content: /**
   * 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 org.apache.aurora.common.util;
  
  import org.easymock.IMocksControl;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.easymock.EasyMock.createControl;
  import static org.easymock.EasyMock.expect;
  import static org.hamcrest.CoreMatchers.is;
  import static org.junit.Assert.assertThat;
  
  /**
   * @author William Farner
   */
  public class SamplerTest {
  
    private IMocksControl control;
  
    private Random random;
  
    @Before
    public void setUp() throws Exception {
      control = createControl();
  
      random = control.createMock(Random.class);
    }
  
    @After
    public void verify() {
      control.verify();
    }
  
    @Test
    public void testThresholdWorks() {
      for (int i = 0; i <= 100; i++) {
        expect(random.nextDouble()).andReturn(0.01 * i);
      }
  
      control.replay();
  
      Sampler sampler = new Sampler(25, random);
  
      for (int i = 0; i <= 100; i++) {
        assertThat(sampler.select(), is(i < 25));
      }
    }
  
    @Test(expected = IllegalArgumentException.class)
    public void testRejectsNegativePercent() {
      control.replay();
  
      new Sampler(-10, random);
    }
  }
  