Moved the tests for the element model into locations corresponding to the implementation

pkg/analyzer/test/dart/element/element_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library analyzer.test.dart.element.element_test;
+
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/src/generated/testing/element_factory.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../generated/test_support.dart';
+import '../../reflective_tests.dart';
+import '../../utils.dart';
+
+main() {
+  initializeTestEnvironment();
+  runReflectiveTests(ElementKindTest);
+}
+
+@reflectiveTest
+class ElementKindTest extends EngineTestCase {
+  void test_of_nonNull() {
+    expect(ElementKind.of(ElementFactory.classElement2("A")),
+        same(ElementKind.CLASS));
+  }
+
+  void test_of_null() {
+    expect(ElementKind.of(null), same(ElementKind.ERROR));
+  }
+}