Fix flushing coverage

coverage-plugin/build.gradle.kts

@@ -18,13 +18,13 @@ gradlePlugin {
 
 dependencies {
     implementation(gradleApi())
-    implementation(projects.jacocoReflect)
     implementation(libs.jacoco.agent) {
         artifact {
             classifier = "runtime"
             extension = "jar"
         }
     }
+    implementation(projects.jacocoReflect)
 
     testImplementation(projects.junit5)
     testImplementation(libs.junit)

coverage-plugin/src/main/kotlin/com/toasttab/gradle/testkit/FlushJacocoPlugin.kt

@@ -33,9 +33,6 @@ class FlushJacocoPlugin @Inject constructor(
 
 class DumpAction : FlowAction<FlowParameters.None> {
     override fun execute(parameters: FlowParameters.None) {
-        JacocoRt.requiredAgent.run {
-            writeExecutionData(true)
-            shutdown()
-        }
+        JacocoRt.requiredAgent.dump(true)
     }
 }

integration-tests/build.gradle.kts

@@ -10,12 +10,14 @@ plugins {
 
 gradlePlugin {
     plugins {
-        create("integration") {
-            id = "com.toasttab.testkit.integration.test"
-            implementationClass = "com.toasttab.gradle.testkit.TestPlugin"
-            description = ProjectInfo.description
-            displayName = ProjectInfo.name
-            tags = listOf("jacoco", "testkit")
+        for (i in 1..5) {
+            create("test$i") {
+                id = "com.toasttab.testkit.integration.test$i"
+                implementationClass = "com.toasttab.gradle.testkit.TestPlugin$i"
+                description = "test"
+                displayName = "test"
+                tags = listOf("test")
+            }
         }
     }
 }
@@ -34,7 +36,6 @@ dependencies {
     implementation(gradleApi())
     testImplementation(libs.junit)
     testImplementation(libs.strikt.core)
-    testImplementation(projects.jacocoReflect)
     testImplementation(projects.junit5)
     testImplementation(gradleTestKit())
     testImplementation(libs.jacoco.core)

integration-tests/src/main/kotlin/com/toasttab/gradle/testkit/TestPlugin.kt → integration-tests/src/main/kotlin/com/toasttab/gradle/testkit/TestPlugin1.kt

@@ -18,7 +18,7 @@ package com.toasttab.gradle.testkit
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 
-class TestPlugin : Plugin<Project> {
+class TestPlugin1 : Plugin<Project> {
     override fun apply(project: Project) {
     }
 }

integration-tests/src/main/kotlin/com/toasttab/gradle/testkit/TestPlugin2.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2024 Toast Inc.
+ *
+ * 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
+ * http://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.
+ */
+
+package com.toasttab.gradle.testkit
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+class TestPlugin2 : Plugin<Project> {
+    override fun apply(project: Project) {
+    }
+}

integration-tests/src/main/kotlin/com/toasttab/gradle/testkit/TestPlugin3.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2024 Toast Inc.
+ *
+ * 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
+ * http://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.
+ */
+
+package com.toasttab.gradle.testkit
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+class TestPlugin3 : Plugin<Project> {
+    override fun apply(project: Project) {
+    }
+}

integration-tests/src/main/kotlin/com/toasttab/gradle/testkit/TestPlugin4.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2024 Toast Inc.
+ *
+ * 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
+ * http://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.
+ */
+
+package com.toasttab.gradle.testkit
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+class TestPlugin4 : Plugin<Project> {
+    override fun apply(project: Project) {
+    }
+}

integration-tests/src/main/kotlin/com/toasttab/gradle/testkit/TestPlugin5.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2024 Toast Inc.
+ *
+ * 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
+ * http://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.
+ */
+
+package com.toasttab.gradle.testkit
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+class TestPlugin5 : Plugin<Project> {
+    override fun apply(project: Project) {
+    }
+}

integration-tests/src/test/kotlin/com/toasttab/gradle/testkit/FlushJacocoPluginIntegrationTest.kt

