Skip __main__.py

CHANGES.rst

@@ -5,6 +5,8 @@
 
 - Versions of Python <3.8 are no longer supported. [#217]
 
+- Fix erroneous attempt to import ``__main__.py`` by skipping it [#232]
+
 
 1.0.0 (2023-08-11)
 ==================

pytest_doctestplus/plugin.py

@@ -228,7 +228,7 @@ def collect(self):
                 fspath = self.fspath
                 filepath = self.fspath.basename
 
-            if filepath == "setup.py":
+            if filepath in ("setup.py", "__main__.py"):
                 return
             elif filepath == "conftest.py":
                 if PYTEST_GE_7_0:

tests/test_doctestplus.py

@@ -1097,6 +1097,24 @@ class MyClass:
     assert ("something()\nUNEXPECTED EXCEPTION: NameError" in report.longreprtext) is cont_on_fail
 
 
+def test_main(testdir):
+    pkg = testdir.mkdir('pkg')
+    code = dedent(
+        '''
+        def f():
+            raise RuntimeError("This is a CLI, do not execute module while doctesting")
+
+        f()
+        '''
+    )
+    pkg.join('__init__.py').write_text("", "utf-8")
+    main_path = pkg.join('__main__.py')
+    main_path.write_text(code, "utf-8")
+
+    testdir.inline_run(pkg).assertoutcome(passed=0)
+    testdir.inline_run(pkg, '--doctest-plus').assertoutcome(passed=0)
+
+
 def test_ufunc(testdir):
     pytest.importorskip('numpy')