Native: support writing unit tests for Interop/Indexer

kotlin-native/Interop/Indexer/build.gradle.kts

@@ -152,6 +152,8 @@ sourceSets {
 dependencies {
     compile(project(":kotlin-stdlib"))
     compile(project(":kotlin-native:Interop:Runtime"))
+
+    testImplementation(kotlin("test-junit"))
 }
 
 val nativelibs = project.tasks.create<Copy>("nativelibs") {
@@ -180,6 +182,25 @@ tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach
     }
 }
 
+tasks.withType<Test>().configureEach {
+    val projectsWithNativeLibs = listOf(
+            project, // Current one.
+            project(":kotlin-native:Interop:Runtime")
+    )
+    dependsOn(projectsWithNativeLibs.map { "${it.path}:nativelibs" })
+    systemProperty("java.library.path", projectsWithNativeLibs.joinToString(File.pathSeparator) {
+        File(it.buildDir, "nativelibs").absolutePath
+    })
+
+    systemProperty("kotlin.native.llvm.libclang", "$llvmDir/" + if (HostManager.hostIsMingw) {
+        "bin/libclang.dll"
+    } else {
+        "lib/${System.mapLibraryName("clang")}"
+    })
+
+    systemProperty("kotlin.native.interop.indexer.temp", File(buildDir, "testTemp"))
+}
+
 tasks.matching { it.name == "linkClangstubsSharedLibrary" }.all {
     dependsOn(libclangextTask)
     inputs.dir(libclangextDir)

kotlin-native/Interop/Indexer/src/test/kotlin/org/jetbrains/kotlin/native/interop/indexer/IndexerTests.kt

@@ -0,0 +1,27 @@
+/*
+ * 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.native.interop.indexer
+
+import java.io.File
+
+open class IndexerTests {
+    init {
+        System.load(System.getProperty("kotlin.native.llvm.libclang"))
+    }
+
+    class TempFiles(name: String) {
+        private val tempRootDir = System.getProperty("kotlin.native.interop.indexer.temp") ?: System.getProperty("java.io.tmpdir") ?: "."
+
+        val directory: File = File(tempRootDir, name).canonicalFile.also {
+            it.mkdirs()
+        }
+
+        fun file(relativePath: String, contents: String): File = File(directory, relativePath).canonicalFile.apply {
+            parentFile.mkdirs()
+            writeText(contents)
+        }
+    }
+}

kotlin-native/backend.native/tests/build.gradle

@@ -201,6 +201,7 @@ run {
     // Add regular gradle test tasks
     dependsOn(tasksOf(Test))
     dependsOn(tasksOf(CoverageTest))
+    dependsOn(":kotlin-native:Interop:Indexer:check")
 }
 
 task sanity {
@@ -210,6 +211,7 @@ task sanity {
     // Add regular gradle test tasks
     dependsOn(tasksOf(Test))
     dependsOn(tasksOf(CoverageTest))
+    dependsOn(":kotlin-native:Interop:Indexer:check")
 }
 
 // Collect reports in one json.