Change: Fix SourceApi unit tests

Author: n-thumann

tests/nvd/source/test_api.py

@@ -199,7 +199,7 @@ async def test_context_manager(self):
     async def test_sources_broken_response_return_exceptions(self):
         responses = create_source_responses(3)
         responses[1].json.return_value["sources"][0][
-            "published"
+            "last_modified"
         ] = "I'm an invalid date"
         self.http_client.get.side_effect = responses
 
@@ -220,7 +220,7 @@ async def test_sources_broken_response_return_exceptions(self):
     async def test_sources_broken_response(self):
         responses = create_source_responses(3)
         responses[1].json.return_value["sources"][0][
-            "published"
+            "last_modified"
         ] = "I'm an invalid date"
         self.http_client.get.side_effect = responses