Add FileState.hasMixin/hasMixinLibrary properties.

pkg/front_end/test/src/incremental/file_state_test.dart

Index: pkg/front_end/test/src/incremental/file_state_test.dart
diff --git a/pkg/front_end/test/src/incremental/file_state_test.dart b/pkg/front_end/test/src/incremental/file_state_test.dart
index 9e9f391cdbb9f3246d7f021711017fc15b8ad3d5..9feda3eaf39afe36647f43edf2dbe8ab469963d9 100644
--- a/pkg/front_end/test/src/incremental/file_state_test.dart
+++ b/pkg/front_end/test/src/incremental/file_state_test.dart
@@ -284,6 +284,105 @@ export "c.dart" show A, B, C, D hide C show A, D;
     }
   }
 
+  test_hasMixin_false() async {
+    writeFile(
+        '/a.dart',
+        r'''
+class A {}
+class B extends Object with A {}
+''');
+    var uri = writeFile(
+        '/test.dart',
+        r'''
+import 'a.dart';
+class T1 extends A {}
+class T2 extends B {}
+''');
+    FileState file = await fsState.getFile(uri);
+    expect(file.hasMixin, isFalse);
+  }
+
+  test_hasMixin_true() async {
+    var uri = writeFile(
+        '/test.dart',
+        r'''
+class A {}
+class B extends Object with A {}
+''');
+    FileState file = await fsState.getFile(uri);
+    expect(file.hasMixin, isTrue);
+  }
+
+  test_hasMixinLibrary_false() async {
+    var partUri = writeFile(
+        '/part.dart',
+        r'''
+part of test;
+class A {}
+''');
+    var libUri = writeFile(
+        '/test.dart',
+        r'''
+library test;
+part 'part.dart';
+class B extends A {}
+''');
+
+    FileState part = await fsState.getFile(partUri);
+    FileState lib = await fsState.getFile(libUri);
+
+    expect(part.hasMixin, isFalse);
+    expect(lib.hasMixin, isFalse);
+    expect(lib.hasMixinLibrary, isFalse);
+  }
+
+  test_hasMixinLibrary_true_inDefiningUnit() async {
+    var partUri = writeFile(
+        '/part.dart',
+        r'''
+part of test;
+class A {}
+''');
+    var libUri = writeFile(
+        '/test.dart',
+        r'''
+library test;
+part 'part.dart';
+class B extends Object with A {}
+''');
+
+    FileState part = await fsState.getFile(partUri);
+    FileState lib = await fsState.getFile(libUri);
+
+    expect(part.hasMixin, isFalse);
+    expect(lib.hasMixin, isTrue);
+    expect(lib.hasMixinLibrary, isTrue);
+  }
+
+  test_hasMixinLibrary_true_inPart() async {
+    var partUri = writeFile(
+        '/part.dart',
+        r'''
+part of test;
+class A {}
+class B extends Object with A {}

[ahe, 2017/06/12 19:22:03]

Consider adding a test for a named mixin application as well:

class Named = Object with Mixin {}

[scheglov, 2017/06/12 19:43:19]

Done.

+''');
+    var libUri = writeFile(
+        '/test.dart',
+        r'''
+library test;
+part 'part.dart';
+class C {}
+''');
+
+    FileState part = await fsState.getFile(partUri);
+    FileState lib = await fsState.getFile(libUri);
+
+    expect(part.hasMixin, isTrue);
+    expect(lib.hasMixin, isFalse);
+    expect(lib.hasMixinLibrary, isTrue);
+  }
+
   test_newFileListener() async {
     var a = writeFile('/a.dart', '');
     var b = writeFile('/b.dart', '');