79 lines
2.1 KiB
Java
79 lines
2.1 KiB
Java
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package sop.util;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import org.junit.jupiter.api.Test;
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public class OptionalTest {
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@Test
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public void testEmpty() {
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Optional<String> optional = new Optional<>();
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assertEmpty(optional);
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}
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@Test
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public void testArg() {
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String string = "foo";
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Optional<String> optional = new Optional<>(string);
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assertFalse(optional.isEmpty());
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assertTrue(optional.isPresent());
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assertEquals(string, optional.get());
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}
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@Test
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public void testOfEmpty() {
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Optional<String> optional = Optional.ofEmpty();
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assertEmpty(optional);
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}
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@Test
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public void testNullArg() {
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Optional<String> optional = new Optional<>(null);
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assertEmpty(optional);
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}
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@Test
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public void testOfWithNullArgThrows() {
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assertThrows(NullPointerException.class, () -> Optional.of(null));
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}
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@Test
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public void testOf() {
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String string = "Hello, World!";
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Optional<String> optional = Optional.of(string);
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assertFalse(optional.isEmpty());
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assertTrue(optional.isPresent());
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assertEquals(string, optional.get());
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}
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@Test
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public void testOfNullableWithNull() {
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Optional<String> optional = Optional.ofNullable(null);
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assertEmpty(optional);
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}
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@Test
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public void testOfNullableWithArg() {
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Optional<String> optional = Optional.ofNullable("bar");
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assertEquals("bar", optional.get());
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assertFalse(optional.isEmpty());
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assertTrue(optional.isPresent());
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}
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private <T> void assertEmpty(Optional<T> optional) {
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assertTrue(optional.isEmpty());
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assertFalse(optional.isPresent());
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assertNull(optional.get());
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}
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}
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