/*
* Copyright 2016 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 StreamToString}Test */
@RunWith(JUnit4.class)
public class StreamToStringTest {
private CompilationTestHelper compilationHelper;
@Before
public void setUp() {
compilationHelper = CompilationTestHelper.newInstance(StreamToString.class, getClass());
}
@Test
public void positive() throws Exception {
compilationHelper
.addSourceLines(
"Test.java",
"import java.util.Arrays;",
"class Test {",
" public static void main(String[] args) {",
" // BUG: Diagnostic contains:",
" System.err.println(Arrays.asList(42).stream());",
" // BUG: Diagnostic contains:",
" Arrays.asList(42).stream().toString();",
" // BUG: Diagnostic contains:",
" String.valueOf(Arrays.asList(42).stream());",
" // BUG: Diagnostic contains:",
" String s = \"\" + Arrays.asList(42).stream();",
" }",
"}")
.doTest();
}
@Test
public void negative() throws Exception {
compilationHelper
.addSourceLines(
"Test.java",
"import java.util.Arrays;",
"import java.util.stream.Collectors;",
"class Test {",
" public static void main(String[] args) {",
" System.err.println(Arrays.asList(42).stream()",
" .map(String::valueOf).collect(Collectors.joining(\", \")));",
" String.valueOf(Arrays.asList(42).stream()",
" .map(String::valueOf).collect(Collectors.joining(\", \")));",
" String s = \"\" + Arrays.asList(42).stream()",
" .map(String::valueOf).collect(Collectors.joining(\", \"));",
" }",
"}")
.doTest();
}
}