[MPP, KPM]: Add test runner for KPM Model Mapping

Add new testKpmModelMapping task that will inject
`kotlin.kpm.experimentalModelMapping=true` property for all
testSuites that implements `BaseGradleIT`.

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

@@ -124,6 +124,17 @@ projectTest(
     if (isTeamcityBuild) finalizedBy(cleanTestKitCacheTask)
 }
 
+projectTest(
+    "testKpmModelMapping",
+    shortenTempRootName = shortenTempRootName,
+    jUnitMode = JUnitMode.JUnit5
+) {
+    systemProperty("kotlin.gradle.kpm.enableModelMapping", "true")
+    includeMppAndAndroid(false)
+    includeNative(false)
+    if (isTeamcityBuild) finalizedBy(cleanTestKitCacheTask)
+}
+
 if (isTeamcityBuild) {
     projectTest(
         "testNative",

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

@@ -39,13 +39,24 @@ abstract class BaseGradleIT {
 
     protected var workingDir = File(".")
 
-    internal open fun defaultBuildOptions(): BuildOptions = BuildOptions(withDaemon = true)
+    internal open fun defaultBuildOptions(): BuildOptions = BuildOptions(
+        withDaemon = true,
+        enableKpmModelMapping = isKpmModelMappingEnabled
+    )
 
     open val defaultGradleVersion: GradleVersionRequired
         get() = GradleVersionRequired.None
 
     val isTeamCityRun = System.getenv("TEAMCITY_VERSION") != null
 
+    /**
+     * `var` makes it configurable per test
+     * `open` makes it configurable per test suite
+     */
+    protected open var isKpmModelMappingEnabled = System
+        .getProperty("kotlin.gradle.kpm.enableModelMapping")
+        .toBoolean()
+
     @Before
     open fun setUp() {
         // Aapt2 from Android Gradle Plugin 3.2 and below does not handle long paths on Windows.
@@ -264,6 +275,7 @@ abstract class BaseGradleIT {
         val hierarchicalMPPStructureSupport: Boolean? = null,
         val enableCompatibilityMetadataVariant: Boolean? = null,
         val withReports: List<BuildReportType> = emptyList(),
+        val enableKpmModelMapping: Boolean? = null,
     )
 
     enum class ConfigurationCacheProblems {
@@ -932,6 +944,10 @@ Finished executing task ':$taskName'|
                 add("-Pkotlin.build.report.output=${options.withReports.joinToString { it.name }}")
             }
 
+            if (options.enableKpmModelMapping != null) {
+                add("-Pkotlin.kpm.experimentalModelMapping=${options.enableKpmModelMapping}")
+            }
+
             add("-Dorg.gradle.unsafe.configuration-cache=${options.configurationCache}")
             add("-Dorg.gradle.unsafe.configuration-cache-problems=${options.configurationCacheProblems.name.toLowerCase()}")