初步检查：
首先检查您的JRE是否安装好。您应该可以打开一个终端，并键入 javac 而不会收到任何错误，并查看使用选项：

Preliminary checks: first check your JRE is installed ok. You should be able to open a terminal and type javac without getting any errors, and see the usage options:

Usage: javac <options> <source files>
where possible options include:
...

同时键入 whereis javac 将为您提供安装java编译器的路径。当我在OSX安装中键入这个，我得到 / usr / bin / javac 。你应该得到一些路径显示给你没有错误。假设全部检出，我们来安装jUnit。请按照以下步骤操作。

Also typing whereis javac will give you the path of where your java compiler is installed. When I type this on my OSX installation, I get /usr/bin/javac. You should get some path shown to you with no errors. Assuming that all checks out, let's install jUnit. Follow the steps below.

1. 下载.jar文件。转到 https://github.com/junit-team/junit/wiki/Download-and-Install ，然后单击链接的junit.jar 。找到最新稳定版本的行，然后在下载列下单击jar链接。这将下载一个文件 junit-X.Y.jar 。重复此操作，并下载最新的稳定版本的hamcrest：下载 hamcrest-core-XX.YY.jar


2. 创建jUnit主文件夹。我们需要创建一个文件夹，并将.jars放在这个文件夹中。我建议您通过运行 cd&&&&&&&          mkdir java 。然后运行 cp〜/ Downloads / {junit-X.Y.jar，hamcrest-core-XX.YY.jar}〜/ java / 复制两个.jars。 （替换 X ， Y ， XX ， YY 相应）。 [注意：如果文件夹位置变得不方便，不要担心，您可以随时更改jUnit文件夹]。



3. 编辑您的类路径。我们现在需要编辑我们的 .bash_profile 文件将这些文件添加到我们的类路径中（如果您使用zsh编辑您的 .zshrc $ file
   
   

1. Download the .jar files. Go to https://github.com/junit-team/junit/wiki/Download-and-Install and click the link for junit.jar. Find the row for the latest stable release then under the downloads column click 'jar' link. This will download a file junit-X.Y.jar. Repeat this again and download the latest stable release for hamcrest: download hamcrest-core-XX.YY.jar
2. Create a jUnit Home folder. We need to create a folder and put the .jars you downloaded into this folder. I suggest creating a java folder in your home directory by running cd && mkdir java. Then running cp ~/Downloads/{junit-X.Y.jar,hamcrest-core-XX.YY.jar} ~/java/ to copy the two .jars there. (replace X, Y, XX, YY accordingly). [Note: If the folder placement becomes an inconvenience, don't worry, you can change the jUnit folder at any later date].

3. Edit your classpath. We now need to edit our .bash_profile file to add these files to our classpath (if you are using zsh edit your .zshrc file).

export JUNIT_HOME="$HOME/java"
export PATH="$PATH:$JUNIT_HOME"
export CLASSPATH="$CLASSPATH:$JUNIT_HOME/junit-X.Y.jar:$JUNIT_HOME/hamcrest-core-XX.YY.jar"

import junit.framework.TestCase;
public class TestBasic extends TestCase {
  public void testTrue() {
    assertTrue(true);
  }
}

现在cd进入 java 目录运行 javac TestBasic.java 后跟 java org.junit .runner.JUnitCore TestBasic 。如果一切正常，那么您将得到如下输出：

Now cd into the java directory run javac TestBasic.java followed by java org.junit.runner.JUnitCore TestBasic. If everything is ok, then you will get an output like:

JUnit version 4.11
.
Time: 0.006

OK (1 test)