/*
* Copyright 2013 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.matchers;
import static com.google.errorprone.matchers.Matchers.methodReturns;
import static org.junit.Assert.assertEquals;
import com.google.errorprone.VisitorState;
import com.google.errorprone.scanner.Scanner;
import com.google.errorprone.suppliers.Suppliers;
import com.sun.source.tree.MethodTree;
import java.util.ArrayList;
import java.util.List;
import org.junit.After;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* @author cpovirk@google.com (Chris Povirk)
*/
@RunWith(JUnit4.class)
public class MethodReturnsTest extends CompilerBasedAbstractTest {
final List<ScannerTest> tests = new ArrayList<ScannerTest>();
@After
public void tearDown() {
for (ScannerTest test : tests) {
test.assertDone();
}
}
@Test
public void returnsString() {
writeFile("A.java",
"public class A {",
" static String foo() { return null; }",
"}");
assertCompiles(fooReturnsType(true, "java.lang.String"));
}
@Test
public void notReturnsString() {
writeFile("A.java",
"public class A {",
" static int foo() { return 0; }",
"}");
assertCompiles(fooReturnsType(false, "java.lang.String"));
}
@Test
public void returnsInt() {
writeFile("A.java",
"public class A {",
" static int foo() { return 0; }",
"}");
assertCompiles(fooReturnsType(true, "int"));
}
private abstract static class ScannerTest extends Scanner {
abstract void assertDone();
}
private Scanner fooReturnsType(final boolean shouldMatch, final String typeString) {
ScannerTest test =
new ScannerTest() {
private boolean matched = false;
@Override
public Void visitMethod(MethodTree node, VisitorState visitorState) {
if (methodReturns(Suppliers.typeFromString(typeString)).matches(node, visitorState)) {
matched = true;
}
return super.visitMethod(node, visitorState);
}
@Override
void assertDone() {
assertEquals(matched, shouldMatch);
}
};
tests.add(test);
return test;
}
}