increase code coverage of notification-core to 80%

notification-core/src/test/java/org/opengroup/osdu/notification/di/CredentialHeadersProviderTest.java

@@ -54,7 +54,7 @@ public class CredentialHeadersProviderTest {
         when(serviceAccountJwtClient.getIdToken("opendes")).thenReturn("sampleAuthToken");
 
         DpsHeaders dpsHeaders = headersProvider.getObject();
-        assertNotNull(headersProvider.getObject());
+        assertNotNull(dpsHeaders);
         assertEquals(dpsHeaders.getHeaders().get("content-type"), "application/json");
         assertEquals(dpsHeaders.getHeaders().get("authorization"), "sampleAuthToken");
         assertEquals(dpsHeaders.getHeaders().get("data-partition-id"), "opendes");

notification-core/src/test/java/org/opengroup/osdu/notification/utils/NotificationFilterTest.java

@@ -18,6 +18,7 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.doNothing;
@@ -52,6 +53,7 @@ public class NotificationFilterTest {
 
         notificationFilter.doFilter(servletRequest, servletResponse, filterChain);
         assertNotNull(dpsHeaders.getHeaders().get("correlation-id"));
+        assertEquals(dpsHeaders.getHeaders().get("content-type"),"application/json");
 
     }
 }
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