JUnit Source Code Files are provided in the source package file, junit-4.13.2-sources.jar.

You can browse JUnit Source Code files below:

⏎ org/junit/internal/runners/TestClass.java

package org.junit.internal.runners;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.internal.MethodSorter;
import org.junit.runners.BlockJUnit4ClassRunner;

/**
 * @deprecated Included for backwards compatibility with JUnit 4.4. Will be
 *             removed in the next major release. Please use
 *             {@link BlockJUnit4ClassRunner} in place of {@link JUnit4ClassRunner}.
 */
@Deprecated
public class TestClass {
    private final Class<?> klass;

    public TestClass(Class<?> klass) {
        this.klass = klass;
    }

    public List<Method> getTestMethods() {
        return getAnnotatedMethods(Test.class);
    }

    List<Method> getBefores() {
        return getAnnotatedMethods(BeforeClass.class);
    }

    List<Method> getAfters() {
        return getAnnotatedMethods(AfterClass.class);
    }

    public List<Method> getAnnotatedMethods(Class<? extends Annotation> annotationClass) {
        List<Method> results = new ArrayList<Method>();
        for (Class<?> eachClass : getSuperClasses(klass)) {
            Method[] methods = MethodSorter.getDeclaredMethods(eachClass);
            for (Method eachMethod : methods) {
                Annotation annotation = eachMethod.getAnnotation(annotationClass);
                if (annotation != null && !isShadowed(eachMethod, results)) {
                    results.add(eachMethod);
                }
            }
        }
        if (runsTopToBottom(annotationClass)) {
            Collections.reverse(results);
        }
        return results;
    }

    private boolean runsTopToBottom(Class<? extends Annotation> annotation) {
        return annotation.equals(Before.class) || annotation.equals(BeforeClass.class);
    }

    private boolean isShadowed(Method method, List<Method> results) {
        for (Method each : results) {
            if (isShadowed(method, each)) {
                return true;
            }
        }
        return false;
    }

    private boolean isShadowed(Method current, Method previous) {
        if (!previous.getName().equals(current.getName())) {
            return false;
        }
        if (previous.getParameterTypes().length != current.getParameterTypes().length) {
            return false;
        }
        for (int i = 0; i < previous.getParameterTypes().length; i++) {
            if (!previous.getParameterTypes()[i].equals(current.getParameterTypes()[i])) {
                return false;
            }
        }
        return true;
    }

    private List<Class<?>> getSuperClasses(Class<?> testClass) {
        List<Class<?>> results = new ArrayList<Class<?>>();
        Class<?> current = testClass;
        while (current != null) {
            results.add(current);
            current = current.getSuperclass();
        }
        return results;
    }

    public Constructor<?> getConstructor() throws SecurityException, NoSuchMethodException {
        return klass.getConstructor();
    }

    public Class<?> getJavaClass() {
        return klass;
    }

    public String getName() {
        return klass.getName();
    }

}

⏎ org/junit/internal/runners/TestClass.java

Or download all of them as a single archive file:

File name: junit-4.13.2-sources.jar
File size: 234540 bytes
Release date: 2021-02-13
Download 

⇒ Download and Install junit-4.12.jar

⇐ Download and Install junit-4.13.2.jar

⇑ Download and Install JUnit (Java Unit) Testing

⇑⇑ FAQ for JUnit (Java Unit) Testing