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Module "junit-jupiter-api" of JUnit 5.

There is a newer version: 5.11.3

/*
 * Copyright 2015-2024 the original author or authors.
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v2.0 which
 * accompanies this distribution and is available at
 *
 * https://www.eclipse.org/legal/epl-v20.html
 */

package org.junit.jupiter.api;

import static org.junit.jupiter.api.AssertionFailureBuilder.assertionFailure;

import java.util.function.Supplier;

/**
 * {@code AssertNull} is a collection of utility methods that support asserting
 * there is no object.
 *
 * @since 5.0
 */
class AssertNull {

	private AssertNull() {
		/* no-op */
	}

	static void assertNull(Object actual) {
		assertNull(actual, (String) null);
	}

	static void assertNull(Object actual, String message) {
		if (actual != null) {
			failNotNull(actual, message);
		}
	}

	static void assertNull(Object actual, Supplier messageSupplier) {
		if (actual != null) {
			failNotNull(actual, messageSupplier);
		}
	}

	private static void failNotNull(Object actual, Object messageOrSupplier) {
		assertionFailure() //
				.message(messageOrSupplier) //
				.expected(null) //
				.actual(actual) //
				.buildAndThrow();
	}

}