CallMatchers can now be null, or take null for a method name. This might be

tests/lib/unittest/unittest_test.dart

Index: tests/lib/unittest/unittest_test.dart
===================================================================
--- tests/lib/unittest/unittest_test.dart	(revision 9489)
+++ tests/lib/unittest/unittest_test.dart	(working copy)
@@ -139,7 +139,7 @@
              () => (_testconfig.count == 10));
              _defer(_callback);
       });
-    } else if (testName == 'mock test 1 (Mock)') {
+    } else if (testName.startsWith('mock test 1 ')) {
       test(testName, () {
         var m = new Mock();
         print(m.length);
@@ -164,13 +164,13 @@
               verify(happenedExactly(2));
         expect(s, 'ACDEB');
       });
-    } else if (testName == 'mock test 2 (MockList)') {
+    } else if (testName.startsWith('mock test 2 ')) {
       test(testName, () {
         var l = new MockList();
-        l.when(callsTo('length')).thenReturn(1);
+        l.when(callsTo('get length')).thenReturn(1);
         l.when(callsTo('add', anything)).alwaysReturn(0);
         l.add('foo');
-        expect(l.length(), 1);
+        expect(l.length, 1);
 
         var m = new MockList();
         m.when(callsTo('add', anything)).alwaysReturn(0);
@@ -181,7 +181,7 @@
         m.getLogs(callsTo('add')).verify(happenedExactly(2));
         m.getLogs(callsTo('add', 'foo')).verify(happenedOnce);
       });
-    } else if (testName == 'mock test 3 (Spy)') {
+    } else if (testName.startsWith('mock test 3 ')) {
       test(testName, () {
         var p = new FooSpy();
         p.sum(1, 2, 3);
@@ -194,7 +194,7 @@
         p.sum(2, 2, 1);
         p.getLogs(callsTo('sum')).verify(sometimeReturned(5));
       });
-    } else if (testName == 'mock test 4 (Excess calls)') {
+    } else if (testName.startsWith('mock test 4 ')) {
       test(testName, () {
         var m = new Mock();
         m.when(callsTo('foo')).alwaysReturn(null);
@@ -202,27 +202,27 @@
         m.foo();
         m.getLogs(callsTo('foo')).verify(happenedOnce);
       });
-    } else if (testName == 'mock test 5 (No action)') {
+    } else if (testName.startsWith('mock test 5 ')) {
       test(testName, () {
         var m = new Mock();
         m.when(callsTo('foo')).thenReturn(null);
         m.foo();
         m.foo();
       });
-    } else if (testName == 'mock test 6 (No matching return)') {
+    } else if (testName.startsWith('mock test 6 ')) {
       test(testName, () {
         var p = new FooSpy();
         p.sum(1, 2, 3);
         p.getLogs(callsTo('sum')).verify(sometimeReturned(0));
       });
-    } else if (testName == 'mock test 7 (No behavior)') {
+    } else if (testName.startsWith('mock test 7 ')) {
       test(testName, () {
         var m = new Mock.custom(throwIfNoBehavior:true);
         m.when(callsTo('foo')).thenReturn(null);
         m.foo();
         m.bar();
       });
-    } else if (testName == 'mock test 8 (Shared log)') {
+    } else if (testName.startsWith('mock test 8 ')) {
       test(testName, () {
         var log = new LogEntryList();
         var m1 = new Mock.custom(name:'m1', log:log);
@@ -238,6 +238,22 @@
         m2.getLogs(callsTo('foo')).verify(happenedOnce);
         m2.getLogs(callsTo('bar')).verify(happenedOnce);
       });
+    } else if (testName.startsWith('mock test 9 ')) {
+      test(testName, () {
+        var m = new Mock();
+        m.when(callsTo(null, 1)).alwaysReturn(2);

[Siggi Cherem (dart-lang), 2012/07/10 23:38:28]

another option is to pass a regex, rather than a null value. For instance:
callsTo("*", 1).alwaysReturn(2)
callsTo("foo*", 1).alwaysReturn(2)

What do you think?

+        m.when(callsTo(null, 2)).alwaysReturn(4);
+        expect(m.foo(1), 2);
+        expect(m.foo(2), 4);
+        expect(m.bar(1), 2);
+        expect(m.bar(2), 4);
+        m.getLogs(callsTo()).verify(happenedExactly(4));
+        m.getLogs(callsTo(null, 1)).verify(happenedExactly(2));
+        m.getLogs(callsTo(null, 2)).verify(happenedExactly(2));
+        m.getLogs(null, returning(1)).verify(neverHappened);
+        m.getLogs(null, returning(2)).verify(happenedExactly(2));
+        m.getLogs(null, returning(4)).verify(happenedExactly(2));
+      });
     }
   });
 }
@@ -275,7 +291,8 @@
     'mock test 5 (No action)',
     'mock test 6 (No matching return)',
     'mock test 7 (No behavior)',
-    'mock test 8 (Shared log)'
+    'mock test 8 (Shared log)',
+    'mock test 9 (Null CallMatcher)'
   ];
 
   expected = [
@@ -303,7 +320,8 @@
         message: 'Expected sum() to sometimes return <0> but: never did'),
     buildStatusString(0, 1, 0, tests[16],
         message: 'Caught Exception: No behavior specified for method bar'),
-    buildStatusString(1, 0, 0, tests[17])
+    buildStatusString(1, 0, 0, tests[17]),
+    buildStatusString(1, 0, 0, tests[18])
   ];
 
   actual = [];