Use instafail so we can see what's going on

.circleci/config.yml

@@ -23,7 +23,7 @@ jobs:
             sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 80 --slave /usr/bin/g++ g++ /usr/bin/g++-8
             sudo update-alternatives --set gcc /usr/bin/gcc-8
 
-            sudo pip install pytest-xdist selenium PyYAML
+            sudo pip install pytest-xdist pytest-instafail selenium PyYAML
 
             # Get recent version of Firefox and geckodriver
             wget -O firefox.tar.bz2 https://download.mozilla.org/\?product\=firefox-nightly-latest-ssl\&os\=linux64\&lang\=en-US

Makefile

@@ -98,7 +98,7 @@ build/renderedhtml.css: src/renderedhtml.less
 
 
 test: all build/test.html build/test_data.txt
-	py.test test -v
+	py.test test -v --instafail
 
 
 build/test_data.txt: test/data.txt

README.md

@@ -37,7 +37,7 @@ Additional build prerequisites are:
 
 Install the following dependencies into the default Python installation:
 
-   `pip install pytest selenium`
+   `pip install pytest selenium pytest-instafail`
 
 Install [geckodriver](https://github.com/mozilla/geckodriver/releases) somewhere
 on your `PATH`.