Merge pull request #145 from oschuett/master

Add tests for binder/apt.txt and binder/postBuild

tests/venv/binder-dir/apt.txt

@@ -0,0 +1 @@
+thiswontwork

tests/venv/binder-dir/binder/apt.txt

@@ -0,0 +1 @@
+gfortran

tests/venv/binder-dir/postBuild

@@ -0,0 +1,3 @@
+#!/bin/bash
+echo "This should never run"
+exit 1

tests/venv/binder-dir/verify

@@ -1,4 +1,5 @@
 #!/bin/bash
+which gfortran
 test -z $(pip list | grep scipy)
 jupyter nbextension list
 jupyter nbextension list | grep 'jupyter-leaflet' | grep enabled