Adding ES6 module tests equivalent to goog.module tests in CheckJSDoc…

…StyleTest of the LINTCHECKS pass. Part of verification/adding of ES6 module compatibility to compiler.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=160205724

test/com/google/javascript/jscomp/lint/CheckJSDocStyleTest.java

@@ -363,11 +363,31 @@ public void testMissingJsDoc_googModule() {
     testWarning("goog.module('a.b.c'); var f = function() {};", MISSING_JSDOC);
   }
 
+  public void testMissingJsDoc_ES6Module01() {
+    testWarning("export default abc; function f() {}", MISSING_JSDOC);
+  }
+
+  public void testMissingJsDoc_ES6Module02() {
+    testWarning("export default abc; var f = function() {};", MISSING_JSDOC);
+  }
+
+  public void testMissingJsDoc_ES6Module03() {
+    testWarning("export function f() {};", MISSING_JSDOC);
+  }
+
   public void testMissingJsDoc_googModule_noWarning() {
     testSame("goog.module('a.b.c'); /** @type {function()} */ function f() {}");
     testSame("goog.module('a.b.c'); /** @type {function()} */ var f = function() {};");
   }
 
+  public void testMissingJsDoc_ES6Module_noWarning01() {
+    testSame("export default abc; /** @type {function()} */ function f() {}");
+  }
+
+  public void testMissingJsDoc_ES6Module_noWarning02() {
+    testSame("export default abc; /** @type {function()} */ var f = function() {};");
+  }
+
   private static String inIIFE(String js) {
     return "(function() {\n" + js + "\n})()";
   }