Change signature of noSuchMethod to take an InvocationMirror.

pkg/unittest/mock.dart

Index: pkg/unittest/mock.dart
diff --git a/pkg/unittest/mock.dart b/pkg/unittest/mock.dart
index ded68f35dfff0cef4fa423517ae9ddb1c42a2295..91f5f7a65fd783de9e72fb1624454adc3b458d94 100644
--- a/pkg/unittest/mock.dart
+++ b/pkg/unittest/mock.dart
@@ -1274,10 +1274,13 @@ class Mock {
    * return value. If we find no [Behavior] to apply an exception is
    * thrown.
    */
-  noSuchMethod(String method, List args) {
-    if (method.startsWith('get:')) {
-      method = 'get ${method.substring(4)}';
+  noSuchMethod(InvocationMirror invocation) {
+    String method = invocation.getterName;
+    if (invocation.isGetter) {
+      method = 'get $method';
     }
+    List args = invocation.positionalArguments;
+    // TODO: Handle named arguments too.
     bool matchedMethodName = false;
     MatchState matchState = new MatchState();
     for (String k in _behaviors.getKeys()) {