Change how to set the Dart name of a field

test/names_test.dart

+// Copyright (c) 2016, 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 dart_name_test;
+
+import 'package:test/test.dart';
+import 'package:protoc_plugin/names.dart' as names;
+import 'package:protoc_plugin/src/descriptor.pb.dart';
+import 'package:protoc_plugin/src/dart_options.pb.dart';
+
+import '../out/protos/dart_name.pb.dart';
+
+Matcher throwsMessage(String msg) => throwsA(new _ToStringMatcher(equals(msg)));
+
+class _ToStringMatcher extends CustomMatcher {
+  _ToStringMatcher(Matcher matcher)
+      : super("object where toString() returns", "toString()", matcher);
+  featureValueOf(actual) => actual.toString();
+}
+
+void main() {
+  test('Can access a field that was renamed using dart_name option', () {
+    var msg = new DartName();
+    expect(msg.hasRenamedField(), false);
+    msg.renamedField = 'test';
+    expect(msg.hasRenamedField(), true);
+    expect(msg.renamedField, 'test');
+    msg.clearRenamedField();
+    expect(msg.hasRenamedField(), false);
+  });
+
+  test('Can swap field names using dart_name option', () {
+    var msg = new SwapNames();
+    msg.first = "one";
+    msg.second = "two";
+    expect(msg.getField(1), "two");
+    expect(msg.getField(2), "one");
+  });
+
+  test("Can take another field's name using dart_name option", () {
+    var msg = new TakeExistingName();
+    msg.first = "one";
+    expect(msg.getField(2), "one");

[Søren Gjesse, 2016/06/09 09:07:13]

Also test the original first field (called first_1 now?)

[skybrian, 2016/06/09 19:10:47]

Done.

+  });
+
+  test('Throws exception for dart_name option containing a space', () {
+    var descriptor = new DescriptorProto()
+      ..name = 'Example'
+      ..field.addAll([stringField("first", 1, "hello world"),]);

[frederikmutzel, 2016/06/09 07:50:28]

just add? (also below)

[skybrian, 2016/06/09 19:10:47]

Done.

+    expect(() {
+      names.messageFieldNames(descriptor);
+    },
+        throwsMessage("Example.first: dart_name option is invalid: "
+            "'hello world' is not a valid Dart field name"));
+  });
+
+  test('Throws exception for dart_name option set to reserved word', () {
+    var descriptor = new DescriptorProto()
+      ..name = 'Example'
+      ..field.addAll([stringField("first", 1, "class"),]);
+    expect(() {
+      names.messageFieldNames(descriptor);
+    },
+        throwsMessage("Example.first: "
+            "dart_name option is invalid: 'class' is already used"));
+  });
+
+  test('Throws exception for duplicate dart_name options', () {
+    var descriptor = new DescriptorProto()
+      ..name = 'Example'
+      ..field.addAll([
+        stringField("first", 1, "renamed"),
+        stringField("second", 2, "renamed"),
+      ]);
+    expect(() {
+      names.messageFieldNames(descriptor);
+    },
+        throwsMessage("Example.second: "
+            "dart_name option is invalid: 'renamed' is already used"));
+  });
+}
+
+FieldDescriptorProto stringField(String name, int number, String dartName) {
+  return new FieldDescriptorProto()
+    ..name = name
+    ..number = number
+    ..label = FieldDescriptorProto_Label.LABEL_OPTIONAL
+    ..type = FieldDescriptorProto_Type.TYPE_STRING
+    ..options =
+        (new FieldOptions()..setExtension(Dart_options.dartName, dartName));
+}