/*
 * 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.BugCheckerRefactoringTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** {@link ExpectedExceptionChecker}Test. */
@RunWith(JUnit4.class)
public class ExpectedExceptionCheckerTest {

  private final BugCheckerRefactoringTestHelper testHelper =
      BugCheckerRefactoringTestHelper.newInstance(ExpectedExceptionChecker.class, getClass());

  @Test
  public void expect() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Test;
            import org.junit.Rule;
            import org.hamcrest.CoreMatchers;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                if (true) {
                  Path p = Paths.get("NOSUCH");
                  thrown.expect(IOException.class);
                  thrown.expect(CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));
                  thrown.expectCause(CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));
                  thrown.expectMessage("error");
                  thrown.expectMessage(CoreMatchers.containsString("error"));
                  Files.readAllBytes(p);
                  assertThat(Files.exists(p)).isFalse();
                }
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
"""
import static com.google.common.truth.Truth.assertThat;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertThrows;

import java.io.IOException;
import java.nio.file.*;
import org.hamcrest.CoreMatchers;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

class ExceptionTest {
  @Rule ExpectedException thrown = ExpectedException.none();

  @Test
  public void test() throws Exception {
    if (true) {
      Path p = Paths.get("NOSUCH");
      IOException thrown = assertThrows(IOException.class, () -> Files.readAllBytes(p));
      assertThat(thrown, CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));
      assertThat(thrown.getCause(), CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));
      assertThat(thrown).hasMessageThat().contains("error");
      assertThat(thrown.getMessage(), CoreMatchers.containsString("error"));
      assertThat(Files.exists(p)).isFalse();
    }
  }
}
""")
        .doTest();
  }

  @Test
  public void noExceptionType() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import java.io.IOException;
            import java.nio.file.*;
            import org.hamcrest.CoreMatchers;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));
                Files.readAllBytes(p);
                Files.readAllBytes(p);
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.hamcrest.MatcherAssert.assertThat;
            import static org.junit.Assert.assertThrows;

            import java.io.IOException;
            import java.nio.file.*;
            import org.hamcrest.CoreMatchers;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                Throwable thrown =
                    assertThrows(
                        Throwable.class,
                        () -> {
                          Files.readAllBytes(p);
                          Files.readAllBytes(p);
                        });
                assertThat(thrown, CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));
              }
            }
            """)
        .doTest();
  }

  @Test
  public void noExpectations() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import java.io.IOException;
            import java.nio.file.*;
            import org.hamcrest.CoreMatchers;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(IOException.class);
                Files.readAllBytes(p);
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.junit.Assert.assertThrows;
            import java.io.IOException;
            import java.nio.file.*;
            import org.hamcrest.CoreMatchers;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                assertThrows(IOException.class, () -> Files.readAllBytes(p));
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void nonExpressionStatement() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(IOException.class);
                Files.readAllBytes(p);
                if (true) Files.readAllBytes(p);
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.junit.Assert.assertThrows;

            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                assertThrows(
                    IOException.class,
                    () -> {
                      Files.readAllBytes(p);
                      if (true) Files.readAllBytes(p);
                    });
              }
            }
            """)
        .doTest();
  }

  // https://github.com/hamcrest/JavaHamcrest/issues/27
  @Test
  public void isA_hasCauseThat() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Test;
            import org.junit.Rule;
            import org.hamcrest.CoreMatchers;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(IOException.class);
                thrown.expectCause(CoreMatchers.isA(IOException.class));
                thrown.expectCause(org.hamcrest.core.Is.isA(IOException.class));
                Files.readAllBytes(p);
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.junit.Assert.assertThrows;

            import java.io.IOException;
            import java.nio.file.*;
            import org.hamcrest.CoreMatchers;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                IOException thrown = assertThrows(IOException.class, () -> Files.readAllBytes(p));
                assertThat(thrown).hasCauseThat().isInstanceOf(IOException.class);
                assertThat(thrown).hasCauseThat().isInstanceOf(IOException.class);
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void typedMatcher() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Test;
            import org.junit.Rule;
            import org.hamcrest.Matcher;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();
              Matcher<IOException> matcher;

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(matcher);
                Files.readAllBytes(p);
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.hamcrest.MatcherAssert.assertThat;
            import static org.junit.Assert.assertThrows;

            import java.io.IOException;
            import java.nio.file.*;
            import org.hamcrest.Matcher;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();
              Matcher<IOException> matcher;

              @Test
              public void test() throws Exception {
                Path p = Paths.get("NOSUCH");
                IOException thrown = assertThrows(IOException.class, () -> Files.readAllBytes(p));
                assertThat(thrown, matcher);
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void nothingButAsserts() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                thrown.expect(RuntimeException.class);
                assertThat(false).isFalse();
                assertThat(true).isTrue();
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void test() throws Exception {
                assertThat(false).isFalse();
                assertThat(true).isTrue();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void removeExplicitFail() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.junit.Assert.fail;
            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Test;
            import org.junit.Rule;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void testThrow() throws Exception {
                thrown.expect(IOException.class);
                throw new IOException();
              }

              @Test
              public void one() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(IOException.class);
                Files.readAllBytes(p);
                assertThat(Files.exists(p)).isFalse();
                fail();
              }

              @Test
              public void two() throws Exception {
                Path p = Paths.get("NOSUCH");
                thrown.expect(IOException.class);
                Files.readAllBytes(p);
                assertThat(Files.exists(p)).isFalse();
                throw new AssertionError();
              }
            }
            """)
        .addOutputLines(
            "out/ExceptionTest.java",
            """
            import static com.google.common.truth.Truth.assertThat;
            import static org.junit.Assert.assertThrows;
            import static org.junit.Assert.fail;

            import java.io.IOException;
            import java.nio.file.*;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void testThrow() throws Exception {}

              @Test
              public void one() throws Exception {
                Path p = Paths.get("NOSUCH");
                assertThrows(IOException.class, () -> Files.readAllBytes(p));
                assertThat(Files.exists(p)).isFalse();
              }

              @Test
              public void two() throws Exception {
                Path p = Paths.get("NOSUCH");
                assertThrows(IOException.class, () -> Files.readAllBytes(p));
                assertThat(Files.exists(p)).isFalse();
              }
            }
            """)
        .doTest();
  }

  // https://github.com/google/error-prone/issues/1072
  @Test
  public void i1072() {
    testHelper
        .addInputLines(
            "in/ExceptionTest.java",
            """
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void testThrow(Class<? extends Throwable> clazz) throws Exception {
                thrown.expect(clazz);
                clazz.toString();
              }
            }
            """)
        .addOutputLines(
            "in/ExceptionTest.java",
            """
            import static org.junit.Assert.assertThrows;
            import org.junit.Rule;
            import org.junit.Test;
            import org.junit.rules.ExpectedException;

            class ExceptionTest {
              @Rule ExpectedException thrown = ExpectedException.none();

              @Test
              public void testThrow(Class<? extends Throwable> clazz) throws Exception {
                assertThrows(Throwable.class, () -> clazz.toString());
              }
            }
            """)
        .doTest();
  }
}
