add: tests and code cov

.travis.yml

@@ -1,4 +1,7 @@
 language: go
 
 go:
-  - 1.9
+  - 1.9
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

README.md

@@ -4,6 +4,7 @@
 
 [![GoDoc](https://godoc.org/github.com/steambap/captcha?status.svg)](https://godoc.org/github.com/steambap/captcha)
 [![Build Status](https://travis-ci.org/steambap/captcha.svg)](https://travis-ci.org/steambap/captcha)
+[![codecov](https://codecov.io/gh/steambap/captcha/branch/master/graph/badge.svg)](https://codecov.io/gh/steambap/captcha)
 [![Go Report Card](https://goreportcard.com/badge/github.com/steambap/captcha)](https://goreportcard.com/report/github.com/steambap/captcha)
 
 </div>

captcha_test.go

@@ -0,0 +1,15 @@
+package captcha
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestNewCaptcha(t *testing.T) {
+	data, err := New(150, 50)
+	if err != nil {
+		t.Fatal(err)
+	}
+	buf := new(bytes.Buffer)
+	data.WriteTo(buf)
+}

hsva_test.go

@@ -1,6 +1,7 @@
 package captcha
 
 import (
+	"fmt"
 	"image/color"
 	"testing"
 )
@@ -8,3 +9,66 @@ import (
 func TestHSVAInterface(t *testing.T) {
 	var _ color.Color = hsva{}
 }
+
+func TestConversionGray(t *testing.T) {
+	var white1 color.Color = hsva{h: 0.0, s: 0.0, v: 1.0, a: uint8(255)}
+	var white2 color.Color = color.RGBA{R: uint8(255), G: uint8(255), B: uint8(255), A: uint8(255)}
+
+	if err := eq(white1, white2); err != nil {
+		t.Fatal(err)
+	}
+
+	var black1 color.Color = hsva{h: 0.0, s: 0.0, v: 0.0, a: uint8(255)}
+	var black2 color.Color = color.RGBA{R: uint8(0), G: uint8(0), B: uint8(0), A: uint8(255)}
+
+	if err := eq(black1, black2); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestConversionRGB(t *testing.T) {
+	var yellow1 color.Color = hsva{h: 60.0 / 360.0, s: 0.6, v: 1.0, a: uint8(255)}
+	var yellow2 color.Color = color.RGBA{R: uint8(255), G: uint8(255), B: uint8(102), A: uint8(255)}
+
+	if err := eq(yellow1, yellow2); err != nil {
+		t.Fatal(err)
+	}
+
+	var green1 color.Color = hsva{h: 120.0 / 360.0, s: 1.0, v: 0.8, a: uint8(255)}
+	var green2 color.Color = color.RGBA{R: uint8(0), G: uint8(204), B: uint8(0), A: uint8(255)}
+
+	if err := eq(green1, green2); err != nil {
+		t.Fatal(err)
+	}
+
+	var teal1 color.Color = hsva{h: 180.0 / 360.0, s: 0.5, v: 0.8, a: uint8(255)}
+	var teal2 color.Color = color.RGBA{R: uint8(102), G: uint8(204), B: uint8(204), A: uint8(255)}
+
+	if err := eq(teal1, teal2); err != nil {
+		t.Fatal(err)
+	}
+
+	var blue1 color.Color = hsva{h: 240.0 / 360.0, s: 0.75, v: 0.8, a: uint8(255)}
+	var blue2 color.Color = color.RGBA{R: uint8(51), G: uint8(51), B: uint8(204), A: uint8(255)}
+
+	if err := eq(blue1, blue2); err != nil {
+		t.Fatal(err)
+	}
+
+	var pink1 color.Color = hsva{h: 300.0 / 360.0, s: 0.2, v: 1.0, a: uint8(255)}
+	var pink2 color.Color = color.RGBA{R: uint8(255), G: uint8(204), B: uint8(255), A: uint8(255)}
+
+	if err := eq(pink1, pink2); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func eq(c0, c1 color.Color) error {
+	r0, g0, b0, a0 := c0.RGBA()
+	r1, g1, b1, a1 := c1.RGBA()
+	if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
+		return fmt.Errorf("got  0x%04x 0x%04x 0x%04x 0x%04x\nwant 0x%04x 0x%04x 0x%04x 0x%04x",
+			r0, g0, b0, a0, r1, g1, b1, a1)
+	}
+	return nil
+}