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+## Testing vim-gitgutter
+
+### Run the tests
+
+```sh
+$ cd test
+$ ./test
+```
+
+### Add a new test
+
+- Add a test file named like `testFoo.vim`.  It should have this structure:
+
+```viml
+source helper.vim
+call Setup()
+
+" test code here
+```
+
+- Run the tests.
+- Inspect output (in `foo.actual`) from the new test.  If good, copy it to `foo.expected`.
+- Run the tests to ensure new test's output is verified.
+- Commit changes.
+
+### Limitations
+
+- Currently tests are done by writing out a file and comparing it to a known good one.
+- There's no support for assertions within the testcase code.
+