/*
* 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 UnusedAnonymousClass}Test */
@RunWith(JUnit4.class)
public class UnusedAnonymousClassTest {
private CompilationTestHelper compilationHelper;
@Before
public void setUp() {
compilationHelper = CompilationTestHelper.newInstance(UnusedAnonymousClass.class, getClass());
}
@Test
public void deadObject() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"public class One {",
" public static void main(String[] args) {",
" new Object();",
" }",
"}")
.doTest();
}
// Thread has a known side-effect free constructor
@Test
public void deadThread() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"public class One {",
" public static void main(String[] args) {",
" // BUG: Diagnostic contains:",
" new Thread() {",
" public void run() {}",
" };",
" }",
"}")
.doTest();
}
@Test
public void liveObject() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"public class One {",
" public static void main(String[] args) {",
" new Object().toString();",
" }",
"}")
.doTest();
}
@Test
public void deadCallable() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"import java.util.concurrent.Callable;",
"public class One {",
" public static void main(String[] args) throws Exception {",
" // BUG: Diagnostic contains:",
" new Callable<Void>() {",
" public Void call() throws Exception {",
" return null;",
" }",
" };",
" }",
"}")
.doTest();
}
@Test
public void liveCallable() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"import java.util.concurrent.Callable;",
"public class One {",
" public static void main(String[] args) throws Exception {",
" new Callable<Void>() {",
" public Void call() throws Exception {",
" return null;",
" }",
" }.call();",
" }",
"}")
.doTest();
}
@Test
public void liveCallableViaCinit() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"import java.util.concurrent.Callable;",
"import java.util.ArrayList;",
"public class One {",
" static ArrayList<Callable<Void>> callables = new ArrayList<>();",
" public static void main(String[] args) throws Exception {",
" new Callable<Void>() {",
" { callables.add(this); }",
" public Void call() throws Exception {",
" return null;",
" }",
" };",
" }",
"}")
.doTest();
}
@Test
public void deadCallableWithField() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"import java.util.concurrent.Callable;",
"import java.util.ArrayList;",
"public class One {",
" public static void main(String[] args) throws Exception {",
" // BUG: Diagnostic contains:",
" new Callable<Void>() {",
" Void register;",
" public Void call() throws Exception {",
" return null;",
" }",
" };",
" }",
"}")
.doTest();
}
@Test
public void liveCallableViaField() throws Exception {
compilationHelper
.addSourceLines(
"a/One.java",
"package a;",
"import java.util.concurrent.Callable;",
"import java.util.ArrayList;",
"public class One {",
" static ArrayList<Callable<Void>> callables = new ArrayList<>();",
" static Void register(Callable<Void> callable) {",
" callables.add(callable);",
" return null;",
" }",
" public static void main(String[] args) throws Exception {",
" new Callable<Void>() {",
" Void register = register(this);",
" public Void call() throws Exception {",
" return null;",
" }",
" };",
" }",
"}")
.doTest();
}
}