/*
* Copyright 2015 Google Inc. All Rights Reserved.
*
* 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 com.google.errorprone.bugpatterns;
import com.google.errorprone.CompilationTestHelper;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** {@link NullableVoid}Test */
@RunWith(JUnit4.class)
public class NullableVoidTest {
private CompilationTestHelper compilationHelper;
@Before
public void setUp() {
compilationHelper = CompilationTestHelper.newInstance(NullableVoid.class, getClass());
}
@Test
public void positive() {
compilationHelper
.addSourceLines(
"Test.java",
"import javax.annotation.Nullable;",
"class Test {",
" // BUG: Diagnostic contains:",
" // void-returning methods should not be annotated with @Nullable",
" @Nullable void f() {}",
"}")
.doTest();
}
@Test
public void negativeNotAnnotated() {
compilationHelper
.addSourceLines("Test.java", "class Test {", " public void f() {}", "}")
.doTest();
}
@Test
public void negativeBoxedVoid() {
compilationHelper
.addSourceLines(
"Test.java",
"import javax.annotation.Nullable;",
"class Test {",
" @Nullable Void f() { return null; }",
"}")
.doTest();
}
// regression test for #418
@Test
public void typeParameter() {
compilationHelper
.addSourceLines(
"Nullable.java",
"import java.lang.annotation.ElementType;",
"import java.lang.annotation.Retention;",
"import java.lang.annotation.RetentionPolicy;",
"import java.lang.annotation.Target;",
"@Retention(RetentionPolicy.RUNTIME)",
"@Target(ElementType.TYPE_USE)",
"public @interface Nullable {}")
.addSourceLines(
"Test.java", //
"class Test {",
" <@Nullable T> void f(T t) {}",
"}")
.doTest();
}
}