Unit test with JUnit 5

Question

Hi all i receive Nullpointer when trying to execute this unit test.I want to test e class which receive 3 parameters and returns a string. I think i need to make @Before or something else but it didn't works. Do you have suggestions...Thanks !

public class UrlConstructorTest { private UrlConstructor urlConstructor; @Before public void setUp() { urlConstructor = new UrlConstructor(); } public static final String TEST_UPDATE_MANIFEST_SR = "/packages/proxyId/test/test1/123/test3/test_test"; @Test public void constructUpdateManifestSrInSasTokenTest() { String result = urlConstructor.composeDeviceRegistrationUrl("test","test123","test"); System.out.println(result); assertNotNull(result); assertEquals(TEST, result); } }

UrlConstructor is define like this:

@Component public class UrlConstructor {

And this is the method in this class:

 public String composeDUrl(String deviceId, String scopeId) { return String.format(Constants.socpe, tes, test); }

Test, you provided, passes for me without any NullPointer with simple UrlConstructor implementation always returning expected string. — Eugene Botyanovsky
– Eugene Botyanovsky, Commented May 4, 2021 at 5:27
I added that my UrlConstructor is with @Component. When i debug it i see that urlConstructor is comming null. Am i define it wrong?.. — Liverpool
– Liverpool, Commented May 4, 2021 at 5:33
try using @Autowired private UrlConstructor urlConstructor; — Bishal Gautam
– Bishal Gautam, Commented May 4, 2021 at 5:37
post more of your UrlConstructor Class. Just because you instantiate your UrlConstructor does not mean that all the dependant beans are autowired. Have a look at docs.spring.io/spring-boot/docs/2.1.5.RELEASE/reference/html/… — Andreas Radauer
– Andreas Radauer, Commented May 4, 2021 at 5:46
btw @Before is JUnit 4, @BeforeEach is the equivalent for JUnit 5. — Hopey One
– Hopey One, Commented May 4, 2021 at 5:48

Liverpool · Accepted Answer · 2021-05-04 12:39:45Z

In Junit5, you should be using @BeforeEach. Or you can get rid of that setUp method completely.

public class UrlConstructorTest { private final UrlConstructor urlConstructor = new UrlConstructor(); public static final String TEST_SR = "/packages/proxyId/testID/product/testscope/testcomponent/coomponent_up"; @Test public void constructTest() { String result = urlConstructor.composeDeviceRegistrationUrl("testID","coomponent_up","testscope"); System.out.println(result); assertNotNull(result); assertEquals(TEST_SR, result); } }

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