[TEST] Move generated compiler tests to test-gen directory

compiler/build.gradle.kts

@@ -1,4 +1,5 @@
 import org.jetbrains.kotlin.gradle.dsl.KotlinCompile
+import org.jetbrains.kotlin.ideaExt.idea
 import java.io.File
 
 plugins {
@@ -69,10 +70,20 @@ dependencies {
     antLauncherJar(toolsJar())
 }
 
+val generationRoot = projectDir.resolve("tests-gen")
+
 sourceSets {
     "main" {}
     "test" {
         projectDefault()
+        this.java.srcDir(generationRoot.name)
+    }
+}
+
+if (kotlinBuildProperties.isInJpsBuildIdeaSync) {
+    apply(plugin = "idea")
+    idea {
+        this.module.generatedSourceDirs.add(generationRoot)
     }
 }
 

compiler/tests/org/jetbrains/kotlin/generators/tests/GenerateCompilerTests.kt

@@ -69,7 +69,7 @@ fun main(args: Array<String>) {
     val excludedFirTestdataPattern = "^(.+)\\.fir\\.kts?\$"
 
     testGroupSuite(args) {
-        testGroup("compiler/tests", "compiler/testData") {
+        testGroup("compiler/tests-gen", "compiler/testData") {
             testClass<AbstractDiagnosticsTestWithFirValidation>(suiteTestClassName = "DiagnosticsTestGenerated") {
                 model("diagnostics/tests", pattern = "^(.*)\\.kts?$", excludedPattern = excludedFirTestdataPattern)
                 model("codegen/box/diagnostics")
@@ -590,7 +590,7 @@ fun main(args: Array<String>) {
         }
 
         testGroup(
-            "compiler/tests", "compiler/testData",
+            "compiler/tests-gen", "compiler/testData",
             testRunnerMethodName = "runTestWithCustomIgnoreDirective",
             additionalRunnerArguments = listOf("\"// IGNORE_BACKEND_MULTI_MODULE: \"")
         ) {