TST: disable mypy tests in test suite unless an environment variable is set

rgommers · rgommers · commit 7de0dbb01d8a · 2023-08-15T09:28:50.000+02:00
These tests are super slow, and they're effectively always passing in CI.
Running them on all "full" test suite runs is too expensive. Note that
SciPy has an XSLOW mark, NumPy does not. So use an env var for now.

[skip circle] [skip travis] [skip azp]
diff --git a/.github/workflows/linux_meson.yml b/.github/workflows/linux_meson.yml
@@ -68,5 +68,6 @@ jobs:
         TERM: xterm-256color
         LD_LIBRARY_PATH: "/usr/local/lib/"  # to find libopenblas.so.0
       run: |
+        export NPY_RUN_MYPY_IN_TESTSUITE=1
         pip install pytest pytest-xdist hypothesis typing_extensions
         spin test -j auto
diff --git a/numpy/typing/tests/test_typing.py b/numpy/typing/tests/test_typing.py
@@ -18,6 +18,21 @@
     _C_INTP,
 )
 
+
+# Only trigger a full `mypy` run if this environment variable is set
+# Note that these tests tend to take over a minute even on a macOS M1 CPU,
+# and more than that in CI.
+RUN_MYPY = "NPY_RUN_MYPY_IN_TESTSUITE" in os.environ
+if RUN_MYPY and RUN_MYPY not in ('0', '', 'false'):
+    RUN_MYPY = True
+
+# Skips all functions in this file
+pytestmark = pytest.mark.skipif(
+    not RUN_MYPY,
+    reason="`NPY_RUN_MYPY_IN_TESTSUITE` not set"
+)
+
+
 try:
     from mypy import api
 except ImportError:
