JUnit Assumptions - assumingThat Example

In this article, we will discuss the Assumptions assumingThat() method with an example.

The assumingThat() method executes the supplied Executable if the assumption is valid. If the assumption is invalid, this method does nothing. We can use this for logging or notifications when our assumptions are valid.

JUnit Assumptions - assumingThat Example

Assumptions class provides many overloaded assumingThat() methods and the below Java program demonstrates the same.

package junit5.assumptions.assumingThat;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assumptions.assumeTrue;
import static org.junit.jupiter.api.Assumptions.assumingThat;

import org.junit.jupiter.api.Test;

public class AssumingThatDemo {

	@Test
	public void assumingThatWithBooleanCondition() {
		assumingThat("DEV".equals(System.getProperty("ENV")), () -> {
			System.out.println("Dev environment !!!");
			assertEquals(5, 3 + 2);
		});
		// below code gets executed in every environment
		System.out.println("Executed in every environment !!!");
		assertEquals(3, 2 + 1);
	}
	
	@Test
	public void assumingThatWithBooleanSupplier() {
		assumingThat(() -> "DEV".equals(System.getProperty("ENV")), () -> {
			System.out.println("Dev environment !!!");
			assertEquals(5, 3 + 2);
		});
		// below code gets executed in every environment
		System.out.println("Executed in every environment !!!");
		assertEquals(3, 2 + 1);
	}
	
}

Run JUnit test Class

Run the JUnit test class to execute all the JUnit test cases and here is the output:


Free Spring Boot Tutorial | Full In-depth Course | Learn Spring Boot in 10 Hours


Watch this course on YouTube at Spring Boot Tutorial | Fee 10 Hours Full Course

Comments