/*
 * Copyright 2019 The Error Prone Authors.
 *
 * 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 CacheLoaderNull}Test */
@RunWith(JUnit4.class)
public class CacheLoaderNullTest {

  private final CompilationTestHelper compilationHelper =
      CompilationTestHelper.newInstance(CacheLoaderNull.class, getClass());

  @Test
  public void positive() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.cache.CacheLoader;

            class Test {
              {
                new CacheLoader<String, String>() {
                  @Override
                  public String load(String key) {
                    // BUG: Diagnostic contains:
                    return null;
                  }
                };
                abstract class MyCacheLoader extends CacheLoader<String, String> {}
                new MyCacheLoader() {
                  @Override
                  public String load(String key) {
                    // BUG: Diagnostic contains:
                    return null;
                  }
                };
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negative() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import com.google.common.cache.CacheLoader;
            import java.util.function.Supplier;

            class Test {
              public String load(String key) {
                return null;
              }

              {
                new CacheLoader<String, String>() {
                  @Override
                  public String load(String key) {
                    Supplier<String> s =
                        () -> {
                          return null;
                        };
                    Supplier<String> t =
                        new Supplier<String>() {
                          public String get() {
                            return null;
                          }
                        };
                    class MySupplier implements Supplier<String> {
                      public String get() {
                        return null;
                      }
                    }
                    ;
                    return "";
                  }
                };
              }
            }
            """)
        .doTest();
  }
}
