[Gradle] Add IT for configuration cache on project with buildSrc

Related to #KT-43605

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

@@ -66,6 +66,17 @@ class ConfigurationCacheIT : AbstractConfigurationCacheIT() {
         testConfigurationCacheOf("assemble", executedTaskNames = asList(":lib-project:compileKotlin"))
     }
 
+    // KT-43605
+    @Test
+    fun testInstantExecutionWithBuildSrc() = with(Project("instantExecutionWithBuildSrc")) {
+        setupWorkingDir()
+        testConfigurationCacheOf(
+            "build", executedTaskNames = listOf(
+                ":compileKotlin",
+            )
+        )
+    }
+
     @Test
     fun testInstantExecutionForJs() = with(Project("instantExecutionToJs")) {
         testConfigurationCacheOf("assemble", executedTaskNames = asList(":compileKotlin2Js"))

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

@@ -0,0 +1,16 @@
+buildscript {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: 'kotlin'
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}

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

@@ -0,0 +1,16 @@
+buildscript {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+apply plugin: 'kotlin'

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/instantExecutionWithBuildSrc/buildSrc/src/main/kotlin/build.kt

@@ -0,0 +1 @@
+fun foo() {}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/instantExecutionWithBuildSrc/src/main/kotlin/Hello.kt

@@ -0,0 +1 @@
+fun hello() = "Hello"