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packages/analyzer/test/enum_test.dart

Index: packages/analyzer/test/enum_test.dart
diff --git a/packages/analyzer/test/enum_test.dart b/packages/analyzer/test/enum_test.dart
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+// 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 test.enums;
+
+import 'dart:mirrors';
+
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/html.dart' as html;
+import 'package:analyzer/src/generated/java_core.dart';
+import 'package:analyzer/src/generated/resolver.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart';
+import 'package:unittest/unittest.dart';
+
+import 'generated/ast_test.dart';
+import 'reflective_tests.dart';
+import 'utils.dart';
+
+void main() {
+  initializeTestEnvironment();
+  runReflectiveTests(EnumTest);
+}
+
+@reflectiveTest
+class EnumTest {
+  void test_AnalysisLevel() {
+    new EnumTester<AnalysisLevel>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_AssignmentKind() {
+    new EnumTester<AssignmentKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_CacheState() {
+    new EnumTester<CacheState>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_ElementKind() {
+    new EnumTester<ElementKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_ErrorProperty() {
+    new EnumTester<ErrorProperty>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_ErrorSeverity() {
+    new EnumTester<ErrorSeverity>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_ErrorType() {
+    new EnumTester<ErrorType>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_html_TokenType() {
+    new EnumTester<html.TokenType>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_INIT_STATE() {
+    new EnumTester<INIT_STATE>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_Modifier() {
+    new EnumTester<Modifier>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_ParameterKind() {
+    new EnumTester<ParameterKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_RedirectingConstructorKind() {
+    new EnumTester<RedirectingConstructorKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_RetentionPriority() {
+    new EnumTester<RetentionPriority>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_SourceKind() {
+    new EnumTester<SourceKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_SourcePriority() {
+    new EnumTester<SourcePriority>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_UriKind() {
+    new EnumTester<UriKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+
+  void test_WrapperKind() {
+    new EnumTester<WrapperKind>()
+      ..check_getters()
+      ..check_explicit_values();
+  }
+}
+
+/**
+ * Helper class for testing invariants of enumerated types.
+ */
+class EnumTester<C extends Enum> {
+  /**
+   * Set of getter names which should be ignored when looking for getters
+   * representing enum values.
+   */
+  Set<String> _ignoreGetters = new Set<String>();
+
+  EnumTester({List<String> ignoreGetters}) {
+    // Always ignore a getter called "values".
+    _ignoreGetters.add('values');
+
+    if (ignoreGetters != null) {
+      for (String getterName in ignoreGetters) {
+        _ignoreGetters.add(getterName);
+      }
+    }
+  }
+
+  /**
+   * Get a map from getter name to the value returned by the getter, for all
+   * static getters in [C] whose name isn't in [_ignoreGetters].
+   */
+  Map<String, C> get _getters {
+    Map<String, C> result = <String, C>{};
+    ClassMirror reflectedClass = reflectClass(C);
+    reflectedClass.staticMembers.forEach((Symbol symbol, MethodMirror method) {
+      if (!method.isGetter) {
+        return;
+      }
+      String name = MirrorSystem.getName(symbol);
+      if (_ignoreGetters.contains(name)) {
+        return;
+      }
+      C value = reflectedClass.getField(symbol).reflectee;
+      result[name] = value;
+    });
+    return result;
+  }
+
+  /**
+   * Check invariants on the list of enum values accessible via the static
+   * getter "values".
+   */
+  void check_explicit_values() {
+    ClassMirror reflectedClass = reflectClass(C);
+    List<C> values = reflectedClass.getField(#values).reflectee;
+    Map<C, int> reverseMap = <C, int>{};
+
+    // Check that "values" is a list of values of type C, with no duplicates.
+    expect(values, isList);
+    for (int i = 0; i < values.length; i++) {
+      C value = values[i];
+      expect(value, new isInstanceOf<C>(), reason: 'values[$i]');
+      if (reverseMap.containsKey(value)) {
+        fail('values[$i] and values[${reverseMap[value]}] both equal $value');
+      }
+      reverseMap[value] = i;
+    }
+
+    // Check that the set of values in the "values" list matches the set of
+    // values accessible via static fields.
+    expect(reverseMap.keys.toSet(), equals(_getters.values.toSet()));
+
+    // Make sure the order of the list matches the ordinal numbers.
+    for (int i = 0; i < values.length; i++) {
+      expect(values[i].ordinal, equals(i), reason: 'values[$i].ordinal');
+    }
+  }
+
+  /**
+   * Check invariants on the set of enum values accessible via the static
+   * getters defined in the class [C] (with the exception of a getter called
+   * "values").
+   */
+  void check_getters() {
+    Map<int, String> ordinals = <int, String>{};
+    int numValues = 0;
+
+    _getters.forEach((String name, C value) {
+      String reason = 'getter: $name';
+      ++numValues;
+
+      // Check the type of the value
+      expect(value, new isInstanceOf<C>(), reason: reason);
+
+      // Check that the name of the getter matches the name stored in the enum.
+      expect(value.name, equals(name), reason: reason);
+
+      // Check that there are no duplicate ordinals.
+      if (ordinals.containsKey(value.ordinal)) {
+        fail(
+            'Getters $name and ${ordinals[value.ordinal]} have ordinal value ${value.ordinal}');
+      }
+      ordinals[value.ordinal] = name;
+    });
+
+    // Check that the set of ordinals runs from 0 to N-1, where N is the number
+    // of enumerated values.
+    Set<int> expectedOrdinals = new Set<int>();
+    for (int i = 0; i < numValues; i++) {
+      expectedOrdinals.add(i);
+    }
+    expect(ordinals.keys.toSet(), equals(expectedOrdinals));
+  }
+}