Add test for KMM Wizard

idea/idea-new-project-wizard/tests/org/jetbrains/kotlin/tools/projectWizard/wizard/AbstractNewWizardProjectImportTest.kt

@@ -86,7 +86,7 @@ abstract class AbstractNewWizardProjectImportTest : PlatformTestCase() {
         wizard.apply(projectDependentServices, GenerationPhase.ALL).assertSuccess()
     }
 
-    private fun prepareGradleBuildSystem(directory: Path) {
+    protected fun prepareGradleBuildSystem(directory: Path) {
         com.intellij.openapi.components.ServiceManager.getService(project, GradleSettings::class.java)?.apply {
             isOfflineWork = GradleEnvironment.Headless.GRADLE_OFFLINE?.toBoolean() ?: isOfflineWork
             serviceDirectoryPath = GradleEnvironment.Headless.GRADLE_SERVICE_DIRECTORY ?: serviceDirectoryPath

libraries/tools/new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/core/service/FileSystemWizardService.kt

@@ -1,5 +1,11 @@
+/*
+ * Copyright 2010-2020 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.tools.projectWizard.core.service
 
+import org.jetbrains.kotlin.tools.projectWizard.core.Success
 import org.jetbrains.kotlin.tools.projectWizard.core.TaskResult
 import org.jetbrains.kotlin.tools.projectWizard.core.computeM
 import org.jetbrains.kotlin.tools.projectWizard.core.safe
@@ -13,6 +19,7 @@ interface FileSystemWizardService : WizardService {
 
 class OsFileSystemWizardService : FileSystemWizardService, IdeaIndependentWizardService {
     override fun createFile(path: Path, text: String) = computeM {
+        if (path.toFile().exists()) return@computeM Success(Unit)
         createDirectory(path.parent).ensure()
         safe { Files.createFile(path.normalize()).toFile().writeText(text) }
     }