Test backwards compatibility shim

Author: maxrjones

tests/test_version.py

@@ -0,0 +1,15 @@
+import numcodecs
+
+
+def test_version():
+    assert isinstance(numcodecs.__version__, str)
+    assert numcodecs.__version__
+
+
+def test_version_module():
+    from numcodecs.version import __version__, version
+
+    assert isinstance(__version__, str)
+    assert isinstance(version, str)
+    assert __version__ == version
+    assert __version__ == numcodecs.__version__