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TypeParameterUnusedInFormalsTest.java
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TypeParameterUnusedInFormalsTest.java
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/*
* Copyright 2014 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;
@RunWith(JUnit4.class)
public class TypeParameterUnusedInFormalsTest {
private CompilationTestHelper compilationHelper;
@Before
public void setUp() {
compilationHelper = CompilationTestHelper.newInstance(new TypeParameterUnusedInFormals());
}
@Test
public void evilCastImpl() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" // BUG: Diagnostic contains:",
" // static Object doCast(Object o) { Object t = (Object) o; return t; }",
" static <T> T doCast(Object o) { T t = (T) o; return t; }",
"}")
);
}
@Test
public void leadingParam() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" // BUG: Diagnostic contains:",
" // static <U extends Object> Object doCast(U o) { Object t = (Object) o; return t; }",
" static <U extends Object, T> T doCast(U o) { T t = (T) o; return t; }",
"}")
);
}
@Test
public void trailingParam() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" // BUG: Diagnostic contains:",
" // static <U extends Object> Object doCast(U o) { Object t = (Object) o; return t; }",
" static <T, U extends Object> T doCast(U o) { T t = (T) o; return t; }",
"}")
);
}
@Test
public void leadingAndTrailingParam() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" // BUG: Diagnostic contains:",
" // static <V extends Object, U extends Object> Object doCast(U o, V v) { Object t = (Object) o; return t; }",
" static <V extends Object, T, U extends Object> T doCast(U o, V v) { T t = (T) o; return t; }",
"}")
);
}
@Test
public void superBound() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" // BUG: Diagnostic contains:",
" // static Number doCast(Object o) { return (Number) o; }",
" static <T extends Number> T doCast(Object o) { return (T) o; }",
"}")
);
}
@Test
public void okFBound() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" interface Foo<T> {}",
" static <T extends Foo<T>> T doCast(Object o) { return (T) o; }",
"}")
);
}
@Test
public void wildbound() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"package foo.bar;",
"class Test {",
" interface Foo<T> {}",
" // BUG: Diagnostic contains:",
" // static Foo<?> doCast(Object o) { return (Foo<?>) o; }",
" static <T extends Foo<?>> T doCast(Object o) { return (T) o; }",
"}")
);
}
@Test
public void okGenericFactory() throws Exception {
compilationHelper.assertCompileSucceeds(
compilationHelper.fileManager().forSourceLines("Test.java",
"import java.util.List;",
"class Test {",
" static <T> List<T> newList() { return null; }",
"}")
);
}
@Test
public void okWithParam() throws Exception {
compilationHelper.assertCompileSucceeds(
compilationHelper.fileManager().forSourceLines("Test.java",
"import java.util.List;",
"class Test {",
" static <T> T noop(T t) { return t; }",
"}")
);
}
@Test
public void okNotMyParam() throws Exception {
compilationHelper.assertCompileSucceeds(
compilationHelper.fileManager().forSourceLines("Test.java",
"import java.util.List;",
"class Test<T> {",
" T noop(T t) { return t; }",
"}")
);
}
@Test
public void okAlwaysThrows() throws Exception {
compilationHelper.assertCompileSucceeds(
compilationHelper.fileManager().forSourceLines("Test.java",
"class Test {",
" <T> T logAndThrow() { throw new RuntimeException(); }",
"}")
);
}
@Test
public void okAlwaysReturnsNull() throws Exception {
compilationHelper.assertCompileSucceeds(
compilationHelper.fileManager().forSourceLines("Test.java",
"class Test {",
" <T> T nullFactory() { return null; }",
"}")
);
}
@Test
public void badCast() throws Exception {
compilationHelper.assertCompileSucceedsWithMessages(
compilationHelper.fileManager().forSourceLines("Test.java",
"class Test {",
" // BUG: Diagnostic contains:",
" <T> T nullFactory() { return (T) null; }",
"}")
);
}
}