/*
 * 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.
 *
 * Copyright 2012-2018 the original author or authors.
 */
package org.assertj.core.api.map;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.data.MapEntry.entry;
import static org.assertj.core.test.ExpectedException.none;
import static org.assertj.core.test.Maps.mapOf;

import java.util.Map;

import org.assertj.core.test.ExpectedException;
import org.junit.Rule;
import org.junit.Test;

public class MapAssert_size_Test {

  @Rule
  public ExpectedException thrown = none();

  @Test
  @SuppressWarnings("unchecked")
  public void should_be_able_to_use_integer_assertions_on_size_the_map_size() {
    Map<String, String> stringToString = mapOf(entry("a", "1"), entry("b", "2"));
    // @format:off
    assertThat(stringToString).size().isGreaterThan(0)
                                     .isLessThanOrEqualTo(3)
                              .returnToMap().contains(entry("a", "1"));
    // @format:on
  }

  @Test
  public void should_have_an_helpful_error_message_when_size_is_used_on_a_null_map() {
    Map<String, String> nullMap = null;
    thrown.expectNullPointerException("Can not perform assertions on the size of a null map.");
    assertThat(nullMap).size().isGreaterThan(1);
  }
}
