Skip lxml and mypyc external tests against built wheels (#11872)

Co-authored-by: hauntsaninja <>

misc/build_wheel.py

@@ -73,19 +73,28 @@ def create_environ(python_version: str) -> Dict[str, str]:
         'MYPY_USE_MYPYC=1 MYPYC_OPT_LEVEL=2 PIP_NO_BUILD_ISOLATION=no'
     )
 
+    # lxml doesn't have a wheel for Python 3.10 on the manylinux image we use.
+    # lxml has historically been slow to support new Pythons as well.
     env['CIBW_BEFORE_TEST'] = (
-        'pip install -r {project}/mypy/test-requirements.txt'
+        'pip install -r <(grep -v lxml {project}/mypy/test-requirements.txt)'
     )
 
     # pytest looks for configuration files in the parent directories of where the tests live.
     # since we are trying to run the tests from their installed location, we copy those into
     # the venv. Ew ew ew.
+    # We don't run tests that need lxml since we don't install lxml
+    # We don't run external mypyc tests since there's some issue with compilation on the
+    # manylinux image we use.
     env['CIBW_TEST_COMMAND'] = """
       (
       DIR=$(python -c 'import mypy, os; dn = os.path.dirname; print(dn(dn(mypy.__path__[0])))')
-      && TEST_DIRS=$(python -c 'import mypy.test; import mypyc.test; print(mypy.test.__path__[0], mypyc.test.__path__[0])')
       && cp '{project}/mypy/pytest.ini' '{project}/mypy/conftest.py' $DIR
-      && MYPY_TEST_PREFIX='{project}/mypy' pytest $TEST_DIRS
+
+      && MYPY_TEST_DIR=$(python -c 'import mypy.test; print(mypy.test.__path__[0])')
+      && MYPY_TEST_PREFIX='{project}/mypy' pytest $MYPY_TEST_DIR -k 'not (reports.test or testreports)'
+
+      && MYPYC_TEST_DIR=$(python -c 'import mypyc.test; print(mypyc.test.__path__[0])')
+      && pytest $MYPYC_TEST_DIR -k 'not test_external'
       )
     """.replace('\n', ' ')
 

mypy/test/testreports.py

@@ -4,15 +4,15 @@
 from mypy.test.helpers import Suite, assert_equal
 from mypy.report import CoberturaPackage, get_line_rate
 
-import lxml.etree as etree  # type: ignore
-
 
 class CoberturaReportSuite(Suite):
     def test_get_line_rate(self) -> None:
         assert_equal('1.0', get_line_rate(0, 0))
         assert_equal('0.3333', get_line_rate(1, 3))
 
     def test_as_xml(self) -> None:
+        import lxml.etree as etree  # type: ignore
+
         cobertura_package = CoberturaPackage('foobar')
         cobertura_package.covered_lines = 21
         cobertura_package.total_lines = 42