diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c77069e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+testrunner
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0bf1339
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+current_dir := $(shell pwd)
+
+sync-lib-and-bin-from-testrunner:
+	# usage:
+	#   cd ../ && git clone https://github.com/heroku/heroku-buildpack-testrunner
+	# 	make sync-lib-and-bin-from-testrunner testrunner-dir=../heroku-buildpack-testrunner
+	mkdir -p ${current_dir}/testrunner
+
+	rm -rf ${current_dir}/testrunner/lib
+	cp -rf ${testrunner-dir}/lib ${current_dir}/testrunner/lib
+
+	rm -rf ${current_dir}/testrunner/bin
+	cp -rf ${testrunner-dir}/bin ${current_dir}/testrunner/bin
+
+prepare-testrunner-image:
+	# Prepare test-runner image for "Different OS"
+	#
+	# You will get following images by build this target
+	#
+	# 1. heroku-16-buildpack-test-runner
+	# 2. heroku-20-buildpack-test-runner
+	docker build . \
+		-f $(current_dir)/docker/Dockerfile.testrunner \
+		-t heroku-16-buildpack-test-runner \
+		--build-arg ubuntu_version=16
+
+	docker build . \
+		-f $(current_dir)/docker/Dockerfile.testrunner \
+		-t heroku-20-buildpack-test-runner \
+		--build-arg ubuntu_version=20
+
+docker-test:
+	# usage
+	# make docker-test image=heroku-20-buildpack-test-runner
+	docker run -it -v $(current_dir):/app/buildpack:ro ${image}
diff --git a/bin/compile b/bin/compile
index 5159242..06efed4 100755
--- a/bin/compile
+++ b/bin/compile
@@ -3,6 +3,10 @@
 
 set -e
 
+WHITE="\e[97m"
+GREEN="\e[32m"
+YELLOW="\e[33m"
+
 BUILD_DIR=$1
 CACHE_DIR=$2
 
@@ -11,40 +15,45 @@ TMP_PATH="$BUILD_DIR/tmp"
 mkdir -p $CACHE_DIR $BIN_PATH $TMP_PATH
 
 [ -z "$WKHTMLTOPDF_VERSION" ] && WKHTMLTOPDF_VERSION="0.12.4"
-WKHTMLTOPDF_URL="https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/${WKHTMLTOPDF_VERSION}/wkhtmltox-${WKHTMLTOPDF_VERSION}_linux-generic-amd64.tar.xz"
-WKHTMLTOPDF_TAR="$CACHE_DIR/wkhtmltox.tar.xz"
-WKHTMLTOPDF_PATH="$TMP_PATH/wkhtmltox"
-WKHTMLTOPDF_BINARIES="$WKHTMLTOPDF_PATH/bin"
 
 BIN_DIR=$(cd $(dirname $0); pwd)
 FONTS_DIR=$(cd "$BIN_DIR/../fonts"; pwd)
 
-if [ -f $WKHTMLTOPDF_TAR ]; then
-  echo "-----> Using wkhtmltopdf tar from cache"
+echo -e "${GREEN}-----> OS${WHITE}"
+echo $OSTYPE
+echo $(cat /etc/os-release | grep VERSION_CODENAME)
+
+OS_VERSIONCODE=$(cat /etc/os-release | grep VERSION_CODENAME)
+
+if [[ "$OS_VERSIONCODE" == *"VERSION_CODENAME=focal"* ]]; then
+    # focal is codename of ubuntu 20
+    WKHTMLTOPDF_DEB="wkhtmltox_0.12.5-1.focal_amd64.deb"
+elif [[ "$OS_VERSIONCODE" == *"VERSION_CODENAME=xenial"* ]]; then
+    # install wkhtmltopdf for ubuntu 16
+    WKHTMLTOPDF_DEB="wkhtmltox_0.12.5-1.xenial_amd64.deb"
 else
-  echo "-----> Downloading wkhtmltopdf tar"
-  curl -L $WKHTMLTOPDF_URL -o $WKHTMLTOPDF_TAR
+    # default version is for ubuntu 16
+    echo -e "${YELLOW}WARNING: ${OS_VERSIONCODE} not supported, install default wkhtmltopdf deb for Ubuntu 16${WHITE}"
+    WKHTMLTOPDF_DEB="wkhtmltox_0.12.5-1.xenial_amd64.deb"
 fi
 
-echo "-----> Unpacking tar"
-tar -xf $WKHTMLTOPDF_TAR -C $TMP_PATH
+WKHTMLTOPDF_URL="https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/${WKHTMLTOPDF_DEB}"
 
-echo "-----> Setting permissions"
-chmod +x $WKHTMLTOPDF_BINARIES/*
+echo -e "${GREEN}-----> Downloading wkhtmltopdf deb${WHITE}"
+wget $WKHTMLTOPDF_URL
 
-echo "-----> Moving binaries to the right place"
-mv $WKHTMLTOPDF_BINARIES/* $BIN_PATH/
+echo -e "${GREEN}-----> Install wkhtmltopdf${WHITE}"
+apt update
+yes | apt install xfonts-75dpi xfonts-base
+yes | dpkg -i ./$WKHTMLTOPDF_DEB
 
-mkdir -p "$BUILD_DIR"/.profile.d
-cat <<EOF >"$BUILD_DIR"/.profile.d/wkhtmltopdf.sh
-export PATH="/app/bin:\$PATH"
-EOF
+echo -e "${GREEN}-----> Cleaning up${WHITE}"
+rm -rf $WKHTMLTOPDF_DEB
 
-echo "-----> Cleaning up"
-rm -rf $WKHTMLTOPDF_PATH
-
-echo "-----> Installing fonts"
+echo -e "${GREEN}-----> Installing fonts${WHITE}"
 mkdir -p $1/.fonts
 ls $FONTS_DIR
 cp $FONTS_DIR/* $1/.fonts/
 fc-cache -fv $1/.fonts
+
+exit 0
diff --git a/docker/Dockerfile.testrunner b/docker/Dockerfile.testrunner
new file mode 100644
index 0000000..3f01041
--- /dev/null
+++ b/docker/Dockerfile.testrunner
@@ -0,0 +1,17 @@
+ARG ubuntu_version
+
+FROM heroku/heroku:$ubuntu_version
+
+WORKDIR /usr/local/lib
+
+RUN curl --silent https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/shunit2/shunit2-2.1.6.tgz | tar xz
+
+ENV SHUNIT_HOME /usr/local/lib/shunit2-2.1.6
+
+# content in directory testrunner is copy from https://github.com/heroku/heroku-buildpack-testrunner
+# it provide utils to run test of this project
+ADD testrunner/bin /app/testrunner/bin
+ADD testrunner/lib /app/testrunner/lib
+
+CMD ["-c", "/app/buildpack"]
+ENTRYPOINT ["/app/testrunner/bin/run"]
diff --git a/test/compile_test.sh b/test/compile_test.sh
new file mode 100644
index 0000000..a8cb26e
--- /dev/null
+++ b/test/compile_test.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+. ${BUILDPACK_TEST_RUNNER_HOME}/lib/test_utils.sh
+
+testCompile() {
+    ${BUILDPACK_HOME}/bin/compile ${BUILD_DIR} ${BUILD_DIR}  # this comand can see echo logs
+
+    wkhtmltopdf http://google.com google.pdf
+
+    assertEquals "google.pdf" "$(ls -a | grep google.pdf)"
+}