Add JS specific proto comparison test

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -1232,6 +1232,7 @@ fun main(args: Array<String>) {
 
         testClass<AbstractJsProtoComparisonTest> {
             commonProtoComparisonTests()
+            model("comparison/jsOnly", extension = null, excludeParentDirs = true)
         }
     }
 

jps-plugin/jps-tests/test/org/jetbrains/kotlin/jps/incremental/JsProtoComparisonTestGenerated.java

@@ -272,4 +272,19 @@ public class JsProtoComparisonTestGenerated extends AbstractJsProtoComparisonTes
             doTest(fileName);
         }
     }
+
+    @TestMetadata("jps-plugin/testData/comparison/jsOnly")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class JsOnly extends AbstractJsProtoComparisonTest {
+        public void testAllFilesPresentInJsOnly() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("jps-plugin/testData/comparison/jsOnly"), Pattern.compile("^([^\\.]+)$"), TargetBackend.ANY, true);
+        }
+
+        @TestMetadata("externals")
+        public void testExternals() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("jps-plugin/testData/comparison/jsOnly/externals/");
+            doTest(fileName);
+        }
+    }
 }

jps-plugin/testData/comparison/jsOnly/externals/new.kt

@@ -0,0 +1,15 @@
+package test
+
+external class ExternalClass {
+    fun addedExternalFun()
+    val addedExternalVal: Int
+}
+
+external class ClassBecameExternal
+class ClassBecameNonExternal
+
+external fun addedExternalFun()
+external val addedExternalVal: Int
+
+external fun funBecameExternal()
+fun funBecameNonExternal() {}

jps-plugin/testData/comparison/jsOnly/externals/old.kt

@@ -0,0 +1,15 @@
+package test
+
+external class ExternalClass {
+    fun removedExternalFun()
+    val removedExternalVal: Int
+}
+
+class ClassBecameExternal
+external class ClassBecameNonExternal
+
+external fun removedExternalFun()
+external val removedExternalVal: Int
+
+fun funBecameExternal() {}
+external fun funBecameNonExternal()

jps-plugin/testData/comparison/jsOnly/externals/result.out

@@ -0,0 +1,10 @@
+PROTO DIFFERENCE in test/ClassBecameExternal: FLAGS
+CHANGES in test/ClassBecameExternal: CLASS_SIGNATURE
+PROTO DIFFERENCE in test/ClassBecameNonExternal: FLAGS
+CHANGES in test/ClassBecameNonExternal: CLASS_SIGNATURE
+PROTO DIFFERENCE in test/ExternalClass: FUNCTION_LIST, PROPERTY_LIST
+CHANGES in test/ExternalClass: MEMBERS
+    [addedExternalFun, addedExternalVal, removedExternalFun, removedExternalVal]
+PROTO DIFFERENCE in test/MainKt: FUNCTION_LIST, PROPERTY_LIST
+CHANGES in test/MainKt: MEMBERS
+    [addedExternalFun, addedExternalVal, funBecameExternal, funBecameNonExternal, removedExternalFun, removedExternalVal]