python data_error ai_generated true

AssertionError: Expected mock to be called 2 times. Called 1 times.

ID: python/unittest-mock-call-count-error

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80%Fix Rate
86%Confidence
0Evidence
2024-03-25First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —

Root Cause

The code under test calls the mocked function fewer times than expected, often due to conditional logic or early returns.

generic

中文

被测试的代码调用模拟函数的次数少于预期，通常是由于条件逻辑或提前返回。

Workarounds

  1. 90% success Debug the code to understand why the function is not called enough times. 
    Add print statements or use a debugger to trace the execution path.
  2. 85% success Use mock.call_args_list to inspect actual calls and compare with expected. 
    assert mock.call_args_list == [call(arg1), call(arg2)]

Dead Ends

Common approaches that don't work:

  1. Increasing the expected call count to match actual calls 80% fail

    This masks the bug in the code that is not calling the function enough times.

  2. Adding mock.reset_mock() before assertion 70% fail

    Resetting the mock clears call history, making the assertion pass incorrectly.