add tests

Author: michaelkedar

osv/ecosystems/alpine_test.py

@@ -74,6 +74,12 @@ def test_apk(self):
         ecosystem.sort_key('13.0.14.5-r1'), ecosystem.sort_key('7.64.3-r2'))
     self.assertLess(
         ecosystem.sort_key('13.0.14.5-r1'), ecosystem.sort_key('16.6-r0'))
+    
+    # Double check >= / <= methods: https://github.com/google/osv.dev/pull/3978
+    self.assertGreaterEqual(
+        ecosystem.sort_key('1.10.0-r0'), ecosystem.sort_key('1.2.0-r0'))
+    self.assertLessEqual(
+        ecosystem.sort_key('1.2.0-r0'), ecosystem.sort_key('1.10.0-r0'))
 
   def test_apk_ecosystems(self):
     """Test apk-based ecosystems return an APK ecosystem."""