A JUnit Runner that behaves like the default runner on Windows and ignores all tests on other operating systems.

OnlyOnWindowsRunner.java

//http://www.apache.org/licenses/LICENSE-2.0
package nl.fnord.junit;

import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;

/**
 * A JUnit {@code Runner} that behaves like the default runner on Windows and
 * ignores all tests on other operating systems.
 * <h3>Usage:</h3>
 * <pre>
 * &#64;RunWith(OnlyOnWindowsRunner.class)
 * public class SomeClassTest {
 *     &#64;Test
 *     public void testSomethingWindowsSpecific() {
 *         // etc.
 *     }
 * }
 * </pre>
 */
public class OnlyOnWindowsRunner extends BlockJUnit4ClassRunner {

    public OnlyOnWindowsRunner(Class<?> klass) throws InitializationError {
        super(klass);
    }

    @Override
    protected void runChild(FrameworkMethod method, RunNotifier notifier) {
        isWindows()
            ? super.runChild(method, notifier)
            : notifier.fireTestIgnored(getDescription);
    }

    /**
     * @return whether the host OS is windows.
     */
    private boolean isWindows() {
        // This can probably be improved.
        return System.getProperty("os.name").indexOf("Windows") > -1;
    }
}