Tim Werner

I have tried to mock the File creation in order to replace it with a dummy file.
File fileDummy =  new File("c:\\temp\\aa"); whenNew(File.class).withAnyArguments().thenReturn(fileDummy);
However I'm getting NullPointerException.

I have managed to solve the issue however I don't know how to mock a local variable like String folderLocation = propsDocu.getProperty(OUTPUT_FOLDER);

Hello all,

I want to test that a file is getting created by the following method from KClient calss:

static void createImageFileBasedOnStream(String outputFileName, HttpURLConnection connURL) throws IOException { InputStream inStream = null; inStream = connURL.getInputStream(); // String folderLocation = propsDocu.getProperty(OUTPUT_FOLDER); String folderLocation = "C:\\temp"; try (OutputStream out = new FileOutputStream(new File(folderLocation + outputFileName))) { byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = inStream.read(buffer)) != -1) { out.write(buffer, 0, bytesRead); } inStream.close(); } }
my JUnit test is

@RunWith(PowerMockRunner.class) @PrepareForTest({KClient.class}) public class KVSClientTest { /* * @Mock HttpURLConnection httpURLConnectionMock; * * @InjectMocks KClient KClientMock; */ @Test public void testFileCreation() throws Exception { HttpURLConnection httpURLConnectionMock = PowerMockito.mock(HttpURLConnection.class); String outputDummy = "DummyFileName"; mockStatic(KVSClient.class); when(httpURLConnectionMock.getInputStream()).thenReturn(IOUtils.toInputStream("ala bala", "UTF-8")); KVSClient.createImageFileBasedOnStream(outputDummy, httpURLConnectionMock); // Whitebox.invokeMethod(KVSClientMock, "createImageFileBasedOnStream", outputDummy, httpURLConnectionMock ); Mockito.verify(httpURLConnectionMock,Mockito.times(1)).getInputStream(); PowerMockito.verifyStatic(KVSClient.class); } }
however no file is being created in expected location and also in Unit log the following message is displayed:

Wanted but not invoked java.net.HttpURLConnection.getInputStream();
Actually, there were zero interactions with this mock.

What can be the reason for such a behaviour.

Regards,

Hello,

I need your help with the following issue related with Junit testing:


I have the following class under test:

public class ExceptionUtil { public ExceptionUtil() { } public static String stackToString(Throwable t) { StackTraceElement[] stack = t.getStackTrace(); StringBuilder theTrace = new StringBuilder(""); for(StackTraceElement line : stack) {   theTrace.append(line.toString()+"\n"); } return theTrace.toString(); } }

and the following unit test

import static org.junit.Assert.*; import org.junit.runner.RunWith; import org.mockito.InjectMocks; import org.mockito.Mock; import org.junit.Test; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; import static org.powermock.api.mockito.PowerMockito.*; import java.util.ArrayList; import java.util.List; @RunWith(PowerMockRunner.class) @PrepareForTest({ExceptionUtil.class}) public class ExceptionUtilTest { @Mock Throwable throwMock; @InjectMocks ExceptionUtil exMock; @Test public void test() { mockStatic(ExceptionUtil.class); //Throwable throwMock = mock(Throwable.class); //ExceptionUtil exMock = spy(new ExceptionUtil()); List<StackTraceElement> listStackDummy = new ArrayList<StackTraceElement>(); listStackDummy.add(new StackTraceElement("Dummy Class 1", "Dummy method", "dummy file", 100)); listStackDummy.add(new StackTraceElement("Dummy Class 2", "Dummy method s", "dummy file 2" , 200)); StackTraceElement[] stackArrayDummy = listStackDummy.toArray(new StackTraceElement[listStackDummy.size()]); PowerMockito.when(throwMock.getStackTrace()).thenReturn(stackArrayDummy); // assertEquals("res",ExceptionUtil.stackToString(throwMock)); ExceptionUtil.stackToString(new Throwable()); ExceptionUtil.stackToString(Mockito.any()); PowerMockito.verifyStatic(Mockito.times(2)); } }

when I uncomment the  "assertEquals("res",ExceptionUtil.stackToString(throwMock));" code I'm getting a null object returned.

java.lang.AssertionError: expected:<res> but was:<null>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:834)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:144)
at com.vw.client.test.ExceptionUtilTest.test(ExceptionUtilTest.java:44)

I've tried to debug the method under test with Junit but without any success.

What I'm doing wrong?

Regards,