mirror of
https://github.com/golang/go
synced 2024-11-22 21:20:03 -07:00
130 lines
2.8 KiB
Go
130 lines
2.8 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package iterable
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import (
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"iterable";
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"testing";
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)
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type IntArray []int;
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func (arr IntArray) Iter() <-chan interface {} {
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ch := make(chan interface {});
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go func() {
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for i, x := range arr {
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ch <- x
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}
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close(ch)
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}();
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return ch
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}
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var oneToFive = IntArray{ 1, 2, 3, 4, 5 };
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func isNegative(n interface {}) bool {
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return n.(int) < 0
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}
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func isPositive(n interface {}) bool {
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return n.(int) > 0
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}
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func isAbove3(n interface {}) bool {
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return n.(int) > 3
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}
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func isEven(n interface {}) bool {
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return n.(int) % 2 == 0
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}
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func doubler(n interface {}) interface {} {
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return n.(int) * 2
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}
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func addOne(n interface {}) interface {} {
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return n.(int) + 1
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}
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func adder(acc interface {}, n interface {}) interface {} {
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return acc.(int) + n.(int)
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}
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// A stream of the natural numbers: 0, 1, 2, 3, ...
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type integerStream struct {}
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func (i integerStream) Iter() <-chan interface {} {
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ch := make(chan interface {});
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go func() {
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for i := 0; ; i++ {
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ch <- i
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}
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}();
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return ch
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}
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func TestAll(t *testing.T) {
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if !All(oneToFive, isPositive) {
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t.Error("All(oneToFive, isPositive) == false")
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}
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if All(oneToFive, isAbove3) {
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t.Error("All(oneToFive, isAbove3) == true")
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}
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}
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func TestAny(t *testing.T) {
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if Any(oneToFive, isNegative) {
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t.Error("Any(oneToFive, isNegative) == true")
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}
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if !Any(oneToFive, isEven) {
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t.Error("Any(oneToFive, isEven) == false")
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}
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}
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func assertArraysAreEqual(t *testing.T, res []interface {}, expected []int) {
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if len(res) != len(expected) {
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t.Errorf("len(res) = %v, want %v", len(res), len(expected));
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goto missing
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}
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for i := range res {
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if v := res[i].(int); v != expected[i] {
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t.Errorf("res[%v] = %v, want %v", i, v, expected[i]);
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goto missing
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}
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}
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return;
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missing:
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t.Errorf("res = %v\nwant %v", res, expected);
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}
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func TestFilter(t *testing.T) {
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ints := integerStream{};
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moreInts := Filter(ints, isAbove3).Iter();
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res := make([]interface {}, 3);
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for i := 0; i < 3; i++ {
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res[i] = <-moreInts;
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}
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assertArraysAreEqual(t, res, []int{ 4, 5, 6 })
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}
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func TestFind(t *testing.T) {
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ints := integerStream{};
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first := Find(ints, isAbove3);
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if first.(int) != 4 {
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t.Errorf("Find(ints, isAbove3) = %v, want 4", first)
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}
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}
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func TestInject(t *testing.T) {
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res := Inject(oneToFive, 0, adder);
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if res.(int) != 15 {
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t.Errorf("Inject(oneToFive, 0, adder) = %v, want 15", res)
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}
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}
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func TestMap(t *testing.T) {
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res := Data(Map(Map(oneToFive, doubler), addOne));
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assertArraysAreEqual(t, res, []int{ 3, 5, 7, 9, 11 })
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}
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func TestPartition(t *testing.T) {
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ti, fi := Partition(oneToFive, isEven);
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assertArraysAreEqual(t, Data(ti), []int{ 2, 4 });
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assertArraysAreEqual(t, Data(fi), []int{ 1, 3, 5 })
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}
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