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

The assumeTrue() assumption validates the given assumption to be true and if the assumption is true – the test proceed otherwise test execution is aborted.

JUnit Assumptions - assumeTrue Examples

Assumptions class provides many overloaded assumeTrue() methods, Let's see a few of them with an example.

assumeTrue(boolean assumption)

Validate the given assumption.

	@Test
	public void assumeTrueWithNoMessage() {
		assumeTrue("DEV".equals(System.getProperty("ENV")));
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}

assumeTrue(boolean assumption, String message)

Validate the given assumption with a message.

	@Test
	public void assumeTrueWithMessage() {
		assumeTrue("DEV".equals(System.getProperty("ENV")), "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}

assumeTrue(BooleanSupplier assumptionSupplier)

Validate the given assumption with Supplier implementation.

	@Test
	public void assumeTrueWithMessageSupplier() {
		assumeTrue("DEV".equals(System.getProperty("ENV")), () -> "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}

assumeTrue(boolean assumption, Supplier<String> messageSupplier)

	@Test
	public void assumeTrueWithBooleanSupplierAndMessage() {
		assumeTrue(() -> "DEV".equals(System.getProperty("ENV")), "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}

Complete JUnit Class

package junit5.assumptions.assumeTrue;

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

import org.junit.jupiter.api.Test;

public class AssumeTrueDemo {
	
	@Test
	public void assumeTrueWithNoMessage() {
		assumeTrue("DEV".equals(System.getProperty("ENV")));
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}
	
	@Test
	public void assumeTrueWithMessage() {
		assumeTrue("DEV".equals(System.getProperty("ENV")), "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}
	
	@Test
	public void assumeTrueWithMessageSupplier() {
		assumeTrue("DEV".equals(System.getProperty("ENV")), () -> "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}
	
	@Test
	public void assumeTrueWithBooleanSupplierAndNoMessage() {
		assumeTrue(() -> "DEV".equals(System.getProperty("ENV")));
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}
	
	@Test
	public void assumeTrueWithBooleanSupplierAndMessage() {
		assumeTrue(() -> "DEV".equals(System.getProperty("ENV")), "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}
	
	@Test
	public void assumeTrueWithBooleanSupplierAndMessageSupplier() {
		assumeTrue(() -> "DEV".equals(System.getProperty("ENV")), () -> "Assumption Failed !!!");
		
		System.out.println("Assumption passed !!!");
		assertEquals(3, 2 + 1);
	}
	
}

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