diff --git a/test/docker/Dockerfile b/test/docker/Dockerfile
index 34c259ea..568e17b6 100644
--- a/test/docker/Dockerfile
+++ b/test/docker/Dockerfile
@@ -16,47 +16,47 @@ RUN $INSTALL wget ca-certificates bzip2 unzip
 # firefox setup
 RUN $INSTALL libgtk-3-0 libasound2 libx11-xcb1
 
-RUN wget https://download-installer.cdn.mozilla.net/pub/firefox/releases/${FIREFOX_VERSION}/linux-x86_64/en-US/firefox-${FIREFOX_VERSION}.tar.bz2
-RUN tar -xf firefox-${FIREFOX_VERSION}.tar.bz2
-RUN mv firefox /usr/local/share
-RUN ln -s /usr/local/share/firefox/firefox /usr/local/bin
-RUN rm firefox-${FIREFOX_VERSION}.tar.bz2
+RUN wget https://download-installer.cdn.mozilla.net/pub/firefox/releases/${FIREFOX_VERSION}/linux-x86_64/en-US/firefox-${FIREFOX_VERSION}.tar.bz2 && \
+    tar -xf firefox-${FIREFOX_VERSION}.tar.bz2 && \
+    mv firefox /usr/local/share && \
+    ln -s /usr/local/share/firefox/firefox /usr/local/bin && \
+    rm firefox-${FIREFOX_VERSION}.tar.bz2
 
 RUN firefox --version
 
 # geckodriver setup
-RUN wget https://github.com/mozilla/geckodriver/releases/download/v${GECKODRIVER_VERSION}/geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz
-RUN tar -xf geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz
-RUN mv geckodriver /usr/local/bin
-RUN rm geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz
+RUN wget https://github.com/mozilla/geckodriver/releases/download/v${GECKODRIVER_VERSION}/geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz && \
+    tar -xf geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz && \
+    mv geckodriver /usr/local/bin && \
+    rm geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz
 
 RUN geckodriver --version
 
 # chrome setup
-RUN wget https://dl.google.com/linux/deb/pool/main/g/google-chrome-stable/google-chrome-stable_${CHROME_VERSION}_amd64.deb
-RUN $INSTALL ./google-chrome-stable_${CHROME_VERSION}_amd64.deb
-RUN rm google-chrome-stable_${CHROME_VERSION}_amd64.deb
+RUN wget https://dl.google.com/linux/deb/pool/main/g/google-chrome-stable/google-chrome-stable_${CHROME_VERSION}_amd64.deb && \
+    $INSTALL ./google-chrome-stable_${CHROME_VERSION}_amd64.deb && \
+    rm google-chrome-stable_${CHROME_VERSION}_amd64.deb
 
 RUN google-chrome --version
 
 # chromedirver setup
-RUN wget https://edgedl.me.gvt1.com/edgedl/chrome/chrome-for-testing/${CHROMEDRIVER_VERSION}/linux64/chromedriver-linux64.zip
-RUN unzip chromedriver-linux64.zip
-RUN mv chromedriver-linux64/chromedriver /usr/local/bin
-RUN rm -rf chromedriver-linux64
-RUN rm chromedriver-linux64.zip
+RUN wget https://edgedl.me.gvt1.com/edgedl/chrome/chrome-for-testing/${CHROMEDRIVER_VERSION}/linux64/chromedriver-linux64.zip && \
+    unzip chromedriver-linux64.zip && \
+    mv chromedriver-linux64/chromedriver /usr/local/bin && \
+    rm -rf chromedriver-linux64 && \
+    rm chromedriver-linux64.zip
 
 RUN geckodriver --version
 
 # phantomjs setup
-RUN $INSTALL build-essential chrpath libssl-dev libxft-dev
-RUN $INSTALL libfreetype6 libfreetype6-dev libfontconfig1 libfontconfig1-dev
+RUN $INSTALL build-essential chrpath libssl-dev libxft-dev \
+    libfreetype6 libfreetype6-dev libfontconfig1 libfontconfig1-dev
 
-RUN wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-${PHANTOMJS_VERSION}-linux-x86_64.tar.bz2
-RUN tar -xf phantomjs-${PHANTOMJS_VERSION}-linux-x86_64.tar.bz2
-RUN mv phantomjs-${PHANTOMJS_VERSION}-linux-x86_64/bin/phantomjs /usr/local/bin
-RUN rm -rf phantomjs-${PHANTOMJS_VERSION}-linux-x86_64
-RUN rm phantomjs-${PHANTOMJS_VERSION}-linux-x86_64.tar.bz2
+RUN wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-${PHANTOMJS_VERSION}-linux-x86_64.tar.bz2 && \
+    tar -xf phantomjs-${PHANTOMJS_VERSION}-linux-x86_64.tar.bz2 && \
+    mv phantomjs-${PHANTOMJS_VERSION}-linux-x86_64/bin/phantomjs /usr/local/bin && \
+    rm -rf phantomjs-${PHANTOMJS_VERSION}-linux-x86_64 && \
+    rm phantomjs-${PHANTOMJS_VERSION}-linux-x86_64.tar.bz2
 
 # fix weird phantomjs issue
 ENV OPENSSL_CONF=/etc/ssl
@@ -65,7 +65,7 @@ RUN phantomjs --version
 
 # install python dependencies
 ADD requirements.txt .
-RUN $INSTALL python3 python3-pip
-RUN pip install --upgrade pip
-RUN pip install -r requirements.txt
-RUN rm requirements.txt
+RUN $INSTALL python3 python3-pip && \
+    pip install --upgrade pip && \
+    pip install -r requirements.txt && \
+    rm requirements.txt