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-rw-r--r--tests/utils.py15
1 files changed, 15 insertions, 0 deletions
diff --git a/tests/utils.py b/tests/utils.py
index b32d5ef356..98d4f9ed58 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -248,8 +248,11 @@ class DeferredMockCallable(object):
 
     def __init__(self):
         self.expectations = []
+        self.calls = []
 
     def __call__(self, *args, **kwargs):
+        self.calls.append((args, kwargs))
+
         if not self.expectations:
             raise ValueError("%r has no pending calls to handle call(%s)" % (
                 self, _format_call(args, kwargs))
@@ -272,3 +275,15 @@ class DeferredMockCallable(object):
         while self.expectations:
             (_, _, d) = self.expectations.pop(0)
             yield d
+        self.calls = []
+
+    def assert_had_no_calls(self):
+        if self.calls:
+            calls = self.calls
+            self.calls = []
+
+            raise AssertionError("Expected not to received any calls, got:\n" +
+                "\n".join([
+                    "call(%s)" % _format_call(c[0], c[1]) for c in calls
+                ])
+            )