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AssertNullAssertionsTests.java
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AssertNullAssertionsTests.java
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/*
* Copyright 2015-2021 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.AssertionTestUtils.assertExpectedAndActualValues;
import static org.junit.jupiter.api.AssertionTestUtils.assertMessageEquals;
import static org.junit.jupiter.api.AssertionTestUtils.assertMessageMatches;
import static org.junit.jupiter.api.AssertionTestUtils.expectAssertionFailedError;
import static org.junit.jupiter.api.Assertions.assertNull;
import java.util.function.Supplier;
import org.opentest4j.AssertionFailedError;
/**
* Unit tests for JUnit Jupiter {@link Assertions}.
*
* @since 5.0
*/
class AssertNullAssertionsTests {
@Test
void assertNullWithNull() {
assertNull(null);
assertNull(null, "message");
assertNull(null, () -> "message");
}
@Test
void assertNullWithNullAndMessageSupplier() {
assertNull(null, () -> "test");
}
@Test
void assertNullWithNonNullObject() {
try {
assertNull("foo");
expectAssertionFailedError();
}
catch (AssertionFailedError ex) {
assertMessageEquals(ex, "expected: <null> but was: <foo>");
assertExpectedAndActualValues(ex, null, "foo");
}
}
@Test
void assertNullWithNonNullObjectWithNullStringReturnedFromToString() {
assertNullWithNonNullObjectWithNullStringReturnedFromToString(null);
}
@Test
void assertNullWithNonNullObjectWithNullStringReturnedFromToStringAndMessageSupplier() {
assertNullWithNonNullObjectWithNullStringReturnedFromToString(() -> "boom");
}
private void assertNullWithNonNullObjectWithNullStringReturnedFromToString(Supplier<String> messageSupplier) {
String actual = "null";
try {
if (messageSupplier == null) {
assertNull(actual);
}
else {
assertNull(actual, messageSupplier);
}
expectAssertionFailedError();
}
catch (AssertionFailedError ex) {
// Should look something like:
// expected: <null> but was: java.lang.String@264b3504<null>
String prefix = (messageSupplier != null ? messageSupplier.get() + " ==> " : "");
assertMessageMatches(ex, prefix + "expected: <null> but was: java\\.lang\\.String@.+<null>");
assertExpectedAndActualValues(ex, null, actual);
}
}
@Test
void assertNullWithNonNullObjectWithNullReferenceReturnedFromToString() {
assertNullWithNonNullObjectWithNullReferenceReturnedFromToString(null);
}
@Test
void assertNullWithNonNullObjectWithNullReferenceReturnedFromToStringAndMessageSupplier() {
assertNullWithNonNullObjectWithNullReferenceReturnedFromToString(() -> "boom");
}
private void assertNullWithNonNullObjectWithNullReferenceReturnedFromToString(Supplier<String> messageSupplier) {
Object actual = new NullToString();
try {
if (messageSupplier == null) {
assertNull(actual);
}
else {
assertNull(actual, messageSupplier);
}
expectAssertionFailedError();
}
catch (AssertionFailedError ex) {
// Should look something like:
// expected: <null> but was: org.junit.jupiter.api.AssertNullAssertionsTests$NullToString@4e7912d8<null>
String prefix = (messageSupplier != null ? messageSupplier.get() + " ==> " : "");
assertMessageMatches(ex, prefix
+ "expected: <null> but was: org\\.junit\\.jupiter\\.api\\.AssertNullAssertionsTests\\$NullToString@.+<null>");
assertExpectedAndActualValues(ex, null, actual);
}
}
@Test
void assertNullWithNonNullObjectAndMessage() {
try {
assertNull("foo", "a message");
expectAssertionFailedError();
}
catch (AssertionFailedError ex) {
assertMessageEquals(ex, "a message ==> expected: <null> but was: <foo>");
assertExpectedAndActualValues(ex, null, "foo");
}
}
@Test
void assertNullWithNonNullObjectAndMessageSupplier() {
try {
assertNull("foo", () -> "test");
expectAssertionFailedError();
}
catch (AssertionFailedError ex) {
assertMessageEquals(ex, "test ==> expected: <null> but was: <foo>");
assertExpectedAndActualValues(ex, null, "foo");
}
}
private static class NullToString {
@Override
public String toString() {
return null;
}
}
}