Merge cf2abe4 into b4ed5ce

requirements-test.txt

@@ -1,2 +1,2 @@
+--editable .[test]
 --requirement requirements.txt
--e .[test]

src/example/__main__.py

@@ -0,0 +1,5 @@
+"""Code to run if this package is used as a Python module."""
+
+from .example import main
+
+main()

src/example/example.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 """example is an example Python library and tool.
 
 Divide one integer by another and log the result. Also log some information

tests/test_example.py

@@ -44,6 +44,18 @@ def test_stdout_version(capsys):
     ), "standard output by '--version' should agree with module.__version__"
 
 
+def test___main__(capsys):
+    """Verify that the __main__.py file loads correctly."""
+    with pytest.raises(SystemExit):
+        with patch.object(sys, "argv", ["bogus", "--version"]):
+            # cisagov Libraries
+            import example.__main__  # noqa: F401
+    captured = capsys.readouterr()
+    assert (
+        captured.out == f"{PROJECT_VERSION}\n"
+    ), "standard output by '--version' should agree with module.__version__"
+
+
 @pytest.mark.skipif(
     RELEASE_TAG in [None, ""], reason="this is not a release (RELEASE_TAG not set)"
 )