Assertions.java

package cucumber.runtime.junit;

import cucumber.runtime.CucumberException;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

public class Assertions {
    private Assertions() {
    }

    public static void assertNoCucumberAnnotatedMethods(Class clazz) {
        for (Method method : clazz.getDeclaredMethods()) {
            for (Annotation annotation : method.getAnnotations()) {
                if (annotation.annotationType().getName().startsWith("cucumber")) {
                    throw new CucumberException(
                            "\n\n" +
                                    "Classes annotated with @RunWith(Cucumber.class) must not define any\n" +
                                    "Step Definition or Hook methods. Their sole purpose is to serve as\n" +
                                    "an entry point for JUnit. Step Definitions and Hooks should be defined\n" +
                                    "in their own classes. This allows them to be reused across features.\n" +
                                    "Offending class: " + clazz + "\n"
                    );
                }
            }
        }
    }
}