How to run a single method in a JUnit 4 test class?

Question

I have looked at all the similar questions, but in my opinion, none of them give a solid answer to this. I have a test class (JUnit 4 but also interested in JUnit 3) and I want to run individual test methods from within those classes programmatically/dynamically (not from the command line). Say, there are 5 test methods but I only want to run 2. How can I achieve this programmatically/dynamically (not from the command line, Eclipse etc.).

Also, there is the case where there is a @Before annotated method in the test class. So, when running an individual test method, the @Before should run beforehand as well. How can that be overcome?

Thanks in advance.

Answer 1

This is a simple single method runner. It's based on JUnit 4 framework but can run any method, not necessarily annotated with @Test

    private Result runTest(final Class<?> testClazz, final String methodName)
            throws InitializationError {
        BlockJUnit4ClassRunner runner = new BlockJUnit4ClassRunner(testClazz) {
            @Override
            protected List<FrameworkMethod> computeTestMethods() {
                try {
                    Method method = testClazz.getMethod(methodName);
                    return Arrays.asList(new FrameworkMethod(method));

                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        };
        Result res = new Result();
        runner.run(res);
        return res;
    }

    class Result extends RunNotifier {
        Failure failure;

        @Override
        public void fireTestFailure(Failure failure) {
            this.failure = failure;
        };

        boolean isOK() {
            return failure == null;
        }

        public Failure getFailure() {
            return failure;
        }
    }