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POHow do I mock a superclass's __init__ create an attribute containing a mock object for a unit test?
 

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  1. POHow do I mock a superclass's __init__ create an attribute containing a mock object for a unit test?
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    <p>I am attempting to write a unit test for a class's <code>__init__</code>:</p> <pre><code>def __init__(self, buildNum, configFile = "configfile.txt"): super(DevBuild, self).__init__(buildNum, configFile) if configFile == "configfile.txt": self.config.MakeDevBuild() </code></pre> <p>The config attribute is set by the super's <code>__init__</code>. I'm using <a href="http://mock.readthedocs.org/en/latest/index.html">mock</a>, and I want the config attribute to be a mock object. However, I haven't been able to figure out how to actually make that happen. Here's the best I could come up with for the test:</p> <pre><code>def test_init(self): with patch('DevBuild.super', create=True) as mock_super: mock_MakeDevBuild = MagicMock() mock_super.return_value.config.MakeDevBuild = mock_MakeDevBuild # Test with manual configuration self.testBuild = DevBuild("42", "devconfigfile.txt") self.assertFalse(mock_MakeDevBuild.called) # Test with automated configuration self.testBuild = DevBuild("42") mock_MakeDevBuild.assert_called_once_with() </code></pre> <p>However, this doesn't work--I get an error:</p> <pre><code>Error Traceback (most recent call last): File "/Users/khagler/Projects/BuildClass/BuildClass/test_devBuild.py", line 17, in test_init self.testBuild = DevBuild("42") File "/Users/khagler/Projects/BuildClass/BuildClass/DevBuild.py", line 39, in __init__ self.config.MakeDevBuild() AttributeError: 'DevBuild' object has no attribute 'config' </code></pre> <p>Clearly I'm not setting the config attribute correctly, but I have no idea <em>where</em> exactly I should be setting it. Or for that matter, if what I want to do is even possible. Can anyone tell me what I need to do to make this work?</p>
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    1. USkhagler
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    1. COAn observation: the return value of `super` is not an object that has a `config` attribute, but rather an object that has a method `__init__` that will add a `config` attribute to its argument.
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      1. POHow do I mock a superclass's __init__ create an attribute containing a mock object for a unit test?
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    2. COIs that the entire `__init__`? If it is, it will only add self.config.MakeDevBuild if no configuration file name is passed, which you do in your test.
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      1. USjlujan
 

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