// =================================================================================================
// Copyright 2011 Twitter, Inc.
// -------------------------------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this work except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file, or 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.twitter.common.util;
import org.easymock.IMocksControl;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import static org.easymock.EasyMock.*;
import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.*;
/**
* @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);
}
}