Merge pull request #166 from scipy/register_assert_rewrite

BUG: pytest register_assert_rewrites of internal modules

scipy_doctest/__init__.py

@@ -5,6 +5,18 @@
 
 __version__ = "1.3dev0"
 
+try:
+    # register internal modules with pytest; obscure errors galore otherwise
+    import pytest
+    pytest.register_assert_rewrite(
+        "scipy_doctest.conftest", "scipy_doctest.impl", "scipy_doctest.util",
+        "scipy_doctest.frontend", "scipy_doctest.plugin"
+    )
+except ModuleNotFoundError:
+    # pytest is optional, so nothing to do
+    pass
+
+
 from .impl import DTChecker, DTFinder, DTParser, DTRunner, DebugDTRunner, DTConfig  # noqa
 from .frontend import testmod, testfile, find_doctests, run_docstring_examples      # noqa