Workaround for CPython's tests. See comment

1 files changed, 83 insertions, 0 deletions

diff --git a/extra_tests/test_pypy_modules.py b/extra_tests/test_pypy_modules.py
new file mode 100644
index 0000000000..de105158fc
--- /dev/null
+++ b/extra_tests/test_pypy_modules.py
@@ -0,0 +1,83 @@
+import sys
+import importlib
+import pytest
+
+# This is a workaround for a dubious feature of CPython's test suite: it skips
+# tests silently if importing a module fails.  This makes some partial sense
+# for CPython itself when testing C extension modules directly, because very
+# often (but not always) a C extension module is either completely absent or
+# imports successfully.  But for PyPy it's a mess because it can hide mistakes
+# very easily, and it did.  So the list we build here should contain the names
+# of every module that CPython's tests import with test.support.import_module()
+# but that should really be present on the running platform.
+
+
+expected_modules = []
+
+# ----- everywhere -----
+expected_modules += [
+    'MimeWriter',
+    'bz2',
+    'commands',
+    'compiler',
+    '_ctypes',
+    'dircache',
+    'fpformat',
+    'gzip',
+    'htmllib',
+    'mhlib',
+    'mimetools',
+    'mmap',
+    'multifile',
+    '_multiprocessing',
+    'multiprocessing.synchronize',
+    'mutex',
+    'new',
+    'sre',
+    'rfc822',
+    'sets',
+    '_sqlite3',
+    'ssl',
+    'thread',
+    'threading',
+    'xmllib',
+    'zlib',
+]
+
+# ----- non-Windows -----
+if sys.platform != 'win32':
+    expected_modules += [
+        'curses',
+        'curses.ascii',
+        'curses.textpad',
+        'dbm',
+        'fcntl',
+        'gdbm',
+        'grp',
+        'posix',
+        'pwd',
+        'readline',
+        'resource',
+        'termios',
+    ]
+else:
+    # ----- Windows only -----
+    expected_modules += [
+        '_winreg',
+    ]
+
+# ----- Linux only -----
+if sys.platform.startswith('linux'):
+    expected_modules += [
+        'crypt',
+    ]
+
+
+# ------------------------------------------------
+
+@pytest.fixture(scope="module", params=expected_modules)
+def modname(request):
+    return request.param
+
+def test_expected_modules(modname):
+    importlib.import_module(modname)