SwitchDefaultTest.java

/*
 * 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 static org.junit.Assume.assumeTrue;

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

/** {@link SwitchDefault}Test */
@RunWith(JUnit4.class)
public class SwitchDefaultTest {

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

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

  @Test
  public void refactoring_groupAndCase() {
    testHelper
        .addInputLines(
            "in/Test.java", //
            "class Test {",
            "  void f(int i) {",
            "    switch (i) {",
            "      default:",
            "      case 0:",
            "        return;",
            "      case 1:",
            "        return;",
            "    }",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java", //
            "class Test {",
            "  void f(int i) {",
            "    switch (i) {",
            "      case 1:",
            "        return;",
            "      case 0:",
            "      default:",
            "        return;",
            "    }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void refactoring_case() {
    testHelper
        .addInputLines(
            "in/Test.java", //
            "class Test {",
            "  void f(int i) {",
            "    switch (i) {",
            "      case 2:",
            "        return;",
            "      case 1:",
            "      case 0:",
            "      default:",
            "        return;",
            "    }",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java", //
            "class Test {",
            "  void f(int i) {",
            "    switch (i) {",
            "      case 2:",
            "        return;",
            "      case 1:",
            "      case 0:",
            "      default:",
            "        return;",
            "    }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void refactoring_group() {
    testHelper
        .addInputLines(
            "in/Test.java", //
            "class Test {",
            "  void f(int i) {",
            "    switch (i) {",
            "      case 0:",
            "      default:",
            "        return;",
            "      case 1:",
            "        return;",
            "    }",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java", //
            "class Test {",
            "  void f(int i) {",
            "    switch (i) {",
            "      case 1:",
            "        return;",
            "      case 0:",
            "      default:",
            "        return;",
            "    }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void refactoring_fallthrough() {
    testHelper
        .addInputLines(
            "in/Test.java", //
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      default:",
            "        return false;",
            "      case 0:",
            "      case 1:",
            "        System.err.println();",
            "    }",
            "    return true;",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java", //
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 0:",
            "      case 1:",
            "        System.err.println();",
            "        break;",
            "      default:",
            "        return false;",
            "    }",
            "    return true;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void refactoring_fallthroughEmpty() {
    testHelper
        .addInputLines(
            "in/Test.java", //
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      default:",
            "        return false;",
            "      case 0:",
            "      case 1:",
            "    }",
            "    return true;",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java", //
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 0:",
            "      case 1:",
            "        break;",
            "      default:",
            "        return false;",
            "    }",
            "    return true;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void refactoring_outOfOrder() {
    testHelper
        .addInputLines(
            "in/Test.java", //
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 0:",
            "        return true;",
            "      default: // fall through",
            "      case 1: // fall through",
            "    }",
            "    return false;",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java", //
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 0:",
            "        return true;",
            "      case 1: // fall through",
            "      default: // fall through",
            "    }",
            "    return false;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void newNotation_validDefault() {
    assumeTrue(RuntimeVersion.isAtLeast14());
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  public static void nothing1() { }",
            "  public static void nothing2() { }",
            "  public static void nothing3() { }",
            "  public static void switchDefaultCrash(int i)",
            "  {",
            "        switch(i) {",
            "            case 0 -> nothing1();",
            "            case 1 -> nothing2();",
            "            default -> nothing3();",
            "        }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void newNotation_changeOrder() {
    assumeTrue(RuntimeVersion.isAtLeast14());
    testHelper
        .addInputLines(
            "Test.java",
            "class Test {",
            "  public static void nothing1() { }",
            "  public static void nothing2() { }",
            "  public static void nothing3() { }",
            "  public static void switchDefaultCrash(int i)",
            "  {",
            "        switch(i) {",
            "            default -> nothing3();",
            "            case 0 -> nothing1();",
            "            case 1 -> nothing2();",
            "        }",
            "  }",
            "}")
        .addOutputLines(
            "Test.java",
            "class Test {",
            "  public static void nothing1() { }",
            "  public static void nothing2() { }",
            "  public static void nothing3() { }",
            "  public static void switchDefaultCrash(int i)",
            "  {",
            "        switch(i) {",
            "            case 0 -> nothing1();",
            "            case 1 -> nothing2();",
            "            default -> nothing3();",
            "        }",
            "  }",
            "}")
        .doTest();
  }
}