如何从头开始运行 JUnit 类或测试方法

Question

I have JUnit tests located in different test folders, when I'm running them one by one everything is green all tests are passed in particular folder, but when its done in scope (all at once), some tests are failing due to some data is changed during previous tests execution. So it's a way to run JUnit tests from scratch, I've tried

mvn "-Dtest=TestClass1,TestClass2" test

but some tests are failed. When its done like:

mvn "-Dtest=TestClass1" test

all passed. Or when:

`mvn "-Dtest=TestClass2" test

all passed.

Answer 1

As long as TestClass1 and TestClass2 share common state there might be no way to run them together eg it could be a static field somewhere in the JVM. You must refactor the tests so they are isolated and have no side effects eg use @Before and @After to clean up resources after the test.

You could play with Maven Surefire Plugin options to spawn a new JVM for each test but it would be very inefficient.

Answer 2

For this specific problem, you can create a TestSuite.

Create Two Test Suite Classes Attach @RunWith(Suite.class) Annotation with the class.

import org.junit.runner.RunWith;
import org.junit.runners.Suite;

@RunWith(Suite.class)

@Suite.SuiteClasses({
   TestJunit1.class
})

public class JunitTestSuite1 {   
}  


@RunWith(Suite.class)

    @Suite.SuiteClasses({
       TestJunit2.class
    })

    public class JunitTestSuite2 {   
    }  


public class TestRunner {
   public static void main(String[] args) {
      Result result1 = JUnitCore.runClasses(JunitTestSuite1.class);
      Result result2 = JUnitCore.runClasses(JunitTestSuite2.class);

      for (Failure failure : result1.getFailures()) {
         System.out.println(failure.toString());
      }
      for (Failure failure : result2.getFailures()) {
         System.out.println(failure.toString());
      }


      System.out.println(result1.wasSuccessful());
      System.out.println(result2.wasSuccessful());
   }
}