CI: Fail Quick in Bash Scripts

Author: ax3l

tests/travis_before_install.sh

@@ -1,4 +1,5 @@
 set -x   # Show which command is being run
+set -e   # abort on errors
 
 case $TRAVIS_OS_NAME in
 linux)
@@ -45,4 +46,4 @@ echo "suppressStreamLogging = True" >> $HOME/.config/yt/ytrc
 cat $HOME/.config/yt/ytrc
 cp tests/matplotlibrc .
 
-set +x  # Do not show which command is being run (Travis default)
+set +x  # Do not show which command is being run (Travis default)

tests/travis_install.sh

@@ -1,4 +1,5 @@
 set -x   # Show which command is being run
+set -e   # abort on errors
 
 echo "Travis build stage: $TRAVIS_BUILD_STAGE_NAME"
 
@@ -42,4 +43,4 @@ fi
 # Step 3: install yt
 $PIP install -e .
 
-set +x  # Do not show which command is being run (Travis default)
+set +x  # Do not show which command is being run (Travis default)