[英]Unit test android application with retrofit2 and rxjava2
注意:我使用 () 而不是尖括號 <> 作為數據類型,因為找不到讓它們在論壇上工作的方法。
我有一個 MVP android 應用程序,它使用 Retofit2 和 RxJava2 從 GitHub Api 獲取數據。 代碼運行良好,我能夠恢復一個 Observable(Response(List(Headers))),其中 Response 來自 Retrofit2,Headers 來自 OkHttp3。
但是當涉及到單元測試時,我遇到了一個問題:我無法模擬 Response(List(Headers))。 Retrofit2 Response 類有一個私有構造函數,所以我無法創建它的實例。 然后我嘗試使用 OkHttp MockWebServer 的想法是有一個 MockResponse(List(Headers))。 盡管我可以將 Headers 設置為 MockResponse 實例,但我無法獲得 MockResponse(List(Headers))
我的服務:
@GET("users/{username}/repos")
Observable<Response<List<Headers>>> checkReposPerUser(@Path("username") String owner,
@Query("access_token") String accessTokenString,
@Query("token_type") String accessTokenTypeString,
@Query("per_page") String perPageValue);
我的主持人:
@Override
public void checkRepoPerUser(String owner) {
//recovering access token data from Shared Preferences;
String accessTokenString = repository.getAccessTokenString();
String accessTokenTypeString = repository.getAccessTokenType();
//Asking for a list of repositories with 1 repository per page.
//This let us know how many repositories we found and also to deal with error response code
Disposable disposable = repository.checkReposPerUser(owner, accessTokenString, accessTokenTypeString, "1")
.subscribeOn(ioScheduler)
.observeOn(uiScheduler)
.subscribe(this::handleReturnedHeaderData, this::handleHeaderError);
disposeBag.add(disposable);
}
@VisibleForTesting
public void handleReturnedHeaderData(Response<List<Headers>> response) {
//getting value 'Link' from response headers in order to count the repositories
String link = response.headers().get("Link");
String message = response.message();
//checking GitHub API requests limit
String limit = response.headers().get("X-RateLimit-Limit");
Log.d(TAG, "Limit requests: " + limit);
String limitRemaining = response.headers().get("X-RateLimit-Remaining");
Log.d(TAG, "Limit requests remaining: " + limitRemaining);
//getting http response code
int code = response.code();
switch (code){
case 404:
if(message.equalsIgnoreCase("not found")){ //User not exists
view.showUserNotFoundMessage();
}else{
view.showErrorMessage(message);
}
break;
case 403:
//GitHub API requests limit reached
//Instead of showing an error, we start the login process,
// store another access token in shared Preferences and resend the same request that failed before
view.startLogin();
break;
case 200:
if(link == null){ //Link value is not present into the header, it means there's 0 or 1 repo
Log.d(TAG, "Total repos for current user is 0 or 1.");
//get the repository
searchRepo(view.getOwner()); //Starting looking for data
}else if( link != null){
//get last page number: considering that we requested all the repos paginated with
//only 1 repo per page, the last page number is equal to the total number of repos
String totalRepoString = link.substring(link.lastIndexOf("&page=") + 6, link.lastIndexOf(">"));
Log.d(TAG, "Total repos for current user are " + totalRepoString);
// TODO once we know how many repositories we have, we can decide how many calls to do (total repositories/100 rounded up )
//get the repositories
searchRepo(view.getOwner()); //Starting 3 looking for data
}
break;
default:
searchRepo(view.getOwner()); //Starting 3 looking for data
break;
}
}
現在,我想對 handleReturnedHeaderData(Response(List(Headers)) response) 進行單元測試。 這是測試類:
public class RepositoriesPresenterTest {
private static final Repo REPO1 = new Repo();
private static final Repo REPO2 = new Repo();
private static final Repo REPO3 = new Repo();
private static final List<Repo> NO_REPOS = Collections.emptyList();
private static final List<Repo> THREE_REPOS = Arrays.asList(REPO1, REPO2, REPO3);
public static final String OWNER = "owner";
