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import com.google.common.collect.Streams;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import java.util.*;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;
public class GauavaStreamsTests {
List<Integer> numbers;
@Before
public void setUp() {
numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20);
}
@Test
public void createStreamsWithCollection() {
//Deprecated API to create stream from collection
Stream streamFromCollection = Streams.stream(numbers);
//Assert.assertNotNull(streamFromCollection);
StreamUtility.assertStreamEquals(streamFromCollection, numbers.stream());
}
@Test
public void createStreamsWithIterable() {
Iterable<Integer> numbersIterable = (Iterable<Integer>) numbers;
Stream streamFromIterable = Streams.stream(numbersIterable);
Assert.assertNotNull(streamFromIterable);
StreamUtility.assertStreamEquals(streamFromIterable, numbers.stream());
}
@Test
public void createStreamsWithIterator() {
Iterator<Integer> numbersIterator = numbers.iterator();
Stream streamFromIterator = Streams.stream(numbersIterator);
Assert.assertNotNull(streamFromIterator);
StreamUtility.assertStreamEquals(streamFromIterator, numbers.stream());
}
@Test
public void createStreamsWithOptional() {
Stream streamFromOptional = Streams.stream(Optional.of(1));
Assert.assertNotNull(streamFromOptional);
Assert.assertEquals(streamFromOptional.count(), 1);
}
@Test
public void createStreamsWithOptionalLong() {
LongStream streamFromOptionalLong = Streams.stream(OptionalLong.of(1));
Assert.assertNotNull(streamFromOptionalLong);
Assert.assertEquals(streamFromOptionalLong.count(), 1);
}
@Test
public void createStreamsWithOptionalInt() {
IntStream streamFromOptionalInt = Streams.stream(OptionalInt.of(1));
//Assert.assertNotNull(streamFromOptionalInt);
Assert.assertEquals(streamFromOptionalInt.count(), 1);
}
@Test
public void createStreamsWithOptionalDouble() {
DoubleStream streamFromOptionalDouble = Streams.stream(OptionalDouble.of(1.0));
//Assert.assertNotNull(streamFromOptionalDouble);
Assert.assertEquals(streamFromOptionalDouble.count(), 1);
}
@Test
public void concatStreamsOfSameType() {
Stream oddNumbers = Arrays
.asList(1, 3, 5, 7, 9, 11, 13, 15, 17, 19)
.stream();
Stream evenNumbers = Arrays
.asList(2, 4, 6, 8, 10, 12, 14, 16, 18, 20)
.stream();
Stream combinedStreams = Streams.concat(oddNumbers, evenNumbers);
//Assert.assertNotNull(combinedStreams);
StreamUtility.assertStreamEquals(combinedStreams, Stream.concat(oddNumbers, evenNumbers));
}
@Test
public void concatStreamsOfTypeLongStream() {
LongStream firstTwenty = LongStream.range(1, 20);
LongStream nextTwenty = LongStream.range(21, 40);
LongStream combinedStreams = Streams.concat(firstTwenty, nextTwenty);
Assert.assertNotNull(combinedStreams);
StreamUtility.assertStreamEquals(combinedStreams, LongStream.concat(firstTwenty, nextTwenty));
}
@Test
public void concatStreamsOfTypeIntStream() {
IntStream firstTwenty = IntStream.range(1, 20);
IntStream nextTwenty = IntStream.range(21, 40);
IntStream combinedStreams = Streams.concat(firstTwenty, nextTwenty);
Assert.assertNotNull(combinedStreams);
StreamUtility.assertStreamEquals(combinedStreams, IntStream.concat(firstTwenty, nextTwenty));
}
@Test
public void findLastOfStream() {
Optional<Integer> lastElement = Streams.findLast(numbers.stream());
Assert.assertNotNull(lastElement.get());
Assert.assertEquals(lastElement.get(), numbers.get(20));
}
@Test
public void mapWithIndexTest() {
Stream stringSream = Stream.of("a", "b", "c");
Stream<String> mappedStream = Streams.mapWithIndex(stringSream, (str, index) -> str + ":" + index);
//Assert.assertNotNull(mappedStream);
Assert.assertEquals(mappedStream
.findFirst()
.get(), "a:0");
}
@Test
public void streamsZipTest() {
Stream stringSream = Stream.of("a", "b", "c");
Stream intStream = Stream.of(1, 2, 3);
Stream<String> mappedStream = Streams.zip(stringSream, intStream, (str, index) -> str + ":" + index);
//Assert.assertNotNull(mappedStream);
Assert.assertEquals(mappedStream
.findFirst()
.get(), "a:1");
}
}