/*
* 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 LoopConditionChecker}Test */
@RunWith(JUnit4.class)
public class LoopConditionCheckerTest {
private final CompilationTestHelper compilationTestHelper =
CompilationTestHelper.newInstance(LoopConditionChecker.class, getClass());
@Test
public void positive() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" int h9() {",
" int sum = 0;",
" int i, j;",
" for (i = 0; i < 10; ++i) {",
" // BUG: Diagnostic contains:",
" for (j = 0; j < 10; ++i) {",
" sum += j;",
" }",
" }",
" return sum;",
" }",
"}")
.doTest();
}
@Test
public void positive_noUpdate() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" void f() {",
" // BUG: Diagnostic contains:",
" for (int i = 0; i < 10; ) {",
" }",
" }",
"}")
.doTest();
}
@Test
public void negative() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" int h9() {",
" int sum = 0;",
" int i, j;",
" for (i = 0; i < 10; ++i) {",
" for (j = 0; j < 10; ++i) {",
" sum += j;",
" j++;",
" }",
" }",
" return sum;",
" }",
"}")
.doTest();
}
@Test
public void negative_forExpression() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" void f() {",
" for (int i = 0; i < 10; i++) {",
" System.err.println(i);",
" }",
" }",
"}")
.doTest();
}
@Test
public void negative_noVariable() {
compilationTestHelper
.addSourceLines(
"Test.java",
"import java.util.Iterator;",
"class Test {",
" void f(Iterable<String> xs) {",
" Iterator<String> it = xs.iterator();",
" while (it.hasNext()) {",
" System.err.println(it.next());",
" }",
" }",
"}")
.doTest();
}
@Test
public void negative_noCondition() {
compilationTestHelper
.addSourceLines(
"Test.java", //
"class Test {",
" void f() {",
" for (;;) {}",
" }",
"}")
.doTest();
}
@Test
public void negative_noUpdate() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" void f() {",
" for (int i = 0; i < 10; ) {",
" i++;",
" }",
" }",
"}")
.doTest();
}
@Test
public void negative_conditionUpdate() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" void f() {",
" int i = 0;",
" while (i++ < 10) {}",
" }",
"}")
.doTest();
}
@Test
public void negative_field() {
compilationTestHelper
.addSourceLines(
"Test.java",
"class Test {",
" int i = 0;",
" void f() {",
" while (i < 10) {",
" g();",
" }",
" }",
" void g() {",
" i++;",
" }",
"}")
.doTest();
}
}