init

internal/utils/randomizer/rand.go

@@ -0,0 +1,45 @@
+package randomizer
+
+import (
+	"fmt"
+	"math/rand"
+)
+
+type Random interface {
+	Int() int
+}
+
+func init() {}
+
+type rndGenerator func(n int) int
+
+type Randomizer struct {
+	fn rndGenerator
+}
+
+func NewRandomizer(fn rndGenerator) *Randomizer {
+	return &Randomizer{fn: fn}
+}
+
+func (r *Randomizer) Int(n int) int {
+	return r.fn(n)
+}
+
+func Rand(rand int) int {
+	return randGen(rand)
+}
+func realRand(n int) int { return int(rand.Intn(n)) }
+func fakeRand(n int) func(numb int) int {
+	return func(numb int) int {
+		if n >= numb {
+			panic(fmt.Sprintf("%d Should not be superior of %d", n, numb))
+		}
+		return n
+	}
+}
+
+var randGen = NewRandomizer(realRand).Int
+
+func FakeRandomizer(n int) {
+	randGen = NewRandomizer(fakeRand(n)).Int
+}