Make mock behaviors be ordered.

pkg/unittest/test/mock_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 mock_test;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/mock.dart';
 
 class MockList extends Mock implements List {
 }
@@ skipping 643 matching lines @@
     var alice = new Object();
     var bob = new Object();
     var m = new Mock();
     m.when(callsTo("foo", alice)).alwaysReturn(true);
     m.when(callsTo("foo", bob)).alwaysReturn(false);
     expect(m.foo(alice), true);
     expect(m.foo(bob), false);
     expect(m.foo(alice), true);
     expect(m.foo(bob), false);
   });
+
+  test("Behavior ordering", () {
+    // This is distinct from value ordering, i.e.
+    //
+    // m.when(...).thenReturn(1).thenReturn(2)
+    // 
+    // Here we want to test using distinct matchers being
+    // applied in order, so we have a single call that
+    // matches 3 different behaviors, and test that 
+    // the behaviors are applied in the order they are
+    // defined.
+    var m = new Mock();
+    m.when(callsTo("foo")).thenReturn("A");
+    m.when(callsTo("foo", "bar")).thenReturn("B");
+    m.when(callsTo("foo", "bar", "mock")).alwaysReturn("C");
+    expect(m.foo("bar", "mock"), "A");
+    expect(m.foo("bar", "mock"), "B");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    m.resetBehavior();
+
+    m.when(callsTo("foo")).thenReturn("A");
+    m.when(callsTo("foo", "bar", "mock")).alwaysReturn("C");
+    m.when(callsTo("foo", "bar")).thenReturn("B");
+    expect(m.foo("bar", "mock"), "A");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    m.resetBehavior();
+
+    m.when(callsTo("foo", "bar")).thenReturn("B");
+    m.when(callsTo("foo")).thenReturn("A");
+    m.when(callsTo("foo", "bar", "mock")).alwaysReturn("C");
+    expect(m.foo("bar", "mock"), "B");
+    expect(m.foo("bar", "mock"), "A");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    m.resetBehavior();
+
+    m.when(callsTo("foo", "bar")).thenReturn("B");
+    m.when(callsTo("foo", "bar", "mock")).alwaysReturn("C");
+    m.when(callsTo("foo")).thenReturn("A");
+    expect(m.foo("bar", "mock"), "B");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    m.resetBehavior();
+
+    m.when(callsTo("foo", "bar", "mock")).alwaysReturn("C");
+    m.when(callsTo("foo")).thenReturn("A");
+    m.when(callsTo("foo", "bar")).thenReturn("B");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    expect(m.foo("bar", "mock"), "C");
+    m.resetBehavior();
+  });
 }
+