[Gradle][MPP] Implement additional InternalKotlinSourceSetTests

.. for withDependsOnClosure and compilations

^KT-52726 Verification Pending

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/sources/InternalKotlinSourceSetTest.kt

@@ -7,11 +7,16 @@
 
 package org.jetbrains.kotlin.gradle.sources
 
+import org.jetbrains.kotlin.gradle.buildProjectWithMPP
+import org.jetbrains.kotlin.gradle.dsl.multiplatformExtension
+import org.jetbrains.kotlin.gradle.plugin.KotlinCompilation
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
 import org.jetbrains.kotlin.gradle.plugin.sources.InternalKotlinSourceSet
+import org.jetbrains.kotlin.gradle.plugin.sources.internal
 import org.jetbrains.kotlin.gradle.reflections
 import kotlin.reflect.full.isSubclassOf
 import kotlin.test.Test
+import kotlin.test.assertEquals
 import kotlin.test.fail
 
 class InternalKotlinSourceSetTest {
@@ -26,4 +31,84 @@ class InternalKotlinSourceSetTest {
                 }
             }
     }
+
+    @Test
+    fun `test - compilations - sample - 0`() {
+        val project = buildProjectWithMPP()
+        val kotlin = project.multiplatformExtension
+
+        val jvm = kotlin.jvm()
+        val linux = kotlin.linuxX64()
+        val macos = kotlin.macosX64()
+
+        val metadataCompilation = kotlin.metadata().compilations.getByName("main")
+        val jvmCompilation = jvm.compilations.getByName("main")
+        val linuxCompilation = linux.compilations.getByName("main")
+        val macosCompilation = macos.compilations.getByName("main")
+
+        val commonMain = kotlin.sourceSets.getByName("commonMain")
+        val linuxX4Main = kotlin.sourceSets.getByName("linuxX64Main")
+        val macosX64Main = kotlin.sourceSets.getByName("macosX64Main")
+
+        val nativeMain = kotlin.sourceSets.create("nativeMain")
+        nativeMain.dependsOn(commonMain)
+
+        assertEquals<Set<KotlinCompilation<*>>>(
+            setOf(metadataCompilation, jvmCompilation, linuxCompilation, macosCompilation),
+            commonMain.internal.compilations
+        )
+
+        assertEquals(
+            emptySet(),
+            nativeMain.internal.compilations
+        )
+
+        linuxX4Main.dependsOn(nativeMain)
+        assertEquals<Set<KotlinCompilation<*>>>(
+            setOf(linuxCompilation),
+            nativeMain.internal.compilations
+        )
+
+        macosX64Main.dependsOn(nativeMain)
+        assertEquals<Set<KotlinCompilation<*>>>(
+            setOf(linuxCompilation, macosCompilation),
+            nativeMain.internal.compilations
+        )
+    }
+
+    @Test
+    fun `test - withDependsOnClosure - sample - 0`() {
+        val project = buildProjectWithMPP()
+        val kotlin = project.multiplatformExtension
+
+        kotlin.linuxX64()
+
+        val commonMain = kotlin.sourceSets.getByName("commonMain")
+        val nativeMain = kotlin.sourceSets.create("nativeMain")
+        val linuxMain = kotlin.sourceSets.create("linuxMain")
+        val linuxX64Main = kotlin.sourceSets.getByName("linuxX64Main")
+
+        assertEquals(
+            setOf(commonMain, linuxX64Main),
+            linuxX64Main.internal.withDependsOnClosure
+        )
+
+        linuxX64Main.dependsOn(linuxMain)
+        assertEquals(
+            setOf(commonMain, linuxMain, linuxX64Main),
+            linuxX64Main.internal.withDependsOnClosure
+        )
+
+        linuxMain.dependsOn(nativeMain)
+        assertEquals(
+            setOf(commonMain, nativeMain, linuxMain, linuxX64Main),
+            linuxX64Main.internal.withDependsOnClosure
+        )
+
+        nativeMain.dependsOn(commonMain)
+        assertEquals(
+            setOf(commonMain, nativeMain, linuxMain, linuxX64Main),
+            linuxX64Main.internal.withDependsOnClosure
+        )
+    }
 }