Testing: add entropy test for the giggles

entropy_test.go

@@ -0,0 +1,69 @@
+package common
+
+import (
+	"strings"
+	"testing"
+)
+
+func Test_RNG(t *testing.T) {
+	for n := 0; n != 500; n++ {
+		zero := RNG(55555)
+		one := RNG(55555)
+		t.Logf("Random0: %d Random1: %d", zero, one)
+		if zero == one {
+			t.Fatal("RNG hit a duplicate")
+		}
+		zero = 0
+		one = 0
+	}
+
+}
+
+func randStrChecks(zero, one string, t *testing.T) {
+	if len(zero) != len(one) {
+		t.Fatalf("RandStr output length inconsistency, len(zero) is %d but wanted len(one) which is %d", len(zero), len(one))
+	}
+	if len(zero) != 55 || len(one) != 55 {
+		t.Fatalf("RandStr output length inconsistency, len(zero) is %d and len(one) is %d, but both should have been 55", len(zero), len(one))
+	}
+	if zero == one {
+		t.Fatalf("RandStr hit a duplicate, %s == %s", zero, one)
+	}
+}
+
+func Test_RandStr(t *testing.T) {
+	for n := 0; n != 500; n++ {
+		zero := RandStr(55)
+		one := RandStr(55)
+		t.Logf("Random0: %s Random1: %s", zero, one)
+		randStrChecks(zero, one, t)
+		zero = ""
+		one = ""
+	}
+
+}
+
+func Test_RandStr_Entropy(t *testing.T) {
+	for n := 0; n != 500; n++ {
+		zero := RandStr(55)
+		one := RandStr(55)
+		randStrChecks(zero, one, t)
+		zeroSplit := strings.Split(zero, "")
+		oneSplit := strings.Split(one, "")
+		var similarity = 0
+		for i, char := range zeroSplit {
+			if oneSplit[i] != char {
+				continue
+			}
+			similarity++
+			t.Logf("[-] zeroSplit[%d] is the same as oneSplit[%d] (%s)", i, i, char)
+		}
+		if similarity*4 > 55 {
+			t.Errorf("[ENTROPY FAILURE] more than a quarter of the string is the same!\n zero: %s \n one: %s \nTotal similar: %d", zero, one, similarity)
+		}
+		t.Logf("[ENTROPY] Similarity score (lower is better): %d", similarity)
+		zero = ""
+		one = ""
+	}
+
+}