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Merged
jbgi merged 1 commit into from
Jul 29, 2018
Merged

Add Stream tests #341

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75 changes: 69 additions & 6 deletions core/src/test/java/fj/data/StreamTest.java
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Original file line number Diff line number Diff line change
@@ -1,16 +1,16 @@
package fj.data;

import fj.Equal;
import fj.Ord;
import fj.P2;
import fj.control.parallel.Strategy;
import org.junit.Test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.ConcurrentModificationException;

import static fj.data.IOFunctions.stdinReadLine;
import static java.lang.System.out;
import static fj.data.Stream.*;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;

/**
Expand All @@ -21,7 +21,7 @@ public class StreamTest {
@Test
public void infiniteStream() {
Stream<Integer> s = Stream.forever(Enumerator.intEnumerator, 0).bind(Stream::single);
assertEquals(List.range(0, 5), s.take(5).toList());
assertThat(List.range(0, 5), is(s.take(5).toList()));
}

@Test
Expand All @@ -48,5 +48,68 @@ public void iterableStreamWithStructureUpdate() {
x = s2.head();
}

@Test(expected=Error.class)
public void testCycleNil(){
cycle(Stream.nil());
}

@Test
public void testCycle() {
Stream<Character> s = stream(new Character[]{'a', 'b'});
assertThat(cycle(s).take(5),
is(stream(new Character[]{'a', 'b', 'a', 'b', 'a'})));
}

@Test
public void testIterate() {
assertThat(iterate(a -> 2 * a + 1, 1).take(5),
is(stream(new Integer[]{1, 3, 7, 15, 31})));
}

@Test
public void testArrayStreamEmpty() {
assertThat(arrayStream(new Integer[]{}), is(Stream.nil()));
}

@Test(expected=Error.class)
public void testNilHead() {
Stream.nil().head();
}

@Test(expected=Error.class)
public void testNilTail() {
Stream.nil().tail();
}

@Test
public void testArray() {
Character[] a = new Character[]{'a', 'b', 'c'};
Stream<Character> s = stream(a);
assertThat(s.array(Character[].class), is(a));
}

@Test
public void testZipIndex() {
Character[] a = new Character[]{'a', 'b', 'c'};
P2<Stream<Character>, Stream<Integer>> p = unzip(stream(a).zipIndex().drop(1));
assertThat(p._1(), is(stream(new Character[]{'b', 'c'})));
assertThat(p._2(), is(stream(new Integer[]{1, 2})));
}

@Test
public void testMinus() {
Character[] a1 = new Character[]{'a', 'b', 'c', 'd', 'e'};
Stream<Character> s1 = stream(a1);
Character[] a2 = new Character[]{'b', 'e'};
Stream<Character> s2 = stream(a2);
assertThat(s1.minus(Equal.charEqual, s2),
is(stream(new Character[]{'a', 'c', 'd'})));
}

@Test
public void testSort() {
Stream<Integer> s = range(Enumerator.intEnumerator, 99, -99, -1);
assertThat(s.sort(Ord.intOrd, Strategy.seqStrategy()),
is(s.sort(Ord.intOrd)));
}
}