mypy_selftest: rename to mypy_self_check (#4712)

This better disambiguates it from mypy_test_suite and is more inline
with how mypy refers to it internally.

Co-authored-by: hauntsaninja <>

.github/workflows/tests.yml

@@ -67,13 +67,13 @@ jobs:
       - run: pip install -U git+git://github.com/python/mypy
       - run: ./tests/mypy_test.py --platform=${{ matrix.platform }}
 
-  mypy-self-test:
-    name: Test mypy source with itself
+  mypy-self-check:
+    name: Check mypy source with itself
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
-      - run: ./tests/mypy_selftest.py
+      - run: ./tests/mypy_self_check.py
 
   mypy-test-suite:
     name: Run the mypy test suite