https://www.tutorialspoint.com/junit/index.htm

Here are some exercises: 

-bash-4.2$ pwd
/u/dgerman/c212-workspace
-bash-4.2$ ls -l
total 4
drwxr-xr-x 15 dgerman faculty 4096 Jul  7 13:22 exercises
drwxr-xr-x  2 dgerman faculty   35 Jul  6 20:54 JUNIT
-bash-4.2$ ls -ld .setup
-rw-r--r-- 1 dgerman faculty 161 Jul  6 21:05 .setup
-bash-4.2$ cat .setup
JAVA_HOME=/usr/lib/jvm/java-1.8.0
export JAVA_HOME

JUNIT_HOME=~/c212-workspace/JUNIT
export JUNIT_HOME

CLASSPATH=$JUNIT_HOME/junit-4.10.jar:.
export CLASSPATH
-bash-4.2$ source .setup
-bash-4.2$ echo $JAVA_HOME
/usr/lib/jvm/java-1.8.0
-bash-4.2$ echo $JUNIT_HOME
/u/dgerman/c212-workspace/JUNIT
-bash-4.2$ echo $CLASSPATH
/u/dgerman/c212-workspace/JUNIT/junit-4.10.jar:.
-bash-4.2$ tree $JUNIT_HOME
/u/dgerman/c212-workspace/JUNIT
└── junit-4.10.jar

0 directories, 1 file
-bash-4.2$ tree exercises/
exercises/
├── 001
│   ├── TestJunit.java
│   └── TestRunner.java
├── 002
│   ├── JavaTest.java
│   ├── JunitTestSuite.java
│   ├── TestJunit1.java
│   ├── TestJunit2.java
│   └── TestRunner.java
├── 003
│   ├── MessageUtil.java
│   ├── TestJunit.java
│   └── TestRunner.java
├── 004
│   ├── JunitTestSuite.java
│   ├── TestJunit1.java
│   ├── TestJunit2.java
│   ├── TestJunit3.java
│   ├── TestRunner1.java
│   ├── TestRunner2.java
│   └── TestRunner3.java
├── 005
│   ├── EmpBusinessLogic.java
│   ├── EmployeeDetails.java
│   ├── TestEmployeeDetails.java
│   └── TestRunner.java
├── 006
│   ├── JunitAnnotation.java
│   ├── TestAssertions.java
│   ├── TestRunner2.java
│   └── TestRunner.java
├── 007
│   ├── ExecutionProcedureJunit.java
│   └── TestRunner.java
├── 008
│   ├── MessageUtil.java
│   ├── TestJunit.java
│   └── TestRunner.java
├── 009
│   ├── JunitTestSuite.java
│   ├── MessageUtil.java
│   ├── TestJunit1.java
│   ├── TestJunit2.java
│   └── TestRunner.java
├── 010
│   ├── MessageUtil.java
│   ├── TestJunit.java
│   └── TestRunner.java
├── 011
│   ├── MessageUtil.java
│   ├── TestJunit.java
│   └── TestRunner.java
├── 012
│   ├── MessageUtil.java
│   ├── TestJunit.java
│   └── TestRunner.java
└── 013
    ├── PrimeNumberChecker.java
    ├── PrimeNumberCheckerTest.java
    └── TestRunner.java

13 directories, 47 files
-bash-4.2$

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