cover-jet test kit support

CHANGELOG.md

@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.0.2] - 2025-12-11
+
+### Added
+
+- TestKit properties support via `testKitPropertyName` parameter in `buildGradleRunner` function
+- Integration with [CoverJet](https://github.com/gw-kit/cover-jet-plugin) plugin through `io.github.gwkit.coverjet.test-kit` system property
+- Automatic injection of TestKit properties into test project's `gradle.properties`
+
 ## [0.0.1] - 2025-12-06
 
 ### Added

gradle.properties

@@ -1,5 +1,5 @@
 group=io.github.gw-kit
-version=0.0.1
+version=0.0.2
 
 kotlin.code.style=official
 

src/main/kotlin/io/github/gwkit/gradleprobe/gradlerunner/RunnerBuilder.kt

@@ -24,21 +24,17 @@ val GRADLE_HOME: String
 fun buildGradleRunner(
     projectRoot: File,
     testKitPropertyName: String? = null,
-): GradleRunner {
-    return GradleRunner.create()
-        .withPluginClasspath()
-        .withProjectDir(projectRoot)
-        .withTestKitDir(
-            projectRoot.resolve(GRADLE_HOME).apply { mkdirs() }
-        )
-        .apply {
-            if (testKitPropertyName != null) {
-                val testKitPath: String? = System.getProperty(testKitPropertyName)
-                if (testKitPath != null) {
-                    File(projectDir, "gradle.properties").appendText(
-                        File(testKitPath).readText()
-                    )
-                }
-            }
+): GradleRunner = GradleRunner.create()
+    .withPluginClasspath()
+    .withProjectDir(projectRoot)
+    .withTestKitDir(projectRoot.resolve(GRADLE_HOME).apply { mkdirs() })
+    .apply { applyTestKit(testKitPropertyName) }
+
+private fun GradleRunner.applyTestKit(testKitPropertyName: String?) {
+    testKitPropertyName
+        ?.let(System::getProperty)
+        ?.let { testKitFile -> File(testKitFile).readText() }
+        ?.let { testKitContent ->
+            File(projectDir, "gradle.properties").appendText(testKitContent)
         }
 }

src/main/kotlin/io/github/gwkit/gradleprobe/junit/extension/GradlePluginTestExtension.kt

@@ -49,7 +49,9 @@ class GradlePluginTestExtension : TestInstancePostProcessor {
 
         with(testInstance) {
             injectProperty<RootProjectDir, File>(rootProjectDir)
-            injectProperty<GradleRunnerInstance, GradleRunner>(buildGradleRunner(rootProjectDir))
+            injectProperty<GradleRunnerInstance, GradleRunner>(
+                buildGradleRunner(rootProjectDir, TEST_KIT_FILE_PROP),
+            )
             injectProperty<ProjectFile, RestorableFile> {
                 val fileToBeRestored: File = resolveExistingFile(rootProjectDir, relativePath)
                 val originCopy: File = tempTestFile.resolve(UUID.randomUUID().toString())
@@ -141,6 +143,8 @@ class GradlePluginTestExtension : TestInstancePostProcessor {
         const val GROOVY_BUILD_FILE_NAME = "build.gradle"
         const val KOTLIN_BUILD_FILE_NAME = "build.gradle.kts"
 
+        const val TEST_KIT_FILE_PROP = "io.github.gwkit.coverjet.test-kit"
+
         val GRADLE_BUILD_FILES = setOf(GROOVY_BUILD_FILE_NAME, KOTLIN_BUILD_FILE_NAME)
     }
 }

src/test/kotlin/io/github/gwkit/gradleprobe/gradlerunner/RunTaskTest.kt

@@ -42,17 +42,19 @@ class RunTaskTest {
     }
 
     private fun createMinimalProject(): File {
-        val projectRoot = tempDir.resolve("project").apply { mkdirs() }
-        projectRoot.resolve("settings.gradle.kts").writeText("""rootProject.name = "test-project"""")
-        projectRoot.resolve("build.gradle.kts").writeText("""plugins { id("base") }""")
-        return projectRoot
+        return tempDir.resolve("project").apply {
+            mkdirs()
+            resolve("settings.gradle.kts").writeText("""rootProject.name = "test-project"""")
+            resolve("build.gradle.kts").writeText("""plugins { id("base") }""")
+        }
     }
 
     private fun createFailingProject(): File {
-        val projectRoot = tempDir.resolve("failing-project").apply { mkdirs() }
-        projectRoot.resolve("settings.gradle.kts").writeText("""rootProject.name = "failing-project"""")
-        projectRoot.resolve("build.gradle.kts").writeText(
-            """
+        return tempDir.resolve("failing-project").apply {
+            mkdirs()
+            resolve("settings.gradle.kts").writeText("""rootProject.name = "failing-project"""")
+            resolve("build.gradle.kts").writeText(
+                """
             plugins { id("base") }
 
             tasks.register("failingTask") {
@@ -61,7 +63,7 @@ class RunTaskTest {
                 }
             }
             """.trimIndent()
-        )
-        return projectRoot
+            )
+        }
     }
 }