add version range test for none scheme

Signed-off-by: Kunz, Immanuel <immanuel.kunz@aisec.fraunhofer.de>

Author: immqu

tests/test_version_range.py

@@ -562,3 +562,8 @@ def test_version_range_none():
     none_vers = VersionRange.from_string("vers:none/*")    
     assert not none_vers.contains(Version("1.2.3"))
     assert PypiVersion("2.0.3") not in none_vers
+    # test for invalid all range specification
+    with pytest.raises(Exception):
+        VersionRange.from_string("vers:none/!1.2.3")
+    with pytest.raises(Exception):
+        VersionRange.from_string("vers:none/*|>1.2.3")