Add test for protocol buffer hash code

test/hash_code_test.dart

+#!/usr/bin/env dart
+// Copyright (c) 2013, 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 hash_code_tests;
+
+import 'dart:typed_data';
+
+import 'package:fixnum/fixnum.dart';
+import 'package:protobuf/protobuf.dart';
+import 'package:unittest/unittest.dart';
+
+import '../out/protos/google/protobuf/unittest.pb.dart';
+
+void main() {
+  test('testHashCodeEmptyMessage', () {
+    var m1 = new TestAllTypes();
+    var m2 = new TestAllTypes();
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeOptionalInt32', () {
+    var m1 = new TestAllTypes()..optionalInt32 = 42;
+    var m2 = new TestAllTypes()..optionalInt32 = 42;
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.optionalInt32 = 43;
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.optionalInt32 = 43;
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeOptionalInt64', () {
+    var m1 = new TestAllTypes()..optionalInt64 = new Int64(42);
+    var m2 = new TestAllTypes()..optionalInt64 = new Int64(42);
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.optionalInt64 = new Int64(43);
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.optionalInt64 = new Int64(43);
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeOptionalString', () {
+    var m1 = new TestAllTypes()..optionalString = "Dart";
+    var m2 = new TestAllTypes()..optionalString = "Dart";
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.optionalString = "JavaScript";
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.optionalString = "JavaScript";
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeOptionalEnum', () {
+    var m1 = new TestAllTypes()
+        ..optionalNestedEnum = TestAllTypes_NestedEnum.BAR;
+    var m2 = new TestAllTypes()
+        ..optionalNestedEnum = TestAllTypes_NestedEnum.BAR;
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.optionalNestedEnum = TestAllTypes_NestedEnum.BAZ;
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.optionalNestedEnum = TestAllTypes_NestedEnum.BAZ;
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeRepeatedInt32', () {
+    var m1 = new TestAllTypes();
+    var m2 = new TestAllTypes();
+    m1.repeatedInt32.add(42);
+    m2.repeatedInt32.add(42);
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeRepeatedInt64', () {
+    var m1 = new TestAllTypes();
+    var m2 = new TestAllTypes();
+    m1.repeatedInt32.add(42);
+    m2.repeatedInt32.add(42);
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.repeatedInt32.add(43);
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.repeatedInt32.add(43);
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.repeatedInt32.clear();
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.repeatedInt32.clear();
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeRepeatedString', () {
+    var m1 = new TestAllTypes();
+    var m2 = new TestAllTypes();
+    m1.repeatedString.add("Dart");
+    m2.repeatedString.add("Dart");
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.repeatedString.add("JavaScript");
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.repeatedString.add("JavaScript");
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.repeatedString.clear();
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.repeatedString.clear();
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeRepeatedEnum', () {
+    var m1 = new TestAllTypes();
+    var m2 = new TestAllTypes();
+    m1.repeatedNestedEnum.add(TestAllTypes_NestedEnum.BAR);
+    m2.repeatedNestedEnum.add(TestAllTypes_NestedEnum.BAR);
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.repeatedNestedEnum.add(TestAllTypes_NestedEnum.BAZ);
+    expect(m1.hashCode, isNot(m2.hashCode));
+
+    m2.repeatedNestedEnum.add(TestAllTypes_NestedEnum.BAZ);
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeUnknownFields', () {
+    var m1 = new TestAllTypes();
+    var m2 = new TestAllTypes();
+    m1.unknownFields.mergeVarintField(12345, new Int64(123));
+    m2.unknownFields.mergeVarintField(12345, new Int64(123));
+    expect(m1.hashCode, m2.hashCode);
+  });
+
+  test('testHashCodeCombined', () {
+    var m1 = new TestAllTypes()
+        ..optionalInt32 = 42
+        ..optionalInt64 = new Int64(42)
+        ..optionalString = "Dart"
+        ..optionalNestedEnum = TestAllTypes_NestedEnum.BAR;
+      var m2 = new TestAllTypes()
+        ..optionalInt32 = 42
+        ..optionalInt64 = new Int64(42)
+        ..optionalString = "Dart"
+        ..optionalNestedEnum = TestAllTypes_NestedEnum.BAR;
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.repeatedInt32..add(42)..add(43);
+    m2.repeatedInt32..add(42)..add(43);
+    m1.repeatedInt64..add(new Int64(42))..add(new Int64(43));
+    m2.repeatedInt64..add(new Int64(42))..add(new Int64(43));
+    m1.repeatedString..add("Dart")..add("JavaScript");
+    m2.repeatedString..add("Dart")..add("JavaScript");
+    m1.repeatedNestedEnum
+        ..add(TestAllTypes_NestedEnum.BAR)
+        ..add(TestAllTypes_NestedEnum.BAZ);
+    m2.repeatedNestedEnum
+        ..add(TestAllTypes_NestedEnum.BAR)
+        ..add(TestAllTypes_NestedEnum.BAZ);
+    expect(m1.hashCode, m2.hashCode);
+
+    m1.unknownFields.mergeVarintField(12345, new Int64(123));
+    m2.unknownFields.mergeVarintField(12345, new Int64(123));
+    expect(m1.hashCode, m2.hashCode);
+    expect(m1.hashCode, m2.hashCode);
+  });
+}