pyfakefs: A fake filesystem for tests

• Introduction
  • Installation
  • Features
  • Limitations
  • Alternatives
  • History
  • Running pyfakefs unit tests
• Usage
  • Test Scenarios
  • Patch file system with unittest and doctest
• Using convenience methods
  • File creation helpers
  • Access to files in the real file system
  • Handling mount points
  • Setting the file system size
  • Suspending patching
  • Simulating other file systems
  • Set file as inaccessible under Windows
• Customizing patching
  • Using custom arguments
  • List of custom arguments
• Troubleshooting
  • Modules not working with pyfakefs
  • Pyfakefs behaves differently than the real filesystem
  • The test code tries to access files in the real filesystem
  • OS temporary directories
  • User rights
  • Interaction with other fixtures working on the filesystem
  • Pathlib.Path objects created outside of tests
  • Nested file system fixtures and Patcher invocations
  • Tests failing after a test using pyfakefs
  • Contiguous tests use large amounts of memory
  • Directly accessing device files in tests
• Public Modules and Classes
  • Fake filesystem module
  • Fake filesystem classes
  • Unittest module classes
  • Faked module classes