Test Java is up-to-date when Kotlin ABI is unchanged

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/JavaUpToDateIT.kt

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle
+
+import org.jetbrains.kotlin.gradle.util.modify
+import org.junit.Test
+
+class JavaUpToDateIT : BaseGradleIT() {
+    @Test
+    fun testKotlinMethodBodyIsChanged() {
+        val project = Project("javaUpToDate", GradleVersionRequired.AtLeast("4.3"))
+
+        project.build("build") {
+            assertSuccessful()
+            assertTasksExecuted(":compileKotlin", ":compileJava", ":compileTestKotlin", ":compileTestJava")
+        }
+
+        project.projectFile("MainKotlinClass.kt").modify {
+            it.replace(
+                "fun number(): Int = 0",
+                "fun number(): Int = 1"
+            )
+        }
+        project.build("build") {
+            assertSuccessful()
+            assertTasksExecuted(":compileKotlin", ":compileTestKotlin")
+            assertTasksUpToDate(":compileJava", ":compileTestJava")
+        }
+    }
+
+    @Test
+    fun testKotlinNewLineAdded() {
+        val project = Project("javaUpToDate", GradleVersionRequired.AtLeast("4.3"))
+
+        project.build("build") {
+            assertSuccessful()
+            assertTasksExecuted(":compileKotlin", ":compileJava", ":compileTestKotlin", ":compileTestJava")
+        }
+
+        project.projectFile("MainKotlinClass.kt").modify { "\n$it" }
+        project.build("build") {
+            assertSuccessful()
+            assertTasksExecuted(":compileKotlin", ":compileTestKotlin")
+            assertTasksUpToDate(":compileJava", ":compileTestJava")
+        }
+    }
+
+    @Test
+    fun testPrivateMethodSignatureChanged() {
+        val project = Project("javaUpToDate", GradleVersionRequired.AtLeast("4.3"))
+
+        project.build("build") {
+            assertSuccessful()
+            assertTasksExecuted(":compileKotlin", ":compileJava", ":compileTestKotlin", ":compileTestJava")
+        }
+
+        project.projectFile("MainKotlinClass.kt").modify {
+            it.replace(
+                "private fun privateMethod() = 0",
+                "private fun privateMethod() = \"0\""
+            )
+        }
+        project.build("build") {
+            assertSuccessful()
+            // see https://github.com/gradle/gradle/issues/5013
+            assertTasksExecuted(":compileKotlin", ":compileJava", ":compileTestKotlin", ":compileTestJava")
+        }
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/javaUpToDate/build.gradle

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+buildscript {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: "kotlin"
+apply plugin: "java"
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/javaUpToDate/src/main/java/foo/MainJavaClass.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package foo;
+
+public class MainJavaClass {
+    public int numberFromKotlin() {
+        return (new MainKotlinClass()).number();
+    }
+
+    public int number() {
+        return 0;
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/javaUpToDate/src/main/kotlin/foo/MainKotlinClass.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package foo
+
+class MainKotlinClass {
+    fun numberFromJava(): Int = MainJavaClass().number()
+
+    fun number(): Int = 0
+
+    private fun privateMethod() = 0
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/javaUpToDate/src/test/java/foo/TestJavaClass.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package foo;
+
+public class TestJavaClass {
+    public int numberFromMainKotlin() {
+        return (new MainKotlinClass()).number();
+    }
+
+    public int numberFromMainJava() {
+        return (new MainJavaClass()).number();
+    }
+
+    public int numberFromTestKotlin() {
+        return (new TestKotlinClass()).number();
+    }
+
+    public int number() {
+        return 0;
+    }
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/javaUpToDate/src/test/kotlin/foo/TestKotlinClass.kt

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package foo
+
+class TestKotlinClass {
+    fun numberFromMainKotlin(): Int = MainKotlinClass().number()
+
+    fun numberFromMainJava(): Int = MainJavaClass().number()
+
+    fun numberFromTestJava(): Int = TestJavaClass().number()
+
+    fun number(): Int = 0
+}