google3/third_party/java_src/junit/test/java/junit/tests/runner/TextRunnerSingleMethodTest.java

package junit.tests.runner;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import junit.framework.TestCase;
import junit.textui.ResultPrinter;
import junit.textui.TestRunner;

/**
 * Test invoking a single test method of a TestCase.
 */
public class TextRunnerSingleMethodTest extends TestCase {

    static boolean fgWasInvoked;

    public static class InvocationTest extends TestCase {

        public void testWasInvoked() {
            TextRunnerSingleMethodTest.fgWasInvoked = true;
        }

        public void testNotInvoked() {
            fail("Shouldn't get here.");
        }
    }

    public void testSingle() throws Exception {
        TestRunner t = new TestRunner();
        t.setPrinter(new ResultPrinter(new PrintStream(new ByteArrayOutputStream())));
        String[] args = {
                "-m", "junit.tests.runner.TextRunnerSingleMethodTest$InvocationTest.testWasInvoked"
        };
        fgWasInvoked = false;
        t.start(args);
        assertTrue(fgWasInvoked);
    }

}