public static final String ACCESS_TOKEN_STRING = "access_token_string";
public static final String ACCESS_TOKEN_TYPE = "access_token_type";
public static final String PER_PAGE_VALUE = "per_page_value";
@Parameterized.Parameters
public static Object[] data() {
return new Object[] {NO_REPOS, THREE_REPOS};
}
@Parameterized.Parameter
public List<Repo> repos;
@Rule
public MockitoRule mockitoRule = MockitoJUnit.rule();
@Mock private GitHubChallengeRepository repositoryMock;
@Mock private RepositoriesContract.View viewMock;
@Mock private Response<List<Headers>> responseListHeaders;
private TestScheduler testScheduler;
private RepositoriesPresenter SUT; //System Under Test
@Before public void setUp() {
testScheduler = new TestScheduler();
SUT = new RepositoriesPresenter(repositoryMock, viewMock, testScheduler, testScheduler);
}
}
進入我嘗試過的 RepositoriesPresenterTest 類:
@Test public void repoPresenter_CheckRepoPerUser_responseHeadersListExpected() throws Exception {
// Mock a response with status 200 and some Headers
MockResponse mockResponse = new MockResponse()
.setResponseCode(200)
.setBody("{}")
.setHeader("Status", "status_value")
.setHeader("X-RateLimit-Limit", "60")
.setHeader("X-RateLimit-Remaining", "57");
List<Headers> headersList = Arrays.asList(mockResponse.getHeaders());
// Given
given(repositoryMock.getAccessTokenString()).willReturn(ACCESS_TOKEN_STRING);
given(repositoryMock.getAccessTokenType()).willReturn(ACCESS_TOKEN_TYPE);
given(repositoryMock.checkReposPerUser(
OWNER,
ACCESS_TOKEN_STRING,
ACCESS_TOKEN_TYPE,
PER_PAGE_VALUE)).willReturn((Observable<Response<List<Headers>>>) Observable.just(headersList));
// When
SUT.checkRepoPerUser(OWNER);
testScheduler.triggerActions();
// Then
then(viewMock).should().getOwner();
}
但它無法編譯,因為我無法將Observable.just(headersList)轉換為Observable(Response(List(Headers))) )。
之后我嘗試使用 MockWebServer 來模擬連接(即使我認為測試沒有必要):
@Test
public void repoPresenter_CheckRepoPerUser_responseHeadersListExpected() throws InterruptedException, IOException {
MockWebServer mockWebServer = new MockWebServer();
TestObserver testObserver = new TestObserver<Response<List<Headers>>>();
String path = "\"users/{username}/repos\"";
// Mock a response with status 200 and some Headers
MockResponse mockResponse = new MockResponse()
.setResponseCode(200)
.setBody("{}")
.setHeader("Status", "status_value")
.setHeader("X-RateLimit-Limit", "60")
.setHeader("X-RateLimit-Remaining", "57");
// Enqueue request
mockWebServer.enqueue(mockResponse);
// Call the API
repositoryMock.checkReposPerUser(
OWNER,
ACCESS_TOKEN_STRING,
ACCESS_TOKEN_TYPE,
PER_PAGE_VALUE).subscribe((Consumer<? super Response<List<Headers>>>) Observable.just(Arrays.asList(mockResponse.getHeaders()));
testScheduler.triggerActions();
testObserver.awaitTerminalEvent(2, TimeUnit.SECONDS);
// No errors
testObserver.assertNoErrors();
// Make sure we made the request to the required path
assertEquals("60", mockResponse.getHeaders().get("X-RateLimit-Limit"));
// When
SUT.checkRepoPerUser(OWNER);
testScheduler.triggerActions();
// Then
then(viewMock).should().getOwner();
// Shut down the server. Instances cannot be reused.
mockWebServer.shutdown();
}
但我得到了一個 ClassCastException:
java.lang.ClassCastException: io.reactivex.internal.operators.observable.ObservableJust cannot be cast to io.reactivex.functions.Consumer
是否有任何可行的方法來模擬 Response(List(Headers)) 或者我應該開始考慮改變從端點獲取數據的方式?
使用改造自己的 Response 對象創建模擬響應非常簡單。 正如您所說,構造函數是私有的,但您可以使用靜態方法創建成功的響應:
Response<List<Headers>> response = Response.success(headersList);
例如,如果您想創建一個因 401 錯誤而失敗的響應,您可以這樣做:
ResponseBody theBody = ResponseBody.create(MediaType.parse("text/html"), "");
Response<List<Headers>> response = Response.error(401, theBody);
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