How to log results of JUnit test to a file?

Question

I never used a logging mechanism before, but now I have requirement to log the results of my JUnit tests to a file.

I want to log the result of below test (whether pass, fail or throw exception) to a log file.

@Test
public void statusCode200() {
    Assert.assertEquals("Java class".getStatusCode(), 200);
}

Can someone please advise how to achieve this?

From the comments:

I am currently using this logging mechanism: – ginny singh 22 mins ago

fileHandler = new FileHandler(System.getProperty("user.dir")+"//ExecutionResults.log");
simpleFormatter = new SimpleFormatter(); 
StreamHandler sh = new StreamHandler(System.out, simpleFormatter); 
log.setUseParentHandlers(false); 
log.addHandler(sh);   
log.addHandler(fileHandler); 
fileHandler.setFormatter(simpleFormatter); 
fileHandler.setLevel(Level.ALL); 
log.setLevel(Level.ALL); 
log.config("Logger Configuration done."); 
fileHandler.close();

i am aware that console logs everything But i want to save results for later. Also if you close log, you ended up loosing all that unlike log file — ginny singh, Jun 16 '15 at 16:14
Why don't you just use a logging framework like Log4j or Logback? — JNYRanger, Jun 16 '15 at 16:16
You can export test report instead. So you will be able to review test results later. — Vitalii Elenhaupt, Jun 16 '15 at 16:17
fileHandler = new FileHandler(System.getProperty("user.dir")+"//ExecutionResults.log"); simpleFormatter = new SimpleFormatter(); StreamHandler sh = new StreamHandler(System.out, simpleFormatter); log.setUseParentHandlers(false); log.addHandler(sh); log.addHandler(fileHandler); fileHandler.setFormatter(simpleFormatter); fileHandler.setLevel(Level.ALL); log.setLevel(Level.ALL); log.config("Logger Configuration done."); fileHandler.close(); — ginny singh, Jun 16 '15 at 16:24
related: http://stackoverflow.com/questions/2385553/how-can-i-generate-an-html-report-for-junit-results — , Jun 16 '15 at 16:45

score 0 · Answer 1 · answered Dec 21 '17 at 14:57

You can use TestWatcher rule from the JUnit library

import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;

import java.io.IOException;
import java.io.PrintWriter;

public class LogJunitTests {
    private static StringBuilder builder = new StringBuilder();
    @AfterClass
    public static void afterClass() throws IOException {
        PrintWriter logFile = new PrintWriter("You Log Path", "UTF-8");
        logFile.write(builder.toString());
        logFile.close();
    }

    @Rule
    public TestWatcher watchman = new TestWatcher() {

        @Override
        protected void failed(Throwable e, Description description) {
            if (description != null) {
                builder.append(description);
            }
            if (e != null) {
                builder.append(' ');
                builder.append(e);
            }
            builder.append(" FAIL\n");
        }

        @Override
        protected void succeeded(Description description) {
            if (description != null) {
                builder.append(description);
            }
            builder.append(" OK\n");
        }
    };

    @Test
    public void test() {
        Assert.assertEquals("Java class", "Java class");
    }
}

How to log results of JUnit test to a file?

1 Answers1