MissingDefaultTest.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 com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode.TEXT_MATCH;
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 MissingDefault}Test */
@RunWith(JUnit4.class)
public class MissingDefaultTest {

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

  @Test
  public void positive() {
    BugCheckerRefactoringTestHelper.newInstance(MissingDefault.class, getClass())
        .addInputLines(
            "in/Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 42:",
            "        return true;",
            "    }",
            "    return false;",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 42:",
            "        return true;",
            "      default: // fall out",
            "    }",
            "    return false;",
            "  }",
            "}")
        .doTest(TEXT_MATCH);
  }

  @Test
  public void positiveBreak() {
    BugCheckerRefactoringTestHelper.newInstance(MissingDefault.class, getClass())
        .addInputLines(
            "in/Test.java",
            "class Test {",
            "  void f(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 42:",
            "        System.err.println(42);",
            "    }",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java",
            "class Test {",
            "  void f(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 42:",
            "        System.err.println(42);",
            "        break;",
            "      default: // fall out",
            "    }",
            "  }",
            "}")
        .doTest(TEXT_MATCH);
  }

  @Test
  public void negative() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 42:",
            "        return true;",
            "      default:",
            "        return false;",
            "    }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void enumSwitch() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  enum E { ONE, TWO }",
            "  boolean f(E e) {",
            "    switch (e) {",
            "      case ONE:",
            "        return true;",
            "    }",
            "    return false;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void empty() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 42:",
            "        return true;",
            "      default: // fall out",
            "    }",
            "    return false;",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void emptyNoComment() {
    BugCheckerRefactoringTestHelper.newInstance(MissingDefault.class, getClass())
        .addInputLines(
            "in/Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 42:",
            "        return true;",
            "      default:",
            "    }",
            "    return false;",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      case 42:",
            "        return true;",
            "      default: // fall out",
            "    }",
            "    return false;",
            "  }",
            "}")
        .doTest(TEXT_MATCH);
  }

  @Test
  public void interiorEmptyNoComment() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    switch (i) {",
            "      default:",
            "      case 42:",
            "        return true;",
            "    }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void multipleStatementsInGroup() {
    BugCheckerRefactoringTestHelper.newInstance(MissingDefault.class, getClass())
        .addInputLines(
            "in/Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 42:",
            "        System.err.println();",
            "        return true;",
            "    }",
            "    return false;",
            "  }",
            "}")
        .addOutputLines(
            "out/Test.java",
            "class Test {",
            "  boolean f(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 42:",
            "        System.err.println();",
            "        return true;",
            "      default: // fall out",
            "    }",
            "    return false;",
            "  }",
            "}")
        .doTest(TEXT_MATCH);
  }

  @Test
  public void arrowSwitch() {
    assumeTrue(RuntimeVersion.isAtLeast14());
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  void m(int i) {",
            "    // BUG: Diagnostic contains:",
            "    switch (i) {",
            "      case 1 -> {}",
            "      case 2 -> {}",
            "    }",
            "  }",
            "}")
        .doTest();
  }

  @Test
  public void arrowSwitchNegative() {
    assumeTrue(RuntimeVersion.isAtLeast14());
    compilationHelper
        .addSourceLines(
            "Test.java",
            "class Test {",
            "  void m(int i) {",
            "    switch (i) {",
            "      case 1 -> {}",
            "      case 2 -> {}",
            "      default -> {} // fall out",
            "    }",
            "  }",
            "}")
        .doTest();
  }
}