Add a bunch of tests on corner-cases in Gradle MPP Import

For most of those the behaviour isn't set in stone, though at the moment
of making that commit we're more or less sure that it's reasonable.

Behaviour in some cases might be more strictly enforces (as much as you
can enforce something in esoteric cases with misconfigured project
sturcture). Those are marked with comments with '!'.

idea/idea-gradle/tests/org/jetbrains/kotlin/gradle/HierarchicalMultiplatformProjectImportingTest.kt

@@ -420,6 +420,153 @@ class HierarchicalMultiplatformProjectImportingTest : MultiplePluginVersionGradl
             module("my-app.submodule.jsTest") { targetPlatform(js) }
         }
     }
+
+    @Test
+    @PluginTargetVersions(gradleVersionForLatestPlugin = mppImportTestMinVersionForMaster)
+    fun testOrphanSourceSet() {
+        configureByFiles()
+        importProject()
+
+        val jvm = JvmPlatforms.defaultJvmPlatform
+        val js = JsPlatforms.defaultJsPlatform
+        val native = NativePlatforms.unspecifiedNativePlatform
+
+        checkProjectStructure(exhaustiveModuleList = false, exhaustiveSourceSourceRootList = false, exhaustiveDependencyList = false) {
+            module("my-app.commonMain") {
+                // must not be (jvm, js, native)
+                targetPlatform(jvm, js)
+            }
+
+            module("my-app.orphan") {
+                targetPlatform(jvm, js)
+            }
+        }
+    }
+
+    @Test
+    @PluginTargetVersions(gradleVersionForLatestPlugin = mppImportTestMinVersionForMaster)
+    fun testSourceSetIncludedIntoCompilationDirectly() {
+        configureByFiles()
+        importProject()
+
+        val jvm = JvmPlatforms.defaultJvmPlatform
+        val js = JsPlatforms.defaultJsPlatform
+        val native = NativePlatforms.unspecifiedNativePlatform
+
+        checkProjectStructure(exhaustiveModuleList = false, exhaustiveSourceSourceRootList = false, exhaustiveDependencyList = false) {
+            module("my-app.commonMain") {
+                targetPlatform(jvm, js) // must not be (jvm, js, native)
+            }
+
+            module("my-app.includedIntoJvm") {
+                targetPlatform(jvm) // !
+            }
+
+            module("my-app.includedIntoJvmAndJs") {
+                targetPlatform(jvm, js) // !
+            }
+        }
+    }
+
+    @Test
+    @PluginTargetVersions(gradleVersionForLatestPlugin = mppImportTestMinVersionForMaster)
+    fun testDefaultSourceSetDependsOnDefaultSourceSet() {
+        configureByFiles()
+        importProject()
+
+        val jvm = JvmPlatforms.defaultJvmPlatform
+        val js = JsPlatforms.defaultJsPlatform
+        val native = NativePlatforms.unspecifiedNativePlatform
+
+        checkProjectStructure(exhaustiveModuleList = false, exhaustiveSourceSourceRootList = false, exhaustiveDependencyList = false) {
+            module("my-app.commonMain") {
+                targetPlatform(jvm, js) // must not be (jvm, js, native)
+            }
+
+            module("my-app.intermediateBetweenJsAndCommon") {
+                targetPlatform(jvm, js) // must not be (jvm, js, native)
+            }
+
+            module("my-app.jsMain") {
+                targetPlatform(js) // must not be (jvm, js)
+            }
+
+            module("my-app.jvmMain") {
+                targetPlatform(jvm)
+            }
+        }
+    }
+
+    @Test
+    @PluginTargetVersions(gradleVersionForLatestPlugin = mppImportTestMinVersionForMaster)
+    fun testDefaultSourceSetIncludedIntoAnotherCompilationDirectly() {
+        configureByFiles()
+        importProject()
+
+        val jvm = JvmPlatforms.defaultJvmPlatform
+        val js = JsPlatforms.defaultJsPlatform
+
+        checkProjectStructure(exhaustiveModuleList = false, exhaustiveSourceSourceRootList = false, exhaustiveDependencyList = false) {
+            module("my-app.jvmMain") {
+                targetPlatform(jvm) // must not be (jvm, js)
+            }
+
+            module("my-app.jsMain") {
+                targetPlatform(js)
+            }
+        }
+    }
+
+    @Test
+    @PluginTargetVersions(gradleVersionForLatestPlugin = mppImportTestMinVersionForMaster)
+    fun testSourceSetsWithDependsOnButNotIncludedIntoCompilation() {
+        configureByFiles()
+        importProject()
+
+        val jvm = JvmPlatforms.defaultJvmPlatform
+        val js = JsPlatforms.defaultJsPlatform
+        val native = NativePlatforms.unspecifiedNativePlatform
+
+        checkProjectStructure(exhaustiveModuleList = false, exhaustiveSourceSourceRootList = false, exhaustiveDependencyList = false) {
+
+            // (jvm, js, native) is highly undesirable
+            module("my-app.danglingOnJvm") {
+                targetPlatform(jvm, js)
+            }
+
+            module("my-app.commonMain") {
+                targetPlatform(jvm, js)
+            }
+
+            module("my-app.danglingOnCommon") {
+                targetPlatform(jvm, js)
+            }
+
+            module("my-app.danglingOnJvmAndJs") {
+                targetPlatform(jvm, js)
+            }
+        }
+    }
+
+    @Test
+    @PluginTargetVersions(gradleVersionForLatestPlugin = mppImportTestMinVersionForMaster)
+    fun testCustomAddToCompilationPlusDependsOn() {
+        configureByFiles()
+        importProject()
+
+        val jvm = JvmPlatforms.defaultJvmPlatform
+
+        checkProjectStructure(exhaustiveModuleList = false, exhaustiveSourceSourceRootList = false, exhaustiveDependencyList = false) {
+            module("my-app.includedIntoJvm") {
+                targetPlatform(jvm) // !
+            }
+
+            module("my-app.pseudoOrphan") {
+                targetPlatform(jvm) // !
+            }
+        }
+    }
+
     private fun checkProjectStructure(
         exhaustiveModuleList: Boolean = true,
         exhaustiveSourceSourceRootList: Boolean = true,

