[TEST] Move generated js compiler tests to test-gen directories

js/js.tests/build.gradle.kts

@@ -4,6 +4,7 @@ import de.undercouch.gradle.tasks.download.Download
 import org.gradle.internal.os.OperatingSystem
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinUsages
+import org.jetbrains.kotlin.ideaExt.idea
 
 plugins {
     kotlin("jvm")
@@ -96,11 +97,22 @@ dependencies {
     antLauncherJar(toolsJar())
 }
 
+val generationRoot = projectDir.resolve("tests-gen")
+
 sourceSets {
-    "main" {}
-    "test" { projectDefault() }
+    "main" { }
+    "test" {
+        projectDefault()
+        this.java.srcDir(generationRoot.name)
+    }
 }
 
+if (kotlinBuildProperties.isInJpsBuildIdeaSync) {
+    apply(plugin = "idea")
+    idea {
+        this.module.generatedSourceDirs.add(generationRoot)
+    }
+}
 
 fun Test.setUpJsBoxTests(jsEnabled: Boolean, jsIrEnabled: Boolean) {
     dependsOn(":dist")