如何對(duì)使用try-with-resources的方法進(jìn)行單元測(cè)試？由于它在try子句中使用new運(yùn)算符，因此無(wú)法對(duì)其進(jìn)行模擬。我不想使用PowerMock?？磥?lái)唯一的方法就是創(chuàng)建集成測(cè)試？public void methodToBeTested(File file) { try (FileInputStream fis = new FileInputStream(file)) { //some logic I want to test which uses fis object } catch (Exception e) { //print stacktrace }}
1 回答
開(kāi)心每一天1111
TA貢獻(xiàn)1836條經(jīng)驗(yàn) 獲得超13個(gè)贊
您可以將依賴項(xiàng)實(shí)例化移動(dòng)到工廠類中，并將其作為構(gòu)造函數(shù)參數(shù)傳遞給要測(cè)試的代碼。工廠類本身太簡(jiǎn)單而不會(huì)失敗，因此不需要進(jìn)行測(cè)試。
您是否打算做類似的事情：
try (FileInputStream fis = getCreatedFromFactory(file)) ??
– JavaIntern
幾乎...
@Singleton
public class InputStreamFactory { // too simple to fail -> no UnitTests
public InputStream createFor(File file) throws IOException, FileNotFoundException {
retrun new FileInputStream(file);
}
}
class UnitUnderTest {
private final InputStreamFactory inputStreamFactory;
UnitUnderTest(@Inject InputStreamFactory inputStreamFactory){
this.inputStreamFactory=inputStreamFactory;
}
public void methodToBeTested(File file) {
try (FileInputStream fis = inputStreamFactory.createFor(file)) {
//some logic I want to test which uses fis object
} catch (Exception e) {
//print stacktrace
}
}
}
class UnitUnderTestTest{
@Rule
public MockitoRule rule = MockitoJUnit.rule();
@Mock
private InputStreamFactory inputStreamFactory;
@Mock
private InputStream inputStream;
private final File inputFile = new File("whatever");
// no init here, mock for inputStream not yet created
private UnitUnderTest unitUnderTest;
/* I don't use @InjectMocks
since it does not cause compile error
if constructor misses parameter */
@Before
public void setup() {
unitUnderTest = new UnitUnderTest(inputStreamFactory);
doReturn(inputStream).when(inputStreamFactory).createFor(any(File.class);
}
@Test
public void createsInputStreamFromFilePassed() {
// arrange
/* nothing to do */
// act
new UnitUnderTest(inputStreamFactory).methodToBeTested(inputFile);
// assert
verify(inputStreamFactory).createFor(inputFile);
verify(inputStream).close();
}
}
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