/*
 * Copyright 2017 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;

/**
 * @author mariasam@google.com (Maria Sam)
 */
@RunWith(JUnit4.class)
public class OptionalNotPresentTest {

  private final CompilationTestHelper compilationTestHelper =
      CompilationTestHelper.newInstance(OptionalNotPresent.class, getClass());

  @Test
  public void negativeCases() {
    compilationTestHelper.addSourceFile("OptionalNotPresentNegativeCases.java").doTest();
  }

  @Test
  public void positiveCases() {
    compilationTestHelper.addSourceFile("OptionalNotPresentPositiveCases.java").doTest();
  }

  @Test
  public void b80065837() {
    compilationTestHelper
        .addSourceLines(
            "Test.java", //
            "import java.util.Optional;",
            "import java.util.Map;",
            "class Test {",
            "  <T> Optional<T> f(T t) {",
            "    return Optional.ofNullable(t);",
            "  }",
            "  int g(Map<String, Optional<Integer>> m) {",
            "    if (!m.get(\"one\").isPresent()) {",
            "      return m.get(\"two\").get();",
            "    }",
            "    return -1;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void negation_butNotNegatingOptionalCheck() {
    compilationTestHelper
        .addSourceLines(
            "Test.java",
            "import java.util.Optional;",
            "class Test {",
            "  int g(Optional<Integer> o) {",
            "    if (!equals(this) && o.isPresent()) {",
            "      return o.orElseThrow();",
            "    }",
            "    return -1;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void isEmpty() {
    compilationTestHelper
        .addSourceLines(
            "Test.java",
            "import java.util.Optional;",
            "class Test {",
            "  int g(Optional<Integer> o) {",
            "    if (o.isEmpty()) {",
            "      // BUG: Diagnostic contains:",
            "      return o.get();",
            "    }",
            "    return -1;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void orElseThrow() {
    compilationTestHelper
        .addSourceLines(
            "Test.java",
            "import java.util.Optional;",
            "class Test {",
            "  int g(Optional<Integer> o) {",
            "    if (o.isEmpty()) {",
            "      // BUG: Diagnostic contains:",
            "      return o.orElseThrow();",
            "    }",
            "    return -1;",
            "  }",
            "}")
        .doTest();
  }
}
