Add unit test for diffpy.structure.__version__

news/version-test.rst

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+**Added:**
+
+* Unit test for version.py
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>

tests/test_version.py

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+"""Unit tests for __version__.py
+"""
+
+import diffpy.structure
+
+
+def test_package_version():
+    """Ensure the package version is defined and not set to the initial placeholder."""
+    assert hasattr(diffpy.structure, "__version__")
+    assert diffpy.structure.__version__ != "0.0.0"