Run karma task only in test environment

and fails otherwise, as it needs the defaults defined in test environment

README.md

@@ -98,6 +98,14 @@ The site is configured to use
 startup time while Rails loads. See the Zeus github page for
 usage instructions.
 
+Once [npm dependencies are
+installed](https://github.com/openfoodfoundation/openfoodnetwork/wiki/Karma), AngularJS tests can be run with:
+
+    ./script/karma run
+
+If you want karma to automatically rerun the tests on file modification, use:
+
+    ./script/karma start
 
 ## Credits
 

lib/tasks/karma.rake

@@ -1,14 +1,22 @@
 namespace :karma  do
-  task :start => :environment do
+  