Changed the syntax some. All the handling of variable argument lists is

tests/lib/unittest/unittest_test.dart

Index: tests/lib/unittest/unittest_test.dart
===================================================================
--- tests/lib/unittest/unittest_test.dart	(revision 9180)
+++ tests/lib/unittest/unittest_test.dart	(working copy)
@@ -72,6 +72,21 @@
   }
 }
 
+class MockList extends Mock implements List {
+}
+
+class Foo {
+  bar(a, b, c) => a + b + c;
+}
+
+class FooSpy extends Mock implements Foo {
+  FooSpy real;
+  FooSpy() {
+    real = new Foo();
+    this.whenThereAre(callsTo('bar')).alwaysCall(real.bar);
+  }
+}
+
 runTest() {
   port.receive((testName, sendport) {
     configure(_testconfig = new TestConfiguration(sendport));
@@ -124,6 +139,53 @@
              () => (_testconfig.count == 10));
              _defer(_callback);
       });
+    } else if (testName == 'mock test 1 (Mock)') {
+      test(testName, () {
+        var m = new Mock();
+
+        m.whenThereAre(callsTo('Sum', 1, 2)).thenReturn('A').thenReturn('B');

[Siggi Cherem (dart-lang), 2012/06/28 00:44:40]

I'm playing around with other ideas to see if there is any that you like:
- m.whenThereIs(aCall('sum', 1, 2)).thenReturn('A')
- m.mock(callTo('sum', 1, 2)).returns('A')
- m.mock(aCallTo('sum', 1, 2)).returns('A')
- aCall(m, 'Sum', 1, 2).returns('A')
- mockCall(m, 'Sum', 1, 2).toReturn('A')

Also, we could overload the noSuchMethod so we can use it to record
expectations? (e.g. when we are done setting up, we can say m.readyToUse(); or
something):
- m.sum(1,2).returns('a')

+        m.whenThereAre(callsTo('Sum', 1, 1)).thenReturn('C');
+        m.whenThereAre(callsTo('Sum', anything, anything)).thenReturn('D');
+        m.whenThereAre(callsTo('Sub', anything, anything)).thenReturn('E');

[Siggi Cherem (dart-lang), 2012/06/28 00:44:40]

could we change the example to use lowercase method names instead :)?

[gram, 2012/06/28 17:32:54]

Done, and I changed the names to foo/bar which is more nebulous, as they
certainly don't do addition, etc.

+
+        var s = '${m.Sum(1,2)}${m.Sum(1,1)}${m.Sum(9,10)}'
+            '${m.Sub(1,1)}${m.Sum(1,2)}';
+        m.forThe(callsTo('Sum', anything, anything)).verify(calledExactly(4));

[Siggi Cherem (dart-lang), 2012/06/28 00:44:40]

Ideas instead of 'm.forThe(_).verify(_)'
- m.verify(_).that(_)
- m.veryfy(_).itWas(_)

+        m.forThe(callsTo('Sum', 1, anything)).verify(calledExactly(3));
+        m.forThe(callsTo('Sum', 9, anything)).verify(calledOnce);
+        m.forThe(callsTo('Sum', anything, 2)).verify(calledExactly(2));
+        expect(s, 'ACDEB');
+      });
+    } else if (testName == 'mock test 2 (MockList)') {
+      test(testName, () {
+        MockList l = new MockList();
+        l.whenThereAre(callsTo('length')).thenReturn(1);
+        l.whenThereAre(callsTo('add', anything)).alwaysReturn(0);
+        l.add('foo');
+        expect(l.length(), 1);
+
+        List m = new MockList();
+        m.whenThereAre(callsTo('add', anything)).alwaysReturn(0);
+
+        m.add('foo');
+        m.add('bar');
+
+        m.forThe(callsTo('add')).verify(calledExactly(2));
+        m.forThe(callsTo('add', 'foo')).verify(calledOnce);
+      });
+    } else if (testName == 'mock test 3 (Spy)') {
+      test(testName, () {
+        var p = new FooSpy();
+        p.bar(1, 2, 3);
+        p.forThe(callsTo('bar')).verify(calledOnce);
+        p.bar(2, 2, 2);
+        p.forThe(callsTo('bar')).verify(calledExactly(2));
+        p.forThe(callsTo('bar')).verify(sometimeReturned(6));
+        p.forThe(callsTo('bar')).verify(alwaysReturned(6));
+        p.forThe(callsTo('bar')).verify(neverReturned(5));
+        p.bar(2, 2, 1);
+        p.forThe(callsTo('bar')).verify(sometimeReturned(5));
+      });
     }
   });
 }
@@ -153,7 +215,10 @@
     'setup and teardown test',
     'correct callback test',
     'excess callback test',
-    'completion test'
+    'completion test',
+    'mock test 1 (Mock)',
+    'mock test 2 (MockList)',
+    'mock test 3 (Spy)'
   ];
 
   expected = [
@@ -168,7 +233,10 @@
     buildStatusString(1, 0, 0, tests[7], 1),
     buildStatusString(0, 0, 1, tests[8], 1,
         message: 'Callback called more times than expected (2 > 1)'),
-    buildStatusString(1, 0, 0, tests[9], 10)
+    buildStatusString(1, 0, 0, tests[9], 10),
+    buildStatusString(1, 0, 0, tests[10]),
+    buildStatusString(1, 0, 0, tests[11]),
+    buildStatusString(1, 0, 0, tests[12])
   ];
 
   actual = [];