[Gradle, BT] Add IC integration tests for the build tools API mode

#KT-61865 Fixed

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

@@ -338,6 +338,22 @@ abstract class IncrementalCompilationJvmMultiProjectWithPreciseBackupIT : Increm
     override val defaultBuildOptions = super.defaultBuildOptions.copy(usePreciseOutputsBackup = true, keepIncrementalCompilationCachesInMemory = true)
 }
 
+class IncrementalCompilationK2JvmMultiProjectBuildToolsApiDaemonIT : IncrementalCompilationJvmMultiProjectWithPreciseBackupIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(runViaBuildToolsApi = true, compilerExecutionStrategy = KotlinCompilerExecutionStrategy.DAEMON)
+
+    @Disabled("Doesn't make sense since Build Tools API supports incremental compilation for the in-process mode")
+    override fun testMissingIncrementalState(gradleVersion: GradleVersion) {
+    }
+}
+
+class IncrementalCompilationK2JvmMultiProjectBuildToolsApiInProcessIT : IncrementalCompilationJvmMultiProjectWithPreciseBackupIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(runViaBuildToolsApi = true, compilerExecutionStrategy = KotlinCompilerExecutionStrategy.IN_PROCESS)
+
+    @Disabled("Doesn't make sense since Build Tools API supports incremental compilation for the in-process mode")
+    override fun testMissingIncrementalState(gradleVersion: GradleVersion) {
+    }
+}
+
 class IncrementalCompilationK1JvmMultiProjectWithPreciseBackupIT : IncrementalCompilationJvmMultiProjectWithPreciseBackupIT() {
     override val defaultBuildOptions = super.defaultBuildOptions.copyEnsuringK1()
 }
@@ -897,7 +913,7 @@ abstract class BaseIncrementalCompilationMultiProjectIT : IncrementalCompilation
 
     @DisplayName("Test compilation when incremental state is missing")
     @GradleTest
-    fun testMissingIncrementalState(gradleVersion: GradleVersion) {
+    open fun testMissingIncrementalState(gradleVersion: GradleVersion) {
         defaultProject(gradleVersion) {
             // Perform the first non-incremental build without using Kotlin daemon so that incremental state is not produced
             build(

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

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.gradle
 
 import org.gradle.util.GradleVersion
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompilerExecutionStrategy
 import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.DisplayName
@@ -122,6 +123,56 @@ class IncrementalK2JavaChangeDefaultIT : IncrementalJavaChangeDefaultIT() {
     }
 }
 
+@DisplayName("Default incremental compilation via Build Tools API")
+class IncrementalK2JavaChangeBuildToolsApiDaemonIT : IncrementalJavaChangeDefaultIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(runViaBuildToolsApi = true, compilerExecutionStrategy = KotlinCompilerExecutionStrategy.DAEMON)
+
+    @Disabled("KT-57147")
+    override fun testAbiChangeInLib_changeMethodSignature_tracked(gradleVersion: GradleVersion) {
+        super.testAbiChangeInLib_changeMethodSignature_tracked(gradleVersion)
+    }
+
+    @Disabled("KT-57147")
+    override fun testNonAbiChangeInLib_changeMethodBody_tracked(gradleVersion: GradleVersion) {
+        super.testNonAbiChangeInLib_changeMethodBody_tracked(gradleVersion)
+    }
+
+    @Disabled("KT-57147")
+    override fun testAbiChangeInLib_changeMethodSignature(gradleVersion: GradleVersion) {
+        super.testAbiChangeInLib_changeMethodSignature(gradleVersion)
+    }
+
+    @Disabled("KT-57147")
+    override fun testNonAbiChangeInLib_changeMethodBody(gradleVersion: GradleVersion) {
+        super.testNonAbiChangeInLib_changeMethodBody(gradleVersion)
+    }
+}
+
+@DisplayName("Incremental compilation via Build Tools API using in-process strategy")
+class IncrementalK2JavaChangeBuildToolsApiInProcessIT : IncrementalJavaChangeDefaultIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(runViaBuildToolsApi = true, compilerExecutionStrategy = KotlinCompilerExecutionStrategy.IN_PROCESS)
+
+    @Disabled("KT-57147")
+    override fun testAbiChangeInLib_changeMethodSignature_tracked(gradleVersion: GradleVersion) {
+        super.testAbiChangeInLib_changeMethodSignature_tracked(gradleVersion)
+    }
+
+    @Disabled("KT-57147")
+    override fun testNonAbiChangeInLib_changeMethodBody_tracked(gradleVersion: GradleVersion) {
+        super.testNonAbiChangeInLib_changeMethodBody_tracked(gradleVersion)
+    }
+
+    @Disabled("KT-57147")
+    override fun testAbiChangeInLib_changeMethodSignature(gradleVersion: GradleVersion) {
+        super.testAbiChangeInLib_changeMethodSignature(gradleVersion)
+    }
+
+    @Disabled("KT-57147")
+    override fun testNonAbiChangeInLib_changeMethodBody(gradleVersion: GradleVersion) {
+        super.testNonAbiChangeInLib_changeMethodBody(gradleVersion)
+    }
+}
+
 @DisplayName("Default incremental compilation with precise compilation outputs backup")
 abstract class IncrementalJavaChangePreciseCompilationBackupIT : IncrementalJavaChangeDefaultIT() {
     override val defaultBuildOptions = super.defaultBuildOptions.copy(usePreciseOutputsBackup = true, keepIncrementalCompilationCachesInMemory = true)

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

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.gradle.android
 
 import org.gradle.api.logging.LogLevel
 import org.gradle.util.GradleVersion
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompilerExecutionStrategy
 import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.DisplayName
 import kotlin.io.path.appendText
@@ -181,4 +182,12 @@ open class KotlinAndroidIncrementalIT : KGPBaseTest() {
 
 class KotlinAndroidIncrementalWithPreciseBackupIT : KotlinAndroidIncrementalIT() {
     override val defaultBuildOptions = super.defaultBuildOptions.copy(usePreciseOutputsBackup = true, keepIncrementalCompilationCachesInMemory = true)
+}
+
+class KotlinAndroidIncrementalBuildToolsApiDaemonIT : KotlinAndroidIncrementalIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(runViaBuildToolsApi = true, compilerExecutionStrategy = KotlinCompilerExecutionStrategy.DAEMON)
+}
+
+class KotlinAndroidIncrementalBuildToolsApiInProcessIT : KotlinAndroidIncrementalIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(runViaBuildToolsApi = true, compilerExecutionStrategy = KotlinCompilerExecutionStrategy.IN_PROCESS)
 }