@@ -21,6 +21,7 @@ import org.junit.jupiter.api.io.TempDir
 import strikt.api.expectThat
 import strikt.assertions.contains
 import java.nio.file.Path
+import kotlin.io.path.createDirectory
 import kotlin.io.path.inputStream
 import kotlin.io.path.writeText
 
@@ -32,23 +33,32 @@ class FlushJacocoPluginIntegrationTest {
     fun `coverage is flushed`() {
         val version = System.getProperty("version")
 
-        val file = dir.resolve("build/testkit.exec")
+        val file = dir.resolve("testkit.exec")
+        val recorder = CoverageRecorder(CoverageSettings("", "", file.toString()))
 
-        dir.resolve("gradle.properties").writeText(
-            "systemProp.jacoco-agent.destfile=$file"
-        )
+        for (i in 1..5) {
+            val projectDir = dir.resolve("project$i")
+            projectDir.createDirectory()
 
-        dir.resolve("build.gradle.kts").writeText(
-            """
+            projectDir.resolve("build.gradle.kts").writeText(
+                """
                 plugins {
                     java
                     id("com.toasttab.testkit.coverage") version("$version")
-                    id("com.toasttab.testkit.integration.test") version("$version")
+                    id("com.toasttab.testkit.integration.test$i") version("$version")
                 }
-            """.trimIndent()
-        )
+                """.trimIndent()
+            )
 
-        TestProjectExtension.createProject(dir, GradleVersionArgument.of("8.7")).build("build", "--configuration-cache", "--stacktrace")
+            TestProjectExtension.createProject(
+                projectDir = projectDir,
+                gradleVersion = GradleVersionArgument.of("8.7"),
+                cleanup = true,
+                coverageRecorder = recorder
+            ).build("build", "--configuration-cache", "--stacktrace")
+        }
+
+        recorder.close()
 
         val classes = hashSetOf<String>()
 
@@ -64,6 +74,8 @@ class FlushJacocoPluginIntegrationTest {
             }.read()
         }
 
-        expectThat(classes).contains(TestPlugin::class.java.name.replace('.', '/'))
+        expectThat(classes).contains(
+            (1..5).map { "com/toasttab/gradle/testkit/TestPlugin$it" }
+        )
     }
 }

jacoco-reflect/src/main/kotlin/com/toasttab/gradle/testkit/jacoco/JacocoRt.kt

@@ -18,13 +18,11 @@ package com.toasttab.gradle.testkit.jacoco
 interface JacocoAgent {
     val location: String
 
-    fun writeExecutionData(reset: Boolean)
+    fun dump(reset: Boolean)
 
     val includes: String
 
     val excludes: String
-
-    fun shutdown()
 }
 
 private class ReflectiveJacocoAgent(
@@ -35,24 +33,15 @@ private class ReflectiveJacocoAgent(
         agent.javaClass.getDeclaredField("options").apply { isAccessible = true }.get(agent)
     }
 
-    private val output by lazy {
-        // agent.output
-        agent.javaClass.getDeclaredField("output").apply { isAccessible = true }.get(agent)
-    }
-
     override val location: String
         get() = agent.javaClass.protectionDomain.codeSource.location.file
     override val includes: String
         get() = options.javaClass.getMethod("getIncludes").invoke(options) as String
     override val excludes: String
         get() = options.javaClass.getMethod("getExcludes").invoke(options) as String
 
-    override fun writeExecutionData(reset: Boolean) {
-        output.javaClass.getMethod("writeExecutionData", Boolean::class.java).invoke(output, reset)
-    }
-
-    override fun shutdown() {
-        output.javaClass.getMethod("shutdown").invoke(output)
+    override fun dump(reset: Boolean) {
+        agent.javaClass.getMethod("dump", Boolean::class.java).invoke(agent, reset)
     }
 }