simple/settings.gradle.kts b/test-plugin-isolated/api/testProjects/simple/settings.gradle.kts
new file mode 100644
index 0000000..fb760c5
--- /dev/null
+++ b/test-plugin-isolated/api/testProjects/simple/settings.gradle.kts
@@ -0,0 +1,6 @@
+pluginManagement {
+  listOf(repositories, dependencyResolutionManagement.repositories).forEach {
+    it.mavenCentral()
+    it.maven(rootDir.resolve("../../../../build/m2"))
+  }
+}
diff --git a/test-plugin-isolated/build.gradle.kts b/test-plugin-isolated/build.gradle.kts
index 561988b..58e40c8 100644
--- a/test-plugin-isolated/build.gradle.kts
+++ b/test-plugin-isolated/build.gradle.kts
@@ -8,3 +8,4 @@ buildscript {
         classpath("com.gradleup.gratatouille:gratatouille-gradle-plugin")
     }
 }
+
diff --git a/test-plugin-isolated/implementation/build.gradle.kts b/test-plugin-isolated/implementation/build.gradle.kts
index f886b6b..1f00476 100644
--- a/test-plugin-isolated/implementation/build.gradle.kts
+++ b/test-plugin-isolated/implementation/build.gradle.kts
@@ -3,6 +3,23 @@ plugins {
     id("org.jetbrains.kotlin.plugin.serialization")
     id("com.google.devtools.ksp")
     id("com.gradleup.gratatouille.implementation")
+    id("maven-publish")
+}
+
+version = "0.0.0"
+
+publishing {
+    publications {
+        create("default", MavenPublication::class.java) {
+            from(components["java"])
+        }
+    }
+    repositories {
+        maven {
+            name = "pluginTest"
+            url = uri(rootDir.resolve("../build/m2"))
+        }
+    }
 }
 
 dependencies {
diff --git a/test-plugin/test-plugin/build.gradle.kts b/test-plugin/test-plugin/build.gradle.kts
index 1a9d135..85a7022 100644
--- a/test-plugin/test-plugin/build.gradle.kts
+++ b/test-plugin/test-plugin/build.gradle.kts
@@ -1,22 +1,41 @@
 plugins {
-    id("org.jetbrains.kotlin.jvm")
-    id("org.jetbrains.kotlin.plugin.serialization")
-    id("com.google.devtools.ksp")
-    id("com.gradleup.gratatouille")
-    id("java-gradle-plugin")
+  id("org.jetbrains.kotlin.jvm")
+  id("org.jetbrains.kotlin.plugin.serialization")
+  id("com.google.devtools.ksp")
+  id("com.gradleup.gratatouille")
+  id("maven-publish")
 }
 
-gradlePlugin {
-    plugins {
-        create("testplugin") {
-            this.implementationClass = "testplugin.TestPlugin"
-            this.id = "testplugin"
-        }
+version = "0.0.0"
+
+publishing {
+  publications {
+    create("default", MavenPublication::class.java) {
+      from(components["java"])
+    }
+  }
+  repositories {
+    maven {
+      name = "pluginTest"
+      url = uri(rootDir.resolve("../build/m2"))
     }
+  }
+}
+
+dependencies {
+  compileOnly(libs.gradle.api)
+  testImplementation(gradleTestKit())
+  testImplementation(libs.kotlin.test)
 }
 
 gratatouille {
-    plugin("testplugin") {
-        implementationClass("testplugin.TestPlugin")
-    }
+  plugin("testplugin") {
+    implementationClass("testplugin.TestPlugin")
+    mainPublication("default")
+  }
+}
+
+tasks.withType(Test::class.java) {
+  dependsOn("publishAllPublicationsToPluginTestRepository")
+  dependsOn(gradle.includedBuild("gratatouille").task(":publishAllPublicationsToPluginTestRepository"))
 }
\ No newline at end of file
diff --git a/test-plugin/test-plugin/src/main/kotlin/testplugin/TestPlugin.kt b/test-plugin/test-plugin/src/main/kotlin/testplugin/TestPlugin.kt
index 413c406..0dc3a0d 100644
--- a/test-plugin/test-plugin/src/main/kotlin/testplugin/TestPlugin.kt
+++ b/test-plugin/test-plugin/src/main/kotlin/testplugin/TestPlugin.kt
@@ -37,6 +37,10 @@ class TestPlugin : Plugin<Project> {
             input = extension.stringInput3,
             outputFile = extension.fileOutput3
         )
+
+        target.registerTaskAction4Task(
+            input = extension.stringInput
+        )
     }
 }
 
diff --git a/test-plugin/test-plugin/src/main/kotlin/testplugin/tasks.kt b/test-plugin/test-plugin/src/main/kotlin/testplugin/tasks.kt
index 50a0756..78491b3 100644
--- a/test-plugin/test-plugin/src/main/kotlin/testplugin/tasks.kt
+++ b/test-plugin/test-plugin/src/main/kotlin/testplugin/tasks.kt
@@ -2,6 +2,7 @@ package testplugin
 
 import gratatouille.*
 import kotlinx.serialization.Serializable
+import java.util.Date
 
