caliper/src/test/java/com/google/caliper/runner/ResultProcessorCreatorTest.java

/*
 * Copyright (C) 2015 Google Inc.
 *
 * 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.caliper.runner;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import com.google.caliper.api.ResultProcessor;
import com.google.caliper.model.Trial;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.IOException;

/**
 * Unit test to ensure that {@link ResultProcessorCreator} works properly.
 */
@RunWith(JUnit4.class)
public class ResultProcessorCreatorTest {

  public static final String NOT_SUPPORTED =
      "ResultProcessor %s not supported as it does not have a public default constructor";

  @Test
  public void testNotPublicConstructor() {
    try {
      ResultProcessorCreator.createResultProcessor(NoPublicConstructorResultProcessor.class);
      fail("Did not fail on non-public constructor");
    } catch (UserCodeException e) {
      assertEquals(String.format(NOT_SUPPORTED, NoPublicConstructorResultProcessor.class),
          e.getMessage());
    }
  }

  public static class NoPublicConstructorResultProcessor implements ResultProcessor {

    NoPublicConstructorResultProcessor() {
    }

    @Override
    public void processTrial(Trial trial) {
    }

    @Override
    public void close() throws IOException {
    }
  }

  @Test
  public void testPublicButNotDefaultConstructor() {
    try {
      ResultProcessorCreator.createResultProcessor(
          PublicButNotDefaultDefaultConstructorResultProcessor.class);
      fail("Did not fail on public but not default constructor");
    } catch (UserCodeException e) {
      assertEquals(
          String.format(NOT_SUPPORTED, PublicButNotDefaultDefaultConstructorResultProcessor.class),
          e.getMessage());
    }
  }

  public static class PublicButNotDefaultDefaultConstructorResultProcessor
      implements ResultProcessor {

    public PublicButNotDefaultDefaultConstructorResultProcessor(
        @SuppressWarnings("UnusedParameters") int i) {
    }

    @Override
    public void processTrial(Trial trial) {
    }

    @Override
    public void close() throws IOException {
    }
  }

  @Test
  public void testPublicConstructor() {
    ResultProcessor processor =
        ResultProcessorCreator.createResultProcessor(PublicDefaultConstructorResultProcessor.class);
    assertTrue(processor instanceof PublicDefaultConstructorResultProcessor);
  }

  public static class PublicDefaultConstructorResultProcessor implements ResultProcessor {

    @Override
    public void processTrial(Trial trial) {
    }

    @Override
    public void close() throws IOException {
    }
  }
}