Support nested matchers in deep equality matching.

pkg/unittest/test/pretty_print_test.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.
 
 import 'package:unittest/src/pretty_print.dart';
 import 'package:unittest/unittest.dart';
 
 void main() {
   test('with primitive objects', () {
     expect(prettyPrint(12), equals('<12>'));
@@ skipping 30 matching lines @@
     test('containing a multiline string', () {
       expect(prettyPrint(['foo', 'bar\nbaz\nbip', 'qux']), equals("[\n"
           "  'foo',\n"
           "  'bar\\n'\n"
           "    'baz\\n'\n"
           "    'bip',\n"
           "  'qux'\n"
           "]"));
     });
 
+    test('containing a matcher', () {
+      expect(prettyPrint(['foo', endsWith('qux')]),
+          equals("['foo', <a string ending with 'qux'>]"));
+    });
+
     test("that's under maxLineLength", () {
       expect(prettyPrint([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], maxLineLength: 30),
           equals("[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]"));
     });
 
     test("that's over maxLineLength", () {
       expect(prettyPrint([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], maxLineLength: 29),
           equals("[\n"
               "  0,\n"
               "  1,\n"
@@ skipping 70 matching lines @@
     });
 
     test('containing a multiline string key/value pair', () {
       expect(prettyPrint({'foo\nbar': 'baz\nqux'}), equals("{\n"
           "  'foo\\n'\n"
           "    'bar': 'baz\\n'\n"
           "    'qux'\n"
           "}"));
     });
 
+    test('containing a matcher key', () {
+      expect(prettyPrint({endsWith('bar'): 'qux'}),
+          equals("{<a string ending with 'bar'>: 'qux'}"));
+    });
+
+    test('containing a matcher value', () {
+      expect(prettyPrint({'foo': endsWith('qux')}),
+          equals("{'foo': <a string ending with 'qux'>}"));
+    });
+
     test("that's under maxLineLength", () {
       expect(prettyPrint({'0': 1, '2': 3, '4': 5, '6': 7}, maxLineLength: 32),
           equals("{'0': 1, '2': 3, '4': 5, '6': 7}"));
     });
 
     test("that's over maxLineLength", () {
       expect(prettyPrint({'0': 1, '2': 3, '4': 5, '6': 7}, maxLineLength: 31),
           equals("{\n"
               "  '0': 1,\n"
               "  '2': 3,\n"
@@ skipping 21 matching lines @@
       expect(prettyPrint({'0': 1, '2': 3, '4': 5, '6': 7}, maxItems: 4),
           equals("{'0': 1, '2': 3, '4': 5, '6': 7}"));
     });
 
     test("that's over maxItems", () {
       expect(prettyPrint({'0': 1, '2': 3, '4': 5, '6': 7}, maxItems: 3),
           equals("{'0': 1, '2': 3, ...}"));
     });
   });
 }