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NullMarkedTest.java
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NullMarkedTest.java
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/*
* Copyright 2018-2020 The JSpecify Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jspecify.nullness;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assumptions.assumeFalse;
import static org.junit.jupiter.api.Assumptions.assumeTrue;
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
@DisplayName("@NullMarked")
class NullMarkedTest {
boolean isJava8() {
String version = System.getProperty("java.version");
return version.startsWith("1.8");
}
Set<String> loadTargets() {
return Arrays.stream(NullMarked.class.getAnnotation(Target.class).value())
.map(ElementType::toString)
.collect(Collectors.toSet());
}
@Nested
@DisplayName("with Java 8")
class WithJava8 {
@BeforeEach
void assumeJava8() {
assumeTrue(isJava8());
}
@Test
void basicReflectionDoesNotThrowException() {
Object unused = NullMarked.class.getMethods();
/*
* But reading the *annotations* on NullMarked would result in an exception: Those annotations
* include @Target, which refers to MODULE, which doesn't exist under Java 8.
*
* (It happens to fail with ArrayStoreException.)
*/
assertThrows(ArrayStoreException.class, NullMarked.class::getAnnotations);
}
}
@Nested
@DisplayName("with Java 9+")
class WithJava9OrLater {
@BeforeEach
void assumeJava9OrLater() {
assumeFalse(isJava8());
}
@Test
void annotationIncludesModuleAsTarget() {
Set<String> targets = loadTargets();
assertEquals(
new HashSet<String>(Arrays.asList("TYPE", "METHOD", "CONSTRUCTOR", "PACKAGE", "MODULE")),
targets);
}
}
}