Added basic testing

Started doing all comparisons in Runes
string cound emojis as 4 runes instead of just the 1 it is

config.go

@@ -54,18 +54,18 @@ func NewTinDConfig() *Config {
 //
 // This does slow down initialization, but the final product still runs fast to
 // generate ids
-func (c *Config) WithRuneset(r string) *Config {
+func (c *Config) WithRuneset(r []rune) *Config {
 	c.runes = ensureUniqueRunes(r)
 	c.runesize = len(c.runes)
 	c.mod = byte(c.runesize - 1)
 	return c
 }
 
-func ensureUniqueRunes(r string) []rune {
+func ensureUniqueRunes(r []rune) []rune {
 	unq := make(map[rune]int)
 	var index int
 	// loop through the runes to find duplicates
-	for _, v := range []rune(r) {
+	for _, v := range r {
 		// if the current rune hasn't been seen yet, assign it
 		if _, ok := unq[v]; !ok {
 			unq[v] = index
@@ -97,17 +97,21 @@ func (c *Config) Zero() TinD {
 
 // Gen generates a TinD with the given configuration
 func (c *Config) Gen() TinD {
-	t := TinD{
-		bytes:  make([]byte, c.size),
-		config: c,
-	}
-	_, err := rand.Read(t.bytes)
+	bytes := make([]byte, c.size)
+	runes := make([]rune, c.size)
+	_, err := rand.Read(bytes)
 	if err != nil {
 		log.Fatalln(err)
 	}
 	// Make sure each byte fits the rune so it can be encoded and decoded
 	for i := 0; i < c.size; i++ {
-		t.bytes[i] = t.bytes[i] & c.mod
+		bytes[i] = bytes[i] & c.mod
+		runes[i] = c.runes[bytes[i]]
+	}
+	t := TinD{
+		bytes:  bytes,
+		runes: runes,
+		config: c,
 	}
 	return t
 }
@@ -119,12 +123,15 @@ func (c *Config) FromString(in string) (TinD, error) {
 	if len(in) != c.size {
 		return c.Zero(), errors.New("given id isn't the same size as the configuration")
 	}
-	t := make([]byte, c.size)
+	t := TinD{
+		bytes: make([]byte, c.size),
+		config: c,
+	}
 	r := []rune(in)
-	for i := 0; i < l; i++ {
+	for i := 0; i < c.size; i++ {
 		for j := 0; j < c.runesize; j++ {
-			if r[i] == alphabet[j] {
-				t[i] = byte(j)
+			if r[i] == c.runes[j] {
+				t.bytes[i] = byte(j)
 				break
 			}
 		}

tind.go

@@ -10,11 +10,6 @@ package tind
 // TinD is at it's core a byte slice. It's default alphabet can be replaced with
 // whatever unicode characters you want, as the alphabet it uses is just a slice
 // of runes
-import (
-	"crypto/rand"
-	"errors"
-	"log"
-)
 
 // defaults are just a call to NewConfig()
 var defaults = NewTinDConfig()
@@ -24,9 +19,9 @@ var defaults = NewTinDConfig()
 // Each byte can be the value 0 -> len(alphabet) that is used, to ensure
 // values can be encoded and decoded reliably. The longer the alphabet
 // used, the more randomness can be done.
-type TinD struct{
-	bytes []byte
-	str string
+type TinD struct {
+	bytes  []byte
+	runes  []rune
 	config *Config
 }
 
@@ -37,11 +32,12 @@ func Gen() TinD {
 
 // String returns the Human Readable form of the TinD
 func (t TinD) String() string {
-	if len(t.str) == t.config.size {
-		return t.str
-	}
-	t.str = makeString(t.bytes, t.config.size, t.config.runset)
-	return t.str
+	return string(t.runes)
+}
+
+// Runes returns the Rune array of the TinD
+func (t TinD) Runes() []rune {
+	return t.runes
 }
 
 // Bytes returns the raw bytes of the TinD
@@ -49,10 +45,3 @@ func (t TinD) Bytes() []byte {
 	return t.bytes
 }
 
-func makeString(bytes []byte, size int, runeset []rune) string {
-	r := make([]rune, size)
-	for i := 0; i < size; i++ {
-		r[i] = runeset[bytes[i]]
-	}
-	return string(r)
-}

tind_test.go

@@ -0,0 +1,78 @@
+package tind
+
+import (
+	"log"
+	"testing"
+	"time"
+)
+
+func Test_GenTinD_With_Defaults(t *testing.T) {
+	id := Gen()
+	if len(id.String()) != 4 {
+		t.Errorf("expecting 4 bytes, got %d", len(id.String()))
+	}
+}
+
+func Test_GenTinD_With_VaryingSizes(t *testing.T) {
+	tests := []struct {
+		size             int
+		runes            []rune
+		expectedRuneSize int
+	}{
+		{
+			size:             4,
+			runes:            []rune("abcdefghijklmnopqrstuvwxyz"),
+			expectedRuneSize: 26,
+		}, {
+			size:             8,
+			runes:            []rune("HGHHGHGJJHSHGABBJEBJBE"),
+			expectedRuneSize: 7,
+		}, {
+			size:             8,
+			runes:            []rune("😀😡🤕🎃🤚🫲🙀😭"),
+			expectedRuneSize: 8,
+		},
+	}
+	for _, v := range tests {
+		tt := NewTinDConfig().WithRuneset(v.runes).WithSize(v.size).Gen()
+		if len(tt.Runes()) != v.size {
+			t.Errorf("config set size to %d, but generated an id of size %d. id: %s", v.size, len([]rune(tt.String())), tt.String())
+		}
+		if tt.config.runesize != v.expectedRuneSize {
+			t.Errorf("expected runsize of %d, got runesize of %d", len(v.runes), tt.config.runesize)
+		}
+	}
+}
+
+//func Test_Generate_With_Collisions(t *testing.T) {
+//	log.Println("Test TinD for collisions, base on number of iterations and time")
+//
+//	maxSize := 16
+//	for size := 4; size < maxSize; size++ {
+//		CheckCollisions(size)
+//	}
+//}
+
+func CheckCollisions(tindSize int) {
+	ids := make(map[string]struct{})
+	collided := false
+	tc := NewTinDConfig().WithSize(tindSize)
+	var iters uint64
+	start := time.Now()
+
+	log.Printf("Starting check with size %d", tindSize)
+	for !collided {
+		iters++
+		nt := tc.Gen()
+		if _, ok := ids[nt.String()]; ok {
+			collided = true
+		} else {
+			ids[nt.String()] = struct{}{}
+		}
+		// Print a message every 2000000 iterations saying we are still working
+		if iters%2000000 == 0 {
+			log.Printf("Still no collions on size %d after %d iterations", tindSize, iters)
+		}
+	}
+	log.Printf("Collision found after %v and %d iterations with size of %d", time.Since(start), iters, tindSize)
+}