K2JS: test that UNUSED_PARAM warnings inside native declarations and all warnings from stdlib was suppressed.

compiler/tests/org/jetbrains/jet/cli/KotlincExecutableTestGenerated.java

@@ -191,6 +191,12 @@ public class KotlincExecutableTestGenerated extends AbstractKotlincExecutableTes
             doJsTest(fileName);
         }
 
+        @TestMetadata("nativeDeclarations.args")
+        public void testNativeDeclarations() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/cli/js/nativeDeclarations.args");
+            doJsTest(fileName);
+        }
+
         @TestMetadata("outputPostfixFileNotFound.args")
         public void testOutputPostfixFileNotFound() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/cli/js/outputPostfixFileNotFound.args");

compiler/tests/org/jetbrains/jet/cli/js/K2JsCliTest.java

@@ -48,4 +48,11 @@ public class K2JsCliTest extends CliBaseTest {
     public void jsHelp() throws Exception {
         executeCompilerCompareOutputJS();
     }
+
+    @Test
+    public void nativeDeclarations() throws Exception {
+        executeCompilerCompareOutputJS();
+
+        Assert.assertTrue(new File(tmpdir.getTmpDir(), "out.js").isFile());
+    }
 }