Add 'kgpSimpleTests' task.

This task run all JUnit5 tests with annotated with '@SimpleKGPTests`
annotation and also will be used in CI configuration.

^KT-45745 In Progress

libraries/tools/kotlin-gradle-plugin-integration-tests/build.gradle.kts

@@ -159,8 +159,22 @@ if (isTeamcityBuild) {
     }
 }
 
+val KGP_TEST_TASKS_GROUP = "Kotlin Gradle Plugin Verification"
+
+val simpleTestsTask = tasks.register<Test>("kgpSimpleTests") {
+    group = KGP_TEST_TASKS_GROUP
+    description = "Run only simple tests for Kotlin Gradle Plugin"
+    maxParallelForks = (Runtime.getRuntime().availableProcessors() / 4).coerceAtLeast(1)
+
+    useJUnitPlatform {
+        includeTags("SimpleKGP")
+        includeEngines("junit-jupiter")
+    }
+}
+
 tasks.named<Task>("check") {
     dependsOn("testAdvanceGradleVersion")
+    dependsOn(simpleTestsTask)
     if (isTeamcityBuild) {
         dependsOn("testAdvanceGradleVersionMppAndAndroid")
         dependsOn("testMppAndAndroid")
@@ -170,6 +184,17 @@ tasks.named<Task>("check") {
     }
 }
 
+val kgpJunit5Tests = tasks.register<Test>("kgpJunit5Tests") {
+    group = KGP_TEST_TASKS_GROUP
+    description = "Run only JUnit 5 tests for Kotlin Gradle Plugin"
+    maxParallelForks = (Runtime.getRuntime().availableProcessors() / 4).coerceAtLeast(1)
+
+    useJUnitPlatform {
+        includeTags("JUnit5")
+        includeEngines("junit-jupiter")
+    }
+}
+
 tasks.withType<KotlinCompile> {
     kotlinOptions.jdkHome = rootProject.extra["JDK_18"] as String
     kotlinOptions.jvmTarget = "1.8"
@@ -197,8 +222,16 @@ tasks.withType<Test> {
 
     useAndroidSdk()
 
-    maxHeapSize = "512m"
+    val shouldApplyJunitPlatform = name !in setOf(
-    useJUnitPlatform()
+        simpleTestsTask.name,
+        kgpJunit5Tests.name
+    )
+    if (shouldApplyJunitPlatform) {
+        maxHeapSize = "512m"
+        useJUnitPlatform {
+            includeEngines("junit-vintage")
+        }
+    }
 
     testLogging {
         // set options for log level LIFECYCLE
@@ -233,14 +266,3 @@ tasks.withType<Test> {
         })
     }
 }
-
-tasks.register<Test>("kgpJunit5Tests") {
-    group = "Verification"
-    description = "Run only JUnit 5 tests for Kotlin Gradle Plugin"
-    maxParallelForks = (Runtime.getRuntime().availableProcessors() / 4).coerceAtLeast(1)
-
-    useJUnitPlatform {
-        includeTags("JUnit5")
-        includeEngines("junit-jupiter")
-    }
-}

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

@@ -14,6 +14,8 @@ import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.DisplayName
 import java.io.File
 
+@SimpleGradlePluginPTests
+@DisplayName("Kotlin Java Toolchain support")
 class KotlinJavaToolchainTest : KGPBaseTest() {
 
     @GradleTest

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

@@ -5,8 +5,8 @@ import org.gradle.api.logging.configuration.WarningMode
 import org.gradle.util.GradleVersion
 import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.DisplayName
-import org.junit.jupiter.api.Tag
 
+@SimpleGradlePluginPTests
 @DisplayName("KGP simple tests")
 class SimpleKotlinGradleIT : KGPBaseTest() {
 

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

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.testbase
+
+import org.junit.jupiter.api.Tag
+
+/**
+ * Add it to test classes performing simple KGP checks.
+ */
+@Target(AnnotationTarget.CLASS, AnnotationTarget.ANNOTATION_CLASS, AnnotationTarget.FUNCTION)
+@Retention(AnnotationRetention.RUNTIME)
+@Tag("SimpleKGP")
+annotation class SimpleGradlePluginPTests