src/test/java/com/android/tools/r8/ir/optimize/switches/SwitchCaseSubsumptionTest.java

// Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.ir.optimize.switches;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class SwitchCaseSubsumptionTest extends TestBase {

  private final TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withAllRuntimes().build();
  }

  public SwitchCaseSubsumptionTest(TestParameters parameters) {
    this.parameters = parameters;
  }

  @Test
  public void test() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(SwitchCaseSubsumptionTest.class)
        .addKeepMainRule(TestClass.class)
        .setMinApi(parameters.getRuntime())
        .compile()
        .run(parameters.getRuntime(), TestClass.class)
        .assertSuccessWithOutputLines("Hello world!");
  }

  static class TestClass {

    public static void main(String[] args) {
      System.out.print(test(0, "Hello", null));
      System.out.print(test(1, null, " world!"));
      System.out.println();
    }

    static String test(int which, String a, String b) {
      String result = a;
      switch (which) {
        case 0:
          result = a;
          break;
        case 1:
          result = b;
          break;
      }
      return result;
    }
  }
}