TEST: Check compatibility of vendored LooseVersion with distutils version

Author: effigies

nipype/external/tests/test_version.py

@@ -0,0 +1,34 @@
+import warnings
+
+import pytest
+
+from nipype.external.version import LooseVersion as Vendored
+
+with warnings.catch_warnings():
+    warnings.simplefilter("ignore")
+    try:
+        from distutils.version import LooseVersion as Original
+    except ImportError:
+        pytest.skip()
+
+@pytest.mark.parametrize("v1, v2",
+    [("0.0.0", "0.0.0"),
+     ("0.0.0", "1.0.0")])
+def test_LooseVersion_compat(v1, v2):
+    vend1, vend2 = Vendored(v1), Vendored(v2)
+    orig1, orig2 = Original(v1), Original(v2)
+
+    assert vend1 == orig1
+    assert orig1 == vend1
+    assert vend2 == orig2
+    assert orig2 == vend2
+    assert (vend1 == orig2) == (v1 == v2)
+    assert (vend1 < orig2) == (v1 < v2)
+    assert (vend1 > orig2) == (v1 > v2)
+    assert (vend1 <= orig2) == (v1 <= v2)
+    assert (vend1 >= orig2) == (v1 >= v2)
+    assert (orig1 == vend2) == (v1 == v2)
+    assert (orig1 < vend2) == (v1 < v2)
+    assert (orig1 > vend2) == (v1 > v2)
+    assert (orig1 <= vend2) == (v1 <= v2)
+    assert (orig1 >= vend2) == (v1 >= v2)