Update tests => DONE

.../documentation/containers/documentation.component.spec.ts

src/app/documentation/store/documentation.action.spec.ts

src/app/documentation/store/documentation.reducer.spec.ts

src/app/documentation/store/documentation.selector.spec.ts

src/app/metamodel/action/attribute.action.spec.ts

src/app/metamodel/model/attributes-by-dataset.model.ts

src/app/metamodel/model/index.ts

src/app/metamodel/reducers/attribute.reducer.spec.ts

src/app/metamodel/selectors/attribute.selector.spec.ts