diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 00000000..f48469bd
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,10 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/golang:1.13-buster
+    steps:
+      - checkout
+      - run: sudo apt-get install -qq -y libavdevice-dev libavfilter-dev libswscale-dev libavcodec-dev libavformat-dev libswresample-dev libavutil-dev
+      - run: go get -v -t -d ./...
+      - run: go test -v ./...
diff --git a/README.md b/README.md
index 9e129c20..149177a8 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Golang binding for FFmpeg
 A comprehensive binding to the ffmpeg video/audio manipulation library.
 
 [![GoDoc](https://godoc.org/github.com/giorgisio/goav?status.svg)](https://godoc.org/github.com/giorgisio/goav)
+[![CircleCI](https://circleci.com/gh/giorgisio/goav/tree/master.svg?style=shield)](https://circleci.com/gh/giorgisio/goav/tree/master)
+
 
 ## Usage
 
@@ -66,12 +68,12 @@ export FFMPEG_ROOT=$HOME/ffmpeg
 export CGO_LDFLAGS="-L$FFMPEG_ROOT/lib/ -lavcodec -lavformat -lavutil -lswscale -lswresample -lavdevice -lavfilter"
 export CGO_CFLAGS="-I$FFMPEG_ROOT/include"
 export LD_LIBRARY_PATH=$HOME/ffmpeg/lib
-``` 
+```
 
-``` 
+```
 go get github.com/giorgisio/goav
 
-``` 
+```
 
 ## More Examples
 
diff --git a/avcodec/rational.go b/avcodec/rational.go
index ee17df03..33abb654 100644
--- a/avcodec/rational.go
+++ b/avcodec/rational.go
@@ -26,7 +26,7 @@ func (r Rational) Den() int {
 }
 
 func (r Rational) String() string {
-	return fmt.Sprintln("%d/%d", int(r.num), int(r.den))
+	return fmt.Sprintf("%d/%d", int(r.num), int(r.den))
 }
 
 func (r *Rational) Assign(o Rational) {
diff --git a/example/sample.mp4 b/examples/sample.mp4
similarity index 100%
rename from example/sample.mp4
rename to examples/sample.mp4
diff --git a/example/tutorial01.go b/examples/save-frame/main.go
similarity index 100%
rename from example/tutorial01.go
rename to examples/save-frame/main.go
diff --git a/example/versions.go b/examples/versions/main.go
similarity index 99%
rename from example/versions.go
rename to examples/versions/main.go
index 2f4d9d07..ddf5726b 100644
--- a/example/versions.go
+++ b/examples/versions/main.go
@@ -24,5 +24,4 @@ func main() {
 	log.Printf("AvUtil Version:\t%v", avutil.AvutilVersion())
 	log.Printf("AvCodec Version:\t%v", avcodec.AvcodecVersion())
 	log.Printf("Resample Version:\t%v", swresample.SwresampleLicense())
-
 }
diff --git a/go.mod b/go.mod
index 7f3b18fc..de40c7e1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,5 @@
 module github.com/giorgisio/goav
 
-require (
-	github.com/gosuri/uilive v0.0.0-20170323041506-ac356e6e42cd // indirect
-	github.com/gosuri/uiprogress v0.0.0-20170224063937-d0567a9d84a1 // indirect
-)
+require github.com/stretchr/testify v1.4.0
+
+go 1.13
diff --git a/go.sum b/go.sum
index 79367829..8fdee585 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,11 @@
-github.com/gosuri/uilive v0.0.0-20170323041506-ac356e6e42cd h1:1e+0Z+T4t1mKL5xxvxXh5FkjuiToQGKreCobLu7lR3Y=
-github.com/gosuri/uilive v0.0.0-20170323041506-ac356e6e42cd/go.mod h1:qkLSc0A5EXSP6B04TrN4oQoxqFI7A8XvoXSlJi8cwk8=
-github.com/gosuri/uiprogress v0.0.0-20170224063937-d0567a9d84a1 h1:4iPLwzjiWGBQnYdtKbg/JNlGlEEvklrrMdjypdA1LKQ=
-github.com/gosuri/uiprogress v0.0.0-20170224063937-d0567a9d84a1/go.mod h1:C1RTYn4Sc7iEyf6j8ft5dyoZ4212h8G1ol9QQluh5+0=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=