Updated message formatting to be more compatible with Dart string interpolation.

tests/lib/i18n/message_format_test.dart

 /**
  * Copyright (c) 2012, 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('message_format_test');
 
 #import('../../../lib/i18n/message_format.dart');
+#import('../../../lib/i18n/intl.dart');
 #import('../../../lib/unittest/unittest.dart');
 
+
 /**
  * Tests the MessageFormat library in dart.
  */
 
 main() {
-  test('Message formatting', () {
-    var msg_format = new MessageFormat(
-      'Message telling user how many emails will be sent.',
-      '''{NUM_EMAILS_TO_SEND, plural,
-          =0 {unused plural form}
-          =1 {One email will be sent.}
-          other {# emails will be sent.}}''');
-    // TODO(efortuna): Uncomment when functioning correctly.
-    //Expect.stringEquals('5 emails will be sent.',
-    //                    msg_formatter.format({'NUM_EMAILS_TO_SEND' : 5})); 
+
+  test('Trivial message', () {
+    intl_helloWorld()
+        //@desc Hello world, doesn't get much simpler than this.
+        => "Hello World";
+    var msg_format = new MessageFormat();
+    var result = msg_format.formatMessage(intl_helloWorld,null);
+    Expect.stringEquals(result,"Hello World");
   });
+
+   test('Message with one numeric', () {
+      intl_oneNumeric(num)
+        //@desc Tell the user about their lucky number.
+        => "Your lucky number is $num";
+     var msg_format = new MessageFormat();
+     var result = msg_format.formatMessage(intl_oneNumeric,42);
+     Expect.stringEquals(result,"Your lucky number is 42");
+  });
+
+  /**
+   * Test for the simple error of evaluating the message function before
+   * passing it in.
+   */
+
+  test('Evaluate the function by mistake', () {
+        intl_oopsie()
+         //@desc Doesn't matter
+         => "You want to pass the formatter the function, not the string";
+        var msg_format = new MessageFormat();
+        expectThrow(()=>msg_format.formatMessage(intl_oopsie(),null));
+  });
+
+  test('Complex message with plural', () {
+       var intl = new Intl();
+       var df = intl.date;
+       intl_howManyPeopleAreHere (NUM) =>
+         //@desc Lists how many people are here
+         "There ${intl.plural(NUM,{'0': 'are', '1': 'is', 'other': 'are'})} "
+      "$NUM other ${intl.plural(NUM, {'1':'person', 'other': 'people'})} here.";
+       var msg_format = new MessageFormat();
+       Expect.stringEquals(
+           msg_format.formatMessage(intl_howManyPeopleAreHere,0),
+           "There are 0 other people here.");
+       Expect.stringEquals(
+          msg_format.formatMessage(intl_howManyPeopleAreHere,1),
+          "There is 1 other person here.");
+       Expect.stringEquals(
+          msg_format.formatMessage(intl_howManyPeopleAreHere,2),
+          "There are 2 other people here.");
+  });
+
+  test('MessageFormat with message', () {
+          intl_mapArgument (dict)
+          // @desc Lists person's name
+          => "Hello, my name is ${dict['firstName']} ${dict['lastName']}";
+      var msg_format = new MessageFormat(intl_mapArgument);
+      var person = {'firstName' : 'Ford', 'lastName': 'Prefect'};
+      Expect.stringEquals(
+         msg_format.format(person),
+         "Hello, my name is Ford Prefect");
+  });
+
 }