JUnit assertFalse example

Alvin ReyesJuly 14th, 2015Last Updated: March 21st, 2019

0 1,414 1 minute read

1. Introduction

To follow through with my previous post about assertTrue, this will tackle about the exact opposite of that function. The assertFalse. The assertFalse is basically a function that can be used to check if a specific logic or process will return a false statement.

This can be in any conditional or structural logic that will return a boolean true or false. See the code example below.

2. The Source

JUnitAssertFalseExample.java

package com.areyes1.jgc.junit.assertfalse;

import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.assertFalse;

public class JUnitAssertFalseExample {

	int totalNumberOfApplicants = 0;
	int totalNumberOfAcceptableApplicants = 10;

	@Before
	public void setData() {
		this.totalNumberOfApplicants = 9;
	}

	@Test
	public void testAssertFalseFalse() {
		assertFalse((this.totalNumberOfApplicants != this.totalNumberOfAcceptableApplicants));
	}
	
	@Test
	public void testAssertFalse() {
		assertFalse((this.totalNumberOfApplicants == this.totalNumberOfAcceptableApplicants));
	}

	@Test
	public void testAssertFalseWithMessage() {
		assertFalse(
				"Is total number of applicants acceptable?",
				(this.totalNumberOfApplicants != this.totalNumberOfAcceptableApplicants));
	}

}

The assertFalse is basically a function that can take any conditional statement that can either return a boolean (true or false). Developers can use it to test negative impacts and black box testing schemes.