clean code refactorings

- add description to assertions in unit tests
- make inner classes static
- remove out-commented code

Signed-off-by: Michael Hirsch <michael.hirsch@bosch-si.com>

hawkbit-rest-resource/src/test/java/org/eclipse/hawkbit/rest/resource/model/ExceptionInfoTest.java

@@ -32,10 +32,15 @@ public class ExceptionInfoTest {
         underTest.setMessage(knownMessage);
         underTest.setParameters(knownParameters);
 
-        assertThat(underTest.getErrorCode()).isEqualTo(knownErrorCode);
-        assertThat(underTest.getExceptionClass()).isEqualTo(knownExceptionClass);
-        assertThat(underTest.getMessage()).isEqualTo(knownMessage);
-        assertThat(underTest.getParameters()).isEqualTo(knownParameters);
+        assertThat(underTest.getErrorCode()).as("The error code should match with the known error code in the test")
+                .isEqualTo(knownErrorCode);
+        assertThat(underTest.getExceptionClass())
+                .as("The exception class should match with the known error code in the test")
+                .isEqualTo(knownExceptionClass);
+        assertThat(underTest.getMessage()).as("The message should match with the known error code in the test")
+                .isEqualTo(knownMessage);
+        assertThat(underTest.getParameters()).as("The parameters should match with the known error code in the test")
+                .isEqualTo(knownParameters);
     }
 
 }