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package main
import "reflect"
import "testing"
func TestSum(test *testing.T) {
test.Run("collection of 5 numbers", func(test *testing.T) {
numbers := []int{1, 2, 3, 4, 5}
got := Sum(numbers)
want := 15
if got != want {
test.Errorf("got %d want %d given, %v", got, want, numbers)
}
})
test.Run("collection of any size", func(test *testing.T) {
numbers := []int{1, 2, 3}
got := Sum(numbers)
want := 6
if got != want {
test.Errorf("got %d want %d given, %v", got, want, numbers)
}
})
}
func TestSumAll(t *testing.T) {
got := SumAll([]int{1, 2}, []int{0, 9})
want := []int{3, 9}
if !reflect.DeepEqual(got, want) {
t.Errorf("got %v want %v", got, want)
}
}
func TestSumAllTails(t *testing.T) {
checkSums := func(t *testing.T, got, want []int) {
t.Helper()
if !reflect.DeepEqual(got, want) {
t.Errorf("got %v want %v", got, want)
}
}
t.Run("make the sums of some slices", func(t *testing.T) {
got := SumAllTails([]int{1, 2}, []int{0, 9})
want := []int{2, 9}
checkSums(t, got, want)
})
t.Run("safely sum empty slices", func(t *testing.T) {
got := SumAllTails([]int{}, []int{3, 4, 5})
want := []int{0, 9}
checkSums(t, got, want)
})
}
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