diff --git a/font_test.go b/font_test.go
new file mode 100644
index 0000000..aba90f8
--- /dev/null
+++ b/font_test.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"testing"
+)
+
+func TestEmbeddedFontHash(t *testing.T) {
+	// Check the embedded font did not change
+	font, err := Asset("assets/DejaVuSans.ttf")
+	if err != nil {
+		t.Errorf("Could not load embedded font: %s", err)
+	}
+
+	hash := fmt.Sprintf("%x", sha256.Sum256(font))
+	if hash != "3fdf69cabf06049ea70a00b5919340e2ce1e6d02b0cc3c4b44fb6801bd1e0d22" {
+		t.Errorf("Embedded font changed: %s", hash)
+	}
+}
+
+func TestStringLength(t *testing.T) {
+	// As the font is embedded into the source the length calculation should not change
+	w, err := calculateTextWidth("Test 123 öäüß … !@#%&")
+	if err != nil {
+		t.Errorf("Text length errored: %s", err)
+	}
+	if w != 138 {
+		t.Errorf("Text length changed and is now %d", w)
+	}
+}
diff --git a/main.go b/main.go
index d21765d..8f2f525 100644
--- a/main.go
+++ b/main.go
@@ -23,11 +23,15 @@ func main() {
 		port = ":3000"
 	}
 
+	http.Handle("/", generateMux())
+	http.ListenAndServe(port, nil)
+}
+
+func generateMux() *mux.Router {
 	r := mux.NewRouter()
 	r.HandleFunc("/v1/badge", generateBadge).Methods("GET")
 
-	http.Handle("/", r)
-	http.ListenAndServe(port, nil)
+	return r
 }
 
 func generateBadge(res http.ResponseWriter, r *http.Request) {
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..2c32173
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,132 @@
+package main
+
+import (
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"testing"
+)
+
+func TestCreateBadge(t *testing.T) {
+	badge := string(createBadge("API", "Documentation", "4c1"))
+
+	if !strings.Contains(badge, ">API</text>") {
+		t.Error("Did not found node with text 'API'")
+	}
+
+	if !strings.Contains(badge, "<path fill=\"#4c1\"") {
+		t.Error("Did not find color coding for path")
+	}
+
+	if !strings.Contains(badge, ">Documentation</text>") {
+		t.Error("Did not found node with text 'Documentation'")
+	}
+}
+
+func TestHttpResponseMissingParameters(t *testing.T) {
+	resp := httptest.NewRecorder()
+
+	uri := "/v1/badge"
+
+	req, err := http.NewRequest("GET", uri, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	generateMux().ServeHTTP(resp, req)
+	if p, err := ioutil.ReadAll(resp.Body); err != nil {
+		t.Fail()
+	} else {
+		if resp.Code != http.StatusInternalServerError {
+			t.Errorf("Response code should be %d, is %d", http.StatusInternalServerError, resp.Code)
+		}
+
+		if string(p) != "You must specify parameters 'title' and 'text'.\n" {
+			t.Error("Response message did not match test")
+		}
+	}
+
+}
+
+func TestHttpResponseWithoutColor(t *testing.T) {
+	resp := httptest.NewRecorder()
+
+	uri := "/v1/badge?"
+	params := url.Values{
+		"title": []string{"API"},
+		"text":  []string{"Documentation"},
+	}
+
+	req, err := http.NewRequest("GET", uri+params.Encode(), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	generateMux().ServeHTTP(resp, req)
+	if p, err := ioutil.ReadAll(resp.Body); err != nil {
+		t.Fail()
+	} else {
+		if resp.Code != http.StatusOK {
+			t.Errorf("Response code should be %d, is %d", http.StatusInternalServerError, resp.Code)
+		}
+
+		if resp.Header().Get("Content-Type") != "image/svg+xml" {
+			t.Errorf("Response had wrong Content-Type: %s", resp.Header().Get("Content-Type"))
+		}
+
+		// Check whether there is a SVG in the response, format checks are in other checks
+		if !strings.Contains(string(p), "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"133\" height=\"20\">") {
+			t.Error("Response message did not match test")
+		}
+
+		if !strings.Contains(string(p), "#4c1") {
+			t.Error("Default color was not set")
+		}
+	}
+
+}
+
+func TestHttpResponseWithColor(t *testing.T) {
+	resp := httptest.NewRecorder()
+
+	uri := "/v1/badge?"
+	params := url.Values{
+		"title": []string{"API"},
+		"text":  []string{"Documentation"},
+		"color": []string{"572"},
+	}
+
+	req, err := http.NewRequest("GET", uri+params.Encode(), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	generateMux().ServeHTTP(resp, req)
+	if p, err := ioutil.ReadAll(resp.Body); err != nil {
+		t.Fail()
+	} else {
+		if resp.Code != http.StatusOK {
+			t.Errorf("Response code should be %d, is %d", http.StatusInternalServerError, resp.Code)
+		}
+
+		if resp.Header().Get("Content-Type") != "image/svg+xml" {
+			t.Errorf("Response had wrong Content-Type: %s", resp.Header().Get("Content-Type"))
+		}
+
+		// Check whether there is a SVG in the response, format checks are in other checks
+		if !strings.Contains(string(p), "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"133\" height=\"20\">") {
+			t.Error("Response message did not match test")
+		}
+
+		if strings.Contains(string(p), "#4c1") {
+			t.Error("Default color is present with color given")
+		}
+
+		if !strings.Contains(string(p), "#572") {
+			t.Error("Given color is not present in SVG")
+		}
+	}
+
+}