### Question:
GraphRelationshipMutation implements Mutation { @Override public Mutation deleteAttribute(Name name) { operatons.unsetAttributeValue(name); return this; } GraphRelationshipMutation(Relationship relationship,
            OperationPipeline pipeline,
            BatchMutation batchMutation); @Override Mutation setAttribute(Name name, Object value); @Override Mutation deleteAttribute(Name name); @Override com.intuit.ugc.api.BatchMutation ready(); @Override Mutation delete();  }### Answer:
@Test public void testDeleteAttribute(){ GraphRelationship graphRelationship = createGraphRelationship(); OperationPipeline pipeline = new OperationPipeline(); BatchMutation batchMutation = new MockBatchMutation(); GraphRelationshipMutation graphRelationshipMutation = new GraphRelationshipMutation(graphRelationship, pipeline, batchMutation ); Mutation deleteAttribute = graphRelationshipMutation.deleteAttribute(TartanImplTestConstants.ATTR_DUMMY_ATTRIBUTE_NAME); assertNotNull(deleteAttribute); }