idea/testData/gradle/hierarchicalMultiplatformImport/customAddToCompilationPlusDependsOn/build.gradle.kts

@@ -0,0 +1,32 @@
+buildscript {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+repositories {
+    {{kts_kotlin_plugin_repositories}}
+}
+
+plugins {
+    kotlin("multiplatform").version("{{kotlin_plugin_version}}")
+}
+
+group = "project"
+version = "1.0"
+
+kotlin {
+    jvm() 
+    js()
+
+    sourceSets {
+        val pseudoOrphan by creating {
+        }
+
+        val includedIntoJvm by creating {
+            dependsOn(pseudoOrphan)
+        }
+
+        jvm().compilations["main"].source(includedIntoJvm)
+    }
+}

idea/testData/gradle/hierarchicalMultiplatformImport/customAddToCompilationPlusDependsOn/gradle.properties

@@ -0,0 +1 @@
+kotlin.mpp.enableGranularSourceSetsMetadata=true

idea/testData/gradle/hierarchicalMultiplatformImport/customAddToCompilationPlusDependsOn/settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+rootProject.name = "my-app"
+
+enableFeaturePreview("GRADLE_METADATA")

idea/testData/gradle/hierarchicalMultiplatformImport/defaultSourceSetDependsOnDefaultSourceSet/build.gradle.kts

@@ -0,0 +1,37 @@
+buildscript {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+repositories {
+    {{kts_kotlin_plugin_repositories}}
+}
+
+plugins {
+    kotlin("multiplatform").version("{{kotlin_plugin_version}}")
+}
+
+group = "project"
+version = "1.0"
+
+kotlin {
+    jvm() 
+    js()
+
+    sourceSets {
+        val commonMain by getting {}
+
+        val intermediateBetweenJsAndCommon by creating {
+            dependsOn(commonMain)
+        }
+
+        val jsMain by getting {
+            dependsOn(intermediateBetweenJsAndCommon)
+        }
+
+        val jvmMain by getting {
+            dependsOn(jsMain)
+        }
+    }
+}

idea/testData/gradle/hierarchicalMultiplatformImport/defaultSourceSetDependsOnDefaultSourceSet/gradle.properties

@@ -0,0 +1 @@
+kotlin.mpp.enableGranularSourceSetsMetadata=true

idea/testData/gradle/hierarchicalMultiplatformImport/defaultSourceSetDependsOnDefaultSourceSet/settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+rootProject.name = "my-app"
+
+enableFeaturePreview("GRADLE_METADATA")

idea/testData/gradle/hierarchicalMultiplatformImport/defaultSourceSetIncludedIntoAnotherCompilationDirectly/build.gradle.kts

