func testDeleteAndGetProjectReturnsNilWithSync()

in AmplifyPlugins/DataStore/AWSDataStoreCategoryPluginIntegrationTests/TransformerV2/DataStoreConnectionScenario1V2Tests.swift [275:365]
82 lines of code
15 McCabe index (conditional complexity)

    func testDeleteAndGetProjectReturnsNilWithSync() throws {
        try startAmplifyAndWaitForSync()
        guard let team = saveTeam(name: "name"),
              let project = saveProject(project1V2TeamId: team.id) else {
            XCTFail("Could not save team and project")
            return
        }
        let createReceived = expectation(description: "received created items from cloud")
        createReceived.expectedFulfillmentCount = 2 // 1 project and 1 team
        let deleteReceived = expectation(description: "Delete notification received")
        deleteReceived.expectedFulfillmentCount = 2 // 1 project and 1 team
        let hubListener = Amplify.Hub.listen(to: .dataStore,
                                             eventName: HubPayload.EventName.DataStore.syncReceived) { payload in
            guard let mutationEvent = payload.data as? MutationEvent else {
                XCTFail("Could not cast payload to mutation event")
                return
            }

            if let projectEvent = try? mutationEvent.decodeModel() as? Project1V2,
               projectEvent.id == project.id {
                if mutationEvent.mutationType == GraphQLMutationType.create.rawValue {
                    XCTAssertEqual(mutationEvent.version, 1)
                    createReceived.fulfill()
                } else if mutationEvent.mutationType == GraphQLMutationType.delete.rawValue {
                    deleteReceived.fulfill()
                }

            } else if let teamEvent = try? mutationEvent.decodeModel() as? Team1V2, teamEvent.id == team.id {
                if mutationEvent.mutationType == GraphQLMutationType.create.rawValue {
                    XCTAssertEqual(mutationEvent.version, 1)
                    createReceived.fulfill()
                } else if mutationEvent.mutationType == GraphQLMutationType.delete.rawValue {
                    deleteReceived.fulfill()
                }
            }

        }
        guard try HubListenerTestUtilities.waitForListener(with: hubListener, timeout: 5.0) else {
            XCTFail("Listener not registered for hub")
            return
        }
        wait(for: [createReceived], timeout: TestCommonConstants.networkTimeout)

        let deleteProjectSuccessful = expectation(description: "delete project")
        Amplify.DataStore.delete(project) { result in
            switch result {
            case .success:
                deleteProjectSuccessful.fulfill()
            case .failure(let error):
                XCTFail("\(error)")
            }
        }
        wait(for: [deleteProjectSuccessful], timeout: TestCommonConstants.networkTimeout)

        // TODO: Delete Team should not be necessary, cascade delete should delete the team when deleting the project.
        // Once cascade works for hasOne, the following code can be removed.
        let deleteTeamSuccessful = expectation(description: "delete team")
        Amplify.DataStore.delete(team) { result in
            switch result {
            case .success:
                deleteTeamSuccessful.fulfill()
            case .failure(let error):
                XCTFail("\(error)")
            }
        }
        wait(for: [deleteTeamSuccessful, deleteReceived], timeout: TestCommonConstants.networkTimeout)

        let getProjectAfterDeleteCompleted = expectation(description: "get project after deleted complete")
        Amplify.DataStore.query(Project1V2.self, byId: project.id) { result in
            switch result {
            case .success(let project):
                XCTAssertNil(project)
                getProjectAfterDeleteCompleted.fulfill()
            case .failure(let error):
                XCTFail("\(error)")
            }
        }
        wait(for: [getProjectAfterDeleteCompleted], timeout: TestCommonConstants.networkTimeout)

        let getTeamIsEmptySuccess = expectation(description: "get team after deleted project complete")
        Amplify.DataStore.query(Team1V2.self, byId: team.id) { result in
            switch result {
            case .success(let team):
                XCTAssertNil(team)
                getTeamIsEmptySuccess.fulfill()
            case .failure(let error):
                XCTFail("\(error)")
            }
        }
        wait(for: [getTeamIsEmptySuccess], timeout: TestCommonConstants.networkTimeout)
    }