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pipe_test.go
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pipe_test.go
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package piper
import "testing"
func TestPipeAggregation(t *testing.T) {
var results []int
items := []int{1, 2, 3, 4}
FromMany(items).
Aggregate(0, func(total, n int) int { return total + n }).
To(func(n int) { results = append(results, n) })
if count := len(results); count != 1 {
t.Fatalf("Expected 1 element but got %d", count)
}
if results[0] != 10 {
t.Errorf("Expected value 10 but got %v", results[0])
}
}
func TestPipeCreationUsingCustomFunction(t *testing.T) {
var results []int
From(countDown(3)).To(func(n int) { results = append(results, n) })
if count := len(results); count != 4 {
t.Fatalf("Expected 4 elements but got %d", count)
}
if results[0] != 3 {
t.Errorf("Expected element 3 but got %v", results[0])
}
if results[1] != 2 {
t.Errorf("Expected element 2 but got %v", results[1])
}
if results[2] != 1 {
t.Errorf("Expected element 1 but got %v", results[2])
}
if results[3] != 0 {
t.Errorf("Expected element 0 but got %v", results[3])
}
}
func TestPipeCreationUsingCustomFunctionWithNoResults(t *testing.T) {
var results []int
From(countDown(-1)).To(func(n int) { results = append(results, n) })
if count := len(results); count != 0 {
t.Fatalf("Expected no elements but got %d", count)
}
}
func TestPipeDraining(t *testing.T) {
var results []string
FromMany([]string{"a", "b", "c"}).
To(func(v string) { results = append(results, v) })
if count := len(results); count != 3 {
t.Fatalf("Expected 3 elements but got %d", count)
}
if results[0] != "a" {
t.Errorf("Expected element 'a' but got %v", results[0])
}
if results[1] != "b" {
t.Errorf("Expected element 'b' but got %v", results[1])
}
if results[2] != "c" {
t.Errorf("Expected element 'c' but got %v", results[2])
}
}
func TestPipeDrainingWithFiltering(t *testing.T) {
var results []string
FromMany([]string{"a", "b", "c"}).
Where(func(v string) bool { return v != "b" }).
To(func(v string) { results = append(results, v) })
if count := len(results); count != 2 {
t.Fatalf("Expected 2 elements but got %d", count)
}
if results[0] != "a" {
t.Errorf("Expected element 'a' but got %v", results[0])
}
if results[1] != "c" {
t.Errorf("Expected element 'c' but got %v", results[1])
}
}
func TestPipeDrainingWithFlattening(t *testing.T) {
var results []string
FromSingle([]string{"blue", "red", "green"}, []string{"square", "circle", "triangle"}).
Flatten().
To(func(color, shape string) { results = append(results, color+" "+shape) })
if count := len(results); count != 9 {
t.Fatalf("Expected 9 elements but got %d", count)
}
if expected := "blue square"; results[0] != expected {
t.Errorf("Expected %v but got %v", expected, results[0])
}
if expected := "blue circle"; results[1] != expected {
t.Errorf("Expected %v but got %v", expected, results[1])
}
if expected := "blue triangle"; results[2] != expected {
t.Errorf("Expected %v but got %v", expected, results[2])
}
if expected := "red square"; results[3] != expected {
t.Errorf("Expected %v but got %v", expected, results[3])
}
if expected := "red circle"; results[4] != expected {
t.Errorf("Expected %v but got %v", expected, results[4])
}
if expected := "red triangle"; results[5] != expected {
t.Errorf("Expected %v but got %v", expected, results[5])
}
if expected := "green square"; results[6] != expected {
t.Errorf("Expected %v but got %v", expected, results[6])
}
if expected := "green circle"; results[7] != expected {
t.Errorf("Expected %v but got %v", expected, results[7])
}
if expected := "green triangle"; results[8] != expected {
t.Errorf("Expected %v but got %v", expected, results[8])
}
}
func TestPipeDrainingWithProjection(t *testing.T) {
var results1 []int
var results2 []int
FromMany([]int{1, 2, 3}).
Select(func(n int) (int, int) { return n, n * 2 }).
To(func(n1, n2 int) { results1 = append(results1, n1); results2 = append(results2, n2) })
if count := len(results1); count != 3 {
t.Fatalf("Expected 3 elements but got %d", count)
}
if results1[0] != 1 {
t.Errorf("Expected element 1 but got %v", results1[0])
}
if results1[1] != 2 {
t.Errorf("Expected element 2 but got %v", results1[1])
}
if results1[2] != 3 {
t.Errorf("Expected element 3 but got %v", results1[2])
}
if count := len(results2); count != 3 {
t.Fatalf("Expected 3 elements but got %d", count)
}
if results2[0] != 2 {
t.Errorf("Expected element 2 but got %v", results2[0])
}
if results2[1] != 4 {
t.Errorf("Expected element 4 but got %v", results2[1])
}
if results2[2] != 6 {
t.Errorf("Expected element 6 but got %v", results2[2])
}
}
type CountDownSource func() (value int, restOrEnd CountDownSource)
func countDown(n int) CountDownSource {
return func() (int, CountDownSource) {
if n < 0 {
return 0, nil
}
return n, countDown(n - 1)
}
}