pyfakefs | pyfakefs implements a fake file system | Mock library
kandi X-RAY | pyfakefs Summary
kandi X-RAY | pyfakefs Summary
pyfakefs implements a fake file system that mocks the Python file system modules. Using pyfakefs, your tests operate on a fake file system in memory without touching the real disk. The software under test requires no modification to work with pyfakefs. pyfakefs works with Linux, Windows and MacOS.
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Top functions reviewed by kandi - BETA
- Create a file - like object .
- Creates a fake file .
- Sets an attribute on an object .
- Join the real path to the real path .
- Wrap a write method .
- Send a file to fd_out .
- Initialize the fake stat .
- Resolve a symlink .
- Removes the specified directory .
- Get home directory for given username .
pyfakefs Key Features
pyfakefs Examples and Code Snippets
Lines of Code : 118License : Non-SPDX (Apache License 2.0)
Copydef _convert_bytes_to_cc_source(data,
array_name,
max_line_width=80,
include_guard=None,
include_path=None,
def xxd_output_to_bytes(input_cc_file):
"""Converts xxd output C++ source file to bytes (immutable).
Args:
input_cc_file: Full path name to th C++ source file dumped by xxd
Raises:
RuntimeError: If input_cc_file path is invalid.
I def get_dump_sizes_bytes(self,
node_name,
output_slot,
debug_op,
device_name=None):
"""Get the sizes of the dump files for a debug-dumped Community Discussions
Trending Discussions on pyfakefs
QUESTION
I wrote a test for a function that renames files from e.g. /videos/vid_youtube.mp4 to /videos/youtube/vid.mp4. The test patches the fs with Pyfakefs.
When the code actually renames the file, I get this error.
...ANSWER
Answered 2022-Apr-02 at 14:13The problem here is most likely the static initialization of Dirs.VIDEOS. This is initialized at load time as a pathlib.Path, and won't be patched later at the time you setup pyfakefs (the same problem would happen if you where to use unittest.patch for patching).
There are two ways to fix this:
- adapt the code to not initialize the path statically
This could be done by statically defining thestrpath, and converting it to aPathat run time, or by using a method to get the path instead of an attribute (e.g.Dirs.VIDEO()instead of Dirs.VIDEO`). - adapt the test to reload the tested code
If reloading the tested code afterpyfakefshas been initialized, it will be correctly patched.pyfakefsprovides an argument insetUpPyfakefsthat does that:
QUESTION
I have some Python code that loads in a local JSON file:
...ANSWER
Answered 2022-Feb-27 at 11:37With pyfakefs, you can map real files into the fake file system. In your case, you can use add_real_file:
QUESTION
I have subclassed PosixPath this way:
ANSWER
Answered 2021-Oct-07 at 18:22The problem here is that Node is derived from PosixPath at load time, while pathlib is not patched yet, and it will not be patched because patching is done by module name. If you want to have it derived from the patched PosixPath, the class definition has to be reloaded after patching started. As you are using pytest, the best way is probably to write your own fixture that does that:
QUESTION
I want to patch a method by running the original method with additional code before and after. In particular, I'm running tests within a pyfakefs in-memory file system, but I want to sometime use the real file system because some packages will not work on the fake file system (pybedtools in my case).
There is probably simple way to do this, but I can't figure it out after many, many tries. Is this possible?
Just for an example, below I'm trying to patch to_csv in pandas.
ANSWER
Answered 2021-Jun-20 at 08:14One (not very elegant) possibility would be to use the third approach and avoid the recursion by using the old saved to_csv method:
QUESTION
One of my Travis build tests have started to fail with the following error:
...ANSWER
Answered 2021-Mar-04 at 22:45Historically, pip didn't have a proper dependency resolver. So, if you asked it to install a package without any version flag, you’d be getting the newest version of the package, even if it conflicts with other packages that you had already installed.
However, with pip 20.3, this changes, and now pip has a stricter dependency resolver. Pip will now complain if any of your sub-dependencies are incompatible.
As a quick fix, you can pin your idna version in your requirements.txt to 2.05. As a longer-term solution, you can adopt a tool like pip-tools where you will be able to pin your top-level dependencies in a requirements.in file and run a pip-compile command to generate the requirements.txt file. This way there will be an explicit delineation between the top-level dependencies and the sub-dependencies. Also, the tool will resolve the sub-dependency conflicts for you.
QUESTION
I have been using pytest-mock library for mocking with pytest. When I'm trying to run the test using tox command, I am getting the following error:
ANSWER
Answered 2020-Nov-22 at 22:55tox currently (though this is planned to be improved in the (at the time of writing) current rewrite) does not recreate environments if files it does not manage change (such as requirements.txt / setup.py)
For a related question, you can see my question and workarounds
the core issue here is if you're not managing tox environment dependencies directly inline in tox.ini it will not notice changes (such as adding / removing dependencies from requirements.txt) and so you will need to run tox with the --recreate flag to reflect those changes
disclaimer: I'm one of the current tox maintainers
QUESTION
I'm refactoring a library to use importlib.resources for python 3.7+. I'm using the importlib_resources backport for python 3.6 compatibility. The code works for pythons 3.6-3.8. However, the pytest tests, using pyfakefs, fail for 3.6. Under testing conditions, the path returned from use of importlib_resources is mangled (but under "real-world" conditions they return correctly).
A minimal example: I have the following library structure:
...ANSWER
Answered 2020-Feb-05 at 19:28The fake filesystem in pyfakefs is empty at test start (except for the temp file path needed by the tempfile module), so if you want to access any files in the real filesystem in your test, you have to map them into the fake filesystem:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install pyfakefs
You can use pyfakefs like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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