/*
* Copyright 2017 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.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** {@link PredicateIncompatibleType}Test */
@RunWith(JUnit4.class)
public class PredicateIncompatibleTypeTest {
private final CompilationTestHelper testHelper =
CompilationTestHelper.newInstance(PredicateIncompatibleType.class, getClass());
@Test
public void positive() {
testHelper
.addSourceLines(
"Test.java",
"import java.util.List;",
"import java.util.stream.Stream;",
"class Test {",
" Stream<Integer> f(List<Integer> lx) {",
" // BUG: Diagnostic contains: Using String::equals as Predicate<Integer>;",
" return lx.stream().filter(\"\"::equals);",
" }",
"}")
.doTest();
}
@Test
public void negative() {
testHelper
.addSourceLines(
"Test.java",
"import java.util.List;",
"import java.util.stream.Stream;",
"class Test {",
" Stream<Integer> f(List<Integer> lx) {",
" return lx.stream().filter(Integer.valueOf(42)::equals);",
" }",
"}")
.doTest();
}
@Test
public void negativeHierarchy() {
testHelper
.addSourceLines(
"Test.java",
"import java.util.List;",
"import java.util.ArrayList;",
"import java.util.LinkedList;",
"import java.util.stream.Stream;",
"class Test {",
" Stream<ArrayList<String>> f(List<ArrayList<String>> a, LinkedList<String> b) {",
" return a.stream().filter(a::equals);",
" }",
"}")
.doTest();
}
@Test
public void positive_guavaPredicate() {
testHelper
.addSourceLines(
"Test.java",
"import com.google.common.base.Predicate;",
"class Test {",
" void f(Integer x) {",
" // BUG: Diagnostic contains: Using Integer::equals as Predicate<String>;",
" Predicate<String> p = x::equals;",
" }",
"}")
.doTest();
}
@Test
public void notAPredicate() {
testHelper
.addSourceLines(
"Test.java",
"import java.util.List;",
"import java.util.function.BiFunction;",
"class Test {",
" void f() {",
" BiFunction<Object, Object, Boolean> f = Object::equals;",
" }",
"}")
.doTest();
}
}