diff --git a/slownie.go b/slownie.go
index 3589bb0..37746f9 100644
--- a/slownie.go
+++ b/slownie.go
@@ -1,12 +1,10 @@
-package main
+package slownie
 
 import (
 	"errors"
 	"fmt"
 	"math"
-	"math/rand"
 	"strings"
-	"time"
 )
 
 var _smallNumbers = []string{
@@ -37,9 +35,19 @@ var _zlotyWord = []string{"złoty", "złote", "złotych"}
 
 var _groszyWord = []string{"grosz", "grosze", "groszy"}
 
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
+
+func toFixed(num float64, precision int) float64 {
+	output := math.Pow(10, float64(precision))
+	return float64(round(num*output)) / output
+}
+
 func split(value float64) (int64, int32) {
 	pre := int64(value)
-	post := int32(math.Mod((value*100 + 0.5), 100))
+	// post := int32((value - float64(pre)) * 100)
+	post := int32(math.Mod((value*100)+0.5, 100))
 	return pre, post
 }
 
@@ -116,7 +124,9 @@ func someSlownie(value int64, some []string) string {
 	return slownie(value) + " " + some[caseWord(int(value))]
 }
 
-func kwotaSlownie(input float64) (output string, err error) {
+// KwotaSlownie - return value in words of zloty and groszy
+func KwotaSlownie(input float64) (output string, err error) {
+	input = toFixed(input, 2)
 	defer func() {
 		if r := recover(); r != nil {
 			err = errors.New("too big number")
@@ -128,24 +138,5 @@ func kwotaSlownie(input float64) (output string, err error) {
 		input = -input
 	}
 	zloty, grosze := split(input)
-	return minusword + someSlownie(zloty, _zlotyWord) + fmt.Sprintf(" %d/100", grosze), nil
-}
-
-func main() {
-	r := rand.New(rand.NewSource(time.Now().UnixNano()))
-
-	for i := 0; i < 10; i++ {
-		x := r.Float64() * 10000000000000000
-		if kwota, err := kwotaSlownie(x); err == nil {
-			fmt.Printf("%.2f %s\n", x, kwota)
-		} else {
-			fmt.Printf("%.2f %s\n", x, err)
-		}
-	}
-	x := 4831179.50
-	if kwota, err := kwotaSlownie(x); err == nil {
-		fmt.Printf("%.2f %s\n", x, kwota)
-	} else {
-		fmt.Printf("%.2f %s\n", x, err)
-	}
+	return minusword + someSlownie(zloty, _zlotyWord) + fmt.Sprintf(" %02d/100", grosze), nil
 }
diff --git a/slownie_test.go b/slownie_test.go
new file mode 100644
index 0000000..8746864
--- /dev/null
+++ b/slownie_test.go
@@ -0,0 +1,82 @@
+package slownie
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"net/http"
+	"net/url"
+	"regexp"
+	"testing"
+	"time"
+)
+
+type slownieResponse struct {
+	Error int
+	Data  slownieResponseData `json:"data"`
+}
+
+type slownieResponseData struct {
+	Word   string
+	Header string
+}
+
+func TestKwotaSlownie(t *testing.T) {
+	client := &http.Client{}
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	space := regexp.MustCompile(`\s+`)
+
+	cookie1 := &http.Cookie{Name: "PHPSESSID", Value: "shplbjsjd3o4fdt9iutbb0o233", HttpOnly: false}
+
+	for i := 0; i < 1000; i++ {
+		x := r.Float64() * 1000000000
+		if kwota, err := KwotaSlownie(x); err == nil {
+			valueAsString := fmt.Sprintf("%.2f", x)
+
+			reqBody := url.Values{"number": {valueAsString}, "currency": {"pln"}, "country": {"pl"}, "csrf": {"bb50ebc27eaee017c346e88d9cbe2b94efb4b53a"}}
+			reqBodyStr := reqBody.Encode()
+			req, err := http.NewRequest("POST", "https://slownie.pl/ajax/word/get", bytes.NewBuffer([]byte(reqBodyStr)))
+			req.AddCookie(cookie1)
+			req.Header.Set("Content-type", "application/x-www-form-urlencoded")
+
+			resp, err := client.Do(req)
+			if err != nil {
+				t.Fatal("webrequest failed")
+			}
+
+			if resp.StatusCode != 200 {
+				t.Fatalf("codeL %d", resp.StatusCode)
+			}
+
+			defer resp.Body.Close()
+			body, err := ioutil.ReadAll(resp.Body)
+			if err != nil {
+				t.Fatal("parsing body failed")
+			}
+
+			gotSlownieResponse := slownieResponse{}
+			err = json.Unmarshal(body, &gotSlownieResponse)
+			if err != nil {
+				t.Fatal("unmarshaling body failed", err)
+				return
+			}
+
+			if gotSlownieResponse.Error != 0 {
+				t.Fatalf("got error: %d", gotSlownieResponse.Error)
+			}
+
+			their := space.ReplaceAllString(gotSlownieResponse.Data.Word, " ")
+			if their != kwota {
+				t.Errorf("%.2f\n", x)
+				t.Errorf("Got: %s\n", gotSlownieResponse.Data.Word)
+				t.Errorf("Own: %s\n", kwota)
+			} else {
+				t.Logf("%.2f sucessful", x)
+			}
+		} else {
+			t.Errorf("%.2f %s\n", x, err)
+		}
+	}
+}