Add unit tests for version

tests/python/unit/test_version.py

@@ -0,0 +1,27 @@
+"""Tests for version access
+
+Ensures that `compass.__version__` is exposed and semantically shaped.
+We allow dev/local forms produced by setuptools_scm
+(e.g., 0.11.3.dev8+gHASH).
+"""
+
+import re
+
+import compass
+
+
+SEMVER_DEV_PATTERN = re.compile(r"^\d+\.\d+\.\d+(?:\.dev\d+\+g[0-9a-f]+)?$")
+
+
+def test_version_string_present():
+    """`__version__` attribute exists, is a non-empty string"""
+    assert hasattr(compass, "__version__")
+    assert isinstance(compass.__version__, str)
+    assert compass.__version__  # non-empty
+
+
+def test_version_semantic_shape():
+    """Version matches dev semver pattern"""
+    v = compass.__version__
+    assert SEMVER_DEV_PATTERN.match(v)
+    assert v != "9999"