 @Serializable
 data class Input1(val value: String)
@@ -21,7 +22,8 @@ class TaskAction2Output(val output21: Output21, val output22: Output22)
 @GTaskAction
 internal fun taskAction1(
     stringInput: String,
-    @GInternal internalInput: String,
+    @GInternal
+    internalInput: String,
     optionalInput: String?,
     setInput: Set<Int>,
     listInput: List<Int>,
@@ -64,9 +66,18 @@ internal fun taskAction2(
 @GTaskAction
 internal fun taskAction3(
     input: String,
-    @GManuallyWired outputFile: GOutputFile,
+    @GManuallyWired
+    outputFile: GOutputFile,
     outputDirectory: GOutputDirectory,
 ) {
     outputFile.writeText("$input in file")
     outputDirectory.resolve("output.txt").writeText("$input in file in dir")
+}
+
+@GTaskAction(pure = false)
+internal fun taskAction4(
+    input: String,
+    outputFile: GOutputFile,
+) {
+    outputFile.writeText("${Date()}: $input in file")
 }
\ No newline at end of file
diff --git a/test-plugin/test-plugin/src/test/kotlin/MainTest.kt b/test-plugin/test-plugin/src/test/kotlin/MainTest.kt
new file mode 100644
index 0000000..8eea8ee
--- /dev/null
+++ b/test-plugin/test-plugin/src/test/kotlin/MainTest.kt
@@ -0,0 +1,43 @@
+import org.gradle.testkit.runner.BuildResult
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import java.io.File
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class MainTest {
+  val projectDir = File("build/testProject")
+
+  @Test
+  fun test() {
+    projectDir.deleteRecursively()
+
+    File("testProjects/simple").copyRecursively(projectDir)
+
+    build("taskAction1").apply {
+      assertEquals(TaskOutcome.SUCCESS, task(":taskAction1")!!.outcome)
+    }
+    build("taskAction2").apply {
+      assertEquals(TaskOutcome.UP_TO_DATE, task(":taskAction1")!!.outcome)
+      assertEquals(TaskOutcome.SUCCESS, task(":taskAction2")!!.outcome)
+    }
+    build("taskAction3").apply {
+      assertEquals(TaskOutcome.SUCCESS, task(":taskAction3")!!.outcome)
+    }
+    build("taskAction4").apply {
+      assertEquals(TaskOutcome.SUCCESS, task(":taskAction4")!!.outcome)
+    }
+    build("taskAction4").apply {
+      // taskAction4 is impure and never up-to-date
+      assertEquals(TaskOutcome.SUCCESS, task(":taskAction4")!!.outcome)
+    }
+  }
+
+  private fun build(task: String): BuildResult {
+    return GradleRunner.create()
+      .withDebug(true)
+      .withProjectDir(projectDir)
+      .withArguments(task)
+      .build()!!
+  }
+}
\ No newline at end of file
diff --git a/test-plugin/test-plugin/testProjects/simple/build.gradle.kts b/test-plugin/test-plugin/testProjects/simple/build.gradle.kts
new file mode 100644
index 0000000..dda2c04
--- /dev/null
+++ b/test-plugin/test-plugin/testProjects/simple/build.gradle.kts
@@ -0,0 +1,19 @@
+plugins {
+  id("testplugin").version("0.0.0")
+}
+
+testExtension {
+  this.mapInput.put("key", "value")
+  this.listInput.add(42)
+  this.setInput.add(43)
+  this.filesInput.from(file("inputs/file0.txt"), fileTree("inputs/subdir"))
+  this.fileInput.set(file("inputs/file0.txt"))
+  this.directoryInput.set(file("inputs/subdir"))
+  this.fileOutput3.set(file("build/file3.txt"))
+  this.internalInput.set("internalInput")
+  this.stringInput.set("stringInput")
+  this.stringInput2.set("stringInput2")
+  this.stringInput3.set("stringInput3")
+  this.serializableInput.set(file("inputs/input1.json"))
+}
+
diff --git a/test-plugin/test-plugin/testProjects/simple/inputs/file0.txt b/test-plugin/test-plugin/testProjects/simple/inputs/file0.txt
new file mode 100644
index 0000000..5ab2f8a
--- /dev/null
+++ b/test-plugin/test-plugin/testProjects/simple/inputs/file0.txt
@@ -0,0 +1 @@
+Hello
\ No newline at end of file
diff --git a/test-plugin/test-plugin/testProjects/simple/inputs/input1.json b/test-plugin/test-plugin/testProjects/simple/inputs/input1.json
new file mode 100644
index 0000000..ef90cbd
--- /dev/null
+++ b/test-plugin/test-plugin/testProjects/simple/inputs/input1.json
@@ -0,0 +1 @@
+{"value": "value"}
\ No newline at end of file
diff --git a/test-plugin/test-plugin/testProjects/simple/inputs/subdir/file1.txt b/test-plugin/test-plugin/testProjects/simple/inputs/subdir/file1.txt
new file mode 100644
index 0000000..50eb8b7
--- /dev/null
+++ b/test-plugin/test-plugin/testProjects/simple/inputs/subdir/file1.txt
@@ -0,0 +1 @@
+Hello file1.txt
\ No newline at end of file
diff --git a/test-plugin/test-plugin/testProjects/simple/settings.gradle.kts b/test-plugin/test-plugin/testProjects/simple/settings.gradle.kts
new file mode 100644
index 0000000..fb760c5
--- /dev/null
+++ b/test-plugin/test-plugin/testProjects/simple/settings.gradle.kts
@@ -0,0 +1,6 @@
+pluginManagement {
+  listOf(repositories, dependencyResolutionManagement.repositories).forEach {
+    it.mavenCentral()
+    it.maven(rootDir.resolve("../../../../build/m2"))
+  }
+}