test/com/facebook/buck/util/OptionalsTest.java

/*
 * Copyright 2012-present Facebook, 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.facebook.buck.util;

import static org.junit.Assert.assertEquals;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableSet;

import org.junit.Test;

/**
 * Unit test for {@link Optionals}.
 */
public class OptionalsTest {

  @Test
  public void testAbsentItemNotAdded() {
    Optional<String> absent = Optional.absent();
    ImmutableSet.Builder<String> builder = ImmutableSet.builder();

    Optionals.addIfPresent(absent, builder);

    assertEquals(ImmutableSet.<String>of(), builder.build());
  }

  @Test
  public void testPresentItemAdded() {
    Optional<String> absent = Optional.of("Hello");
    ImmutableSet.Builder<String> builder = ImmutableSet.builder();

    Optionals.addIfPresent(absent, builder);

    assertEquals(ImmutableSet.of("Hello"), builder.build());
  }
}