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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package iterable
import (
"iterable";
"testing";
)
type IntArray []int;
func (arr IntArray) Iter() <-chan interface {} {
ch := make(chan interface {});
go func() {
for i, x := range arr {
ch <- x
}
close(ch)
}();
return ch
}
var oneToFive IntArray = []int{ 1, 2, 3, 4, 5 };
func isNegative(n interface {}) bool {
return n.(int) < 0
}
func isPositive(n interface {}) bool {
return n.(int) > 0
}
func isAbove3(n interface {}) bool {
return n.(int) > 3
}
func isEven(n interface {}) bool {
return n.(int) % 2 == 0
}
func doubler(n interface {}) interface {} {
return n.(int) * 2
}
func addOne(n interface {}) interface {} {
return n.(int) + 1
}
// A stream of the natural numbers: 0, 1, 2, 3, ...
type integerStream struct {}
func (i integerStream) Iter() <-chan interface {} {
ch := make(chan interface {});
go func() {
for i := 0; ; i++ {
ch <- i
}
}();
return ch
}
func TestAll(t *testing.T) {
if !All(oneToFive, isPositive) {
t.Error("All(oneToFive, isPositive) == false")
}
if All(oneToFive, isAbove3) {
t.Error("All(oneToFive, isAbove3) == true")
}
}
func TestAny(t *testing.T) {
if Any(oneToFive, isNegative) {
t.Error("Any(oneToFive, isNegative) == true")
}
if !Any(oneToFive, isEven) {
t.Error("Any(oneToFive, isEven) == false")
}
}
func assertArraysAreEqual(t *testing.T, res []interface {}, expected []int) {
if len(res) != len(expected) {
t.Errorf("len(res) = %v, want %v", len(res), len(expected));
goto missing
}
for i := range res {
if v := res[i].(int); v != expected[i] {
t.Errorf("res[%v] = %v, want %v", i, v, expected[i]);
goto missing
}
}
return;
missing:
t.Errorf("res = %v\nwant %v", res, expected);
}
func TestFilter(t *testing.T) {
ints := integerStream{};
moreInts := Filter(ints, isAbove3).Iter();
res := make([]interface {}, 3);
for i := 0; i < 3; i++ {
res[i] = <-moreInts;
}
assertArraysAreEqual(t, res, []int{ 4, 5, 6 })
}
func TestFind(t *testing.T) {
ints := integerStream{};
first := Find(ints, isAbove3);
if first.(int) != 4 {
t.Errorf("Find(ints, isAbove3) = %v, want 4", first)
}
}
func TestMap(t *testing.T) {
res := Data(Map(Map(oneToFive, doubler), addOne));
assertArraysAreEqual(t, res, []int{ 3, 5, 7, 9, 11 })
}
func TestPartition(t *testing.T) {
ti, fi := Partition(oneToFive, isEven);
assertArraysAreEqual(t, Data(ti), []int{ 2, 4 });
assertArraysAreEqual(t, Data(fi), []int{ 1, 3, 5 })
}
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