# Gazelle Python extension test cases Each directory is a test case that contains `BUILD.in` and `BUILD.out` files for assertion. `BUILD.in` is used as how the build file looks before running Gazelle, and `BUILD.out` how the build file should look like after running Gazelle. Each test case is a Bazel workspace and Gazelle will run with its working directory set to the root of this workspace, though, the test runner will find `test.yaml` files and use them to determine the directory Gazelle should use for each inner Python project. The `test.yaml` file is a manifest for the test - check for the existing ones for examples.