/*
 * Copyright 2020 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 static com.google.common.truth.TruthJUnit.assume;

import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link SystemOut}. */
@RunWith(JUnit4.class)
public class SystemOutTest {

  private final CompilationTestHelper helper =
      CompilationTestHelper.newInstance(SystemOut.class, getClass());

  @Test
  public void positive() {
    helper
        .addSourceLines(
            "Test.java",
            """
            import java.io.PrintStream;

            class Test {
              void f() {
                // BUG: Diagnostic contains: SystemOut
                System.out.println();
                // BUG: Diagnostic contains: SystemOut
                System.err.println();
                // BUG: Diagnostic contains: SystemOut
                p(System.out);
                // BUG: Diagnostic contains: SystemOut
                p(System.err);
                // BUG: Diagnostic contains: SystemOut
                Thread.dumpStack();
                // BUG: Diagnostic contains: SystemOut
                new Exception().printStackTrace();
              }

              private void p(PrintStream ps) {}
            }
            """)
        .doTest();
  }

  @Test
  public void positiveIoPrint() {
    assume().that(Runtime.version().feature()).isAtLeast(25);
    helper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void main() {
                // BUG: Diagnostic contains: SystemOut
                IO.print("hello JDK 25");
                // BUG: Diagnostic contains: SystemOut
                IO.println();
                // BUG: Diagnostic contains: SystemOut
                IO.println("hello JDK 25");
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negative() {
    helper
        .addSourceLines(
            "Test.java",
            """
            import java.io.*;

            class Test {
              void f() {
                new Exception().printStackTrace(new PrintStream((OutputStream) null));
                new Exception().printStackTrace(new PrintWriter((OutputStream) null));
              }
            }
            """)
        .doTest();
  }
}
