assertequals junit code example

Example 1: java testing with assertions

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

public class AssertionExample {

    /**
     * The assertionExample function
     * uses multiple assertions for the purpose of example;
     * Usually in one method it is recommended to have 1 assertion;
     */
    @Test
    public void assertionExample()
    {
        Assertions.assertEquals(2+2,4);

        Assertions.assertNotEquals(6+3,10);

        Assertions.assertTrue("Radu".length()==4);

        String tester = null;

        Assertions.assertThrows(NullPointerException.class,()->tester.equals("emptyString"));
    }
}

Example 2: assert multiple junit

public void shouldTellIfPrime(){
    Assertions.assertAll(
            () -> assertTrue(isPrime(2)),
            () -> assertFalse(isPrime(4))
    );
}

Example 3: what is assertion in junit

soft assertion:
	 -There is no soft assert in junit.
      Only testNG has it.	
	- Soft assert: won't stop the execution
      if assertion fails.
	- Soft assert methods are not static,
      so we must create the object of the class.
	- It displayS the recorded result at the end.

   I use soft assertion when functionality is NOT
     very critical.
     
     
hard assertion:
    - Hard assert: will stop the execution
      of the test when it fails.
	- The line we have the hard assert, if fails,
      rest of the lines will not be executed.
	- Hard assertion methods are static,
     therefore we are able to use them without
     having to create the object of the class.


SYNTAX===
hard assertion:
	Assert.assertEquals(ExpectedStr,ActualStr);
    
soft assertion:
	SoftAssert softAssert = new SoftAssert();
    softAssert.assertTrue(2<1);