@@ -0,0 +1,27 @@
+buildscript {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+repositories {
+    {{kts_kotlin_plugin_repositories}}
+}
+
+plugins {
+    kotlin("multiplatform").version("{{kotlin_plugin_version}}")
+}
+
+group = "project"
+version = "1.0"
+
+kotlin {
+    jvm() 
+    js()
+
+    sourceSets {
+        val jvmMain by getting { }
+
+        js().compilations["main"].source(jvmMain)
+    }
+}

idea/testData/gradle/hierarchicalMultiplatformImport/defaultSourceSetIncludedIntoAnotherCompilationDirectly/gradle.properties

@@ -0,0 +1 @@
+kotlin.mpp.enableGranularSourceSetsMetadata=true

idea/testData/gradle/hierarchicalMultiplatformImport/defaultSourceSetIncludedIntoAnotherCompilationDirectly/settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+rootProject.name = "my-app"
+
+enableFeaturePreview("GRADLE_METADATA")

idea/testData/gradle/hierarchicalMultiplatformImport/orphanSourceSet/build.gradle.kts

@@ -0,0 +1,25 @@
+buildscript {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+repositories {
+    {{kts_kotlin_plugin_repositories}}
+}
+
+plugins {
+    kotlin("multiplatform").version("{{kotlin_plugin_version}}")
+}
+
+group = "project"
+version = "1.0"
+
+kotlin {
+    jvm() 
+    js()
+
+    sourceSets {
+        val orphan by creating { }
+    }
+}

idea/testData/gradle/hierarchicalMultiplatformImport/orphanSourceSet/gradle.properties

@@ -0,0 +1 @@
+kotlin.mpp.enableGranularSourceSetsMetadata=true

idea/testData/gradle/hierarchicalMultiplatformImport/orphanSourceSet/settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+rootProject.name = "my-app"
+
+enableFeaturePreview("GRADLE_METADATA")

idea/testData/gradle/hierarchicalMultiplatformImport/sourceSetIncludedIntoCompilationDirectly/build.gradle.kts

@@ -0,0 +1,31 @@
+buildscript {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+repositories {
+    {{kts_kotlin_plugin_repositories}}
+}
+
+plugins {
+    kotlin("multiplatform").version("{{kotlin_plugin_version}}")
+}
+
+group = "project"
+version = "1.0"
+
+kotlin {
+    jvm() 
+    js()
+
+    sourceSets {
+        val includedIntoJvm by creating { }
+        val includedIntoJvmAndJs by creating { }
+
+        jvm().compilations["main"].source(includedIntoJvm)
+
+        jvm().compilations["main"].source(includedIntoJvmAndJs)
+        js().compilations["main"].source(includedIntoJvmAndJs)
+    }
+}

idea/testData/gradle/hierarchicalMultiplatformImport/sourceSetIncludedIntoCompilationDirectly/gradle.properties

@@ -0,0 +1 @@
+kotlin.mpp.enableGranularSourceSetsMetadata=true

idea/testData/gradle/hierarchicalMultiplatformImport/sourceSetIncludedIntoCompilationDirectly/settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+rootProject.name = "my-app"
+
+enableFeaturePreview("GRADLE_METADATA")

idea/testData/gradle/hierarchicalMultiplatformImport/sourceSetsWithDependsOnButNotIncludedIntoCompilation/build.gradle.kts

@@ -0,0 +1,40 @@
+buildscript {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+repositories {
+    {{kts_kotlin_plugin_repositories}}
+}
+
+plugins {
+    kotlin("multiplatform").version("{{kotlin_plugin_version}}")
+}
+
+group = "project"
+version = "1.0"
+
+kotlin {
+    jvm() 
+    js()
+
+    sourceSets {
+        val commonMain by getting { }
+        val jvmMain by getting { }
+        val jsMain by getting { }
+
+        val danglingOnJvm by creating {
+            dependsOn(jvmMain)
+        }
+
+        val danglingOnCommon by creating {
+            dependsOn(commonMain)
+        }
+
+        val danglingOnJvmAndJs by creating {
+            dependsOn(jvmMain)
+            dependsOn(jsMain)
+        }
+    }
+}

idea/testData/gradle/hierarchicalMultiplatformImport/sourceSetsWithDependsOnButNotIncludedIntoCompilation/gradle.properties

@@ -0,0 +1 @@
+kotlin.mpp.enableGranularSourceSetsMetadata=true

idea/testData/gradle/hierarchicalMultiplatformImport/sourceSetsWithDependsOnButNotIncludedIntoCompilation/settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        {{kts_kotlin_plugin_repositories}}
+    }
+}
+
+rootProject.name = "my-app"
+
+enableFeaturePreview("GRADLE_METADATA")