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results.
Invoke a real filesystem method with a path to a real file and invoke
a fake filesystem method with a path to a fake file and compare the
results. We expect some calls to throw Exceptions, so we catch those
and compare them.
Args:
method_name: Name of method being tested, for use in
error messages.
path: potential path to a file in the real and fake file systems,
passing an empty tuple indicates that no arguments to pass
to method.
real: built-in system library or method from the built-in system
library which takes a path as an arg and returns some value.
fake: fake_filesystem object or method from a fake_filesystem class
which takes a path as an arg and returns some value.
method_returns_path: True if the method returns a path, and thus we
must compensate for expected difference between real and fake.
Returns:
A description of the difference in behavior, or None.
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HHHHHH ##r c f t | }| ||t | j | S )a Invoke an os method in both real and fake contexts and compare.
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module.
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Args:
method_name: Name of method being tested.
path: potential path to a file in the real and fake file systems.
method_returns_path: True if the method returns a path, and thus we
must compensate for expected difference between real and fake.
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r Tc i }d|vrd|d< t ||fi |5 } | j ||fi |5 }| ||||| cddd cddd S # 1 swxY w Y ddd dS # 1 swxY w Y dS )a Invoke an open method in both real and fake contexts and compare.
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method_name: Name of method being tested.
path: potential path to a file in the real and fake file systems.
mode: how to open the file.
data: any data to pass to the method.
method_returns_data: True if a method returns some sort of data.
For a given method name (from builtin open) and a path, compare the
behavior of the system provided module against the fake_filesystem
module.
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method_name: Name of method being tested.
path: potential path to a file in the real and fake file systems.
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