/*
* Copyright 2017 the original author or authors.
*
* 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.springframework.data.mongodb.core.aggregation;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;
import org.bson.Document;
import org.junit.Test;
/**
* Unit tests for {@link SampleOperation}.
*
* @author Gustavo de Geus
*/
public class SampleOperationUnitTests {
private static final String SIZE = "size";
private static final String OP = "$sample";
@Test(expected = IllegalArgumentException.class) // DATAMONGO-1325
public void rejectsNegativeSample() {
new SampleOperation(-1L);
}
@Test(expected = IllegalArgumentException.class) // DATAMONGO-1325
public void rejectsZeroSample() {
new SampleOperation(0L);
}
@Test // DATAMONGO-1325
public void rendersSampleOperation() {
long sampleSize = 5L;
SampleOperation sampleOperation = Aggregation.sample(sampleSize);
Document sampleOperationDocument = sampleOperation.toDocument(Aggregation.DEFAULT_CONTEXT);
assertNotNull(sampleOperationDocument.get(OP));
assertThat(sampleOperationDocument.get(OP), is(instanceOf(Document.class)));
Document sampleSizeDocument = sampleOperationDocument.get(OP, Document.class);
assertEquals(sampleSize, sampleSizeDocument.get(SIZE));
}
}