Add loose parsing option for dates, accepting mixed case and missing delimiters

test/date_time_loose_parsing_test.dart

Index: test/date_time_loose_parsing_test.dart
diff --git a/test/date_time_loose_parsing_test.dart b/test/date_time_loose_parsing_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..11589820c002ef173b5c4c63df9f559d49e9173c
--- /dev/null
+++ b/test/date_time_loose_parsing_test.dart
@@ -0,0 +1,55 @@
+// 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.
+
+/// Tests for the loose option when parsing dates and times, which accept
+/// mixed-case input and are able to skip missing delimiters. This is only
+/// tested in basic US locale, it's hard to define for others.
+library date_time_loose_test;
+
+import 'package:intl/intl.dart';
+import 'package:unittest/unittest.dart';
+
+main() {
+  var format;
+
+  var date = new DateTime(2014, 9, 3);
+
+  check(String s) {
+    expect(() => format.parse(s), throwsFormatException);
+    expect(format.parseLoose(s), date);
+  }
+
+  test("Loose parsing yMMMd", () {
+    // Note: We can't handle e.g. Sept, we don't have those abbreviations
+    // in our data.
+    // Also doesn't handle "sep3,2014", or "sep 3.2014"
+    format = new DateFormat.yMMMd("en_US");
+    check("Sep 3 2014");
+    check("sep 3 2014");
+    check("sep 3  2014");
+    check("sep  3 2014");
+    check("sep  3       2014");
+    check("sep3 2014");
+    check("september 3, 2014");
+    check("sEPTembER 3, 2014");
+    check("seP 3, 2014");
+  });
+
+  test("Loose parsing yMMMd that parses strict", () {
+    expect(format.parseLoose("Sep 3, 2014"), date);
+  });
+
+  test("Loose parsing yMd", () {
+    format = new DateFormat.yMd("en_US");
+    check("09 3 2014");
+    check("09 00003    2014");
+    check("09/    03/2014");
+    expect(() => format.parseLoose("09 / 03 / 2014"), throwsA(new isInstanceOf<FormatException>()));
+  });
+
+  test("Loose parsing yMd that parses strict", () {
+    expect(format.parseLoose("09/03/2014"), date);
+    expect(format.parseLoose("09/3/2014"), date);
+  });
+}