Software_programming_Java_UnitTest

17:57:19

Junit Rule

1. global timeout

@Rule
public MethodRule globalTimeOut = new Timeout(20)

2. ExpectedException
@Rule
public ExceptedException

3.TemporaryFolder
@Rule
public TemporaryFolder = new TemporaryFolder();

 

** Important

package framework.Junit.harmcrest_Matcher;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

public class ExceptionWithExpectedRootCause {

    @Rule
    public ExpectedException thrown = ExpectedException.none();

    @Test
    public void validTest() {
        thrown.expect(new CustomExceptionMatcher().rootCauseCus_1(NullPointerException.class));
        throw new RuntimeException("Customer exception", new NullPointerException());
    }
    
   /* public Matcher<? extends Throwable> rootCauseOf(
            final Class<? extends Throwable> expectedCause){

        return new BaseMatcher(){
            @Override
            public boolean matches(Object candidate){

                if(!(candidate instanceof Throwable)){
                    return false;
                }

                Throwable cause = ((Throwable) candidate).getCause();

                if(cause == null){
                    return false;
                }

                return expectedCause.isAssignableFrom(cause.getClass());
            }

            @Override
            public void describeTo(Description description){
                description.appendText("Throwable with cause of type ");
                description.appendText(expectedCause.getSimpleName());
            }
        };*/

}

 

Temporary File Folder

package framework.Junit.harmcrest_Matcher;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.io.File;
import java.io.IOException;

import static junit.framework.TestCase.assertTrue;

public class TempFileSystemTest {

    @Rule
    public TemporaryFolder folder = new TemporaryFolder();

    @Test
    public void thisTempFileIsSquashedAfterTheTest() throws Exception {
        File file = folder.newFile("myTmpFile.json");
        assertTrue(file.exists());
    }

    @Test
    public void allJunkWillBeGoneAfterTheTestHasRun() throws IOException {
        File tmpDir = folder.newFolder("MyTmpDir");
        assertTrue(tmpDir.exists());
    }
}