How to use JUnit without using Maven(Graddle or any build automation tool)?

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I'm trying to use as little setup as possible to create an ambient for unit tests for my java code using JUnit Console Launcher.

Following the classes created for testing:

SumTest.java

import static org.junit.jupiter.api.Assertions.assertEquals;
    
public class SumTest {
    
    @Test
    public void sumTest() {
        assertEquals(10, sum(1,0));        
    }
}

Sum.java

public class Sum {
    public int sum(int a, int b) {
        return a + b;
    }
}

Command:

 $ java -jar junit-platform-console-standalone-1.8.2.jar -o SumTest.java

Output:

Thanks for using JUnit! Support its development at https://junit.org/sponsoring

╷
├─ JUnit Jupiter ✔
└─ JUnit Vintage ✔

Test run finished after 88 ms
[         2 containers found      ]
[         0 containers skipped    ]
[         2 containers started    ]
[         0 containers aborted    ]
[         2 containers successful ]
[         0 containers failed     ]
[         0 tests found           ]
[         0 tests skipped         ]
[         0 tests started         ]
[         0 tests aborted         ]
[         0 tests successful      ]
[         0 tests failed          ]

I expected to have a falling test. But my test wasn't recognized.

automated-tests junit terminal unit-testing java
1 Answers

First of all, my Java was wrong. Second I wasn't using the right commands.

Following the steps:

  1. Download JUnit Console Launcher jar
  2. Compile class needed for the test with the jar you just downloaded
  3. Execute test specifying the class you want to test(there a lot of option on how to chose classes and methods)

The commands I ran:

$ Var=junit-platform-console-standalone-1.8.2.jar
$ curl https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.8.2/junit-platform-console-standalone-1.8.2.jar --output $Var
$ javac -cp "junit-platform-console-standalone-1.8.2.jar" Sum.java SumTest.java
$ java -jar junit-platform-console-standalone-1.8.2.jar -cp "." --select-class SumTest

The classes corrected:

SumTest.java

import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class SumTest {
    @Test
    public void sumTest() {
        assertEquals(10, Sum.sum(5, 5));
    }

    @Test
    public void sumTest2() {
        assertEquals(10, Sum.sum(4, 5));
    }
}

Sum.java

public class Sum {
    static int sum(int a, int b) {
        return a + b;
    }
}

Result of the tests:

Thanks for using JUnit! Support its development at https://junit.org/sponsoring

╷
├─ JUnit Jupiter ✔
└─ JUnit Vintage ✔
   └─ SumTest ✔
      ├─ sumTest ✔
      └─ sumTest2 ✘ expected:<10> but was:<9>

Failures (1):
  JUnit Vintage:SumTest:sumTest2
    MethodSource [className = 'SumTest', methodName = 'sumTest2', methodParameterTypes = '']
    => java.lang.AssertionError: expected:<10> but was:<9>
       org.junit.Assert.fail(Assert.java:89)
       org.junit.Assert.failNotEquals(Assert.java:835)
       org.junit.Assert.assertEquals(Assert.java:647)
       org.junit.Assert.assertEquals(Assert.java:633)
       SumTest.sumTest2(SumTest.java:12)
       java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
       java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       java.base/java.lang.reflect.Method.invoke(Method.java:568)
       org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
       [...]

Test run finished after 135 ms
[         3 containers found      ]
[         0 containers skipped    ]
[         3 containers started    ]
[         0 containers aborted    ]
[         3 containers successful ]
[         0 containers failed     ]
[         2 tests found           ]
[         0 tests skipped         ]
[         2 tests started         ]
[         0 tests aborted         ]
[         1 tests successful      ]
[         1 tests failed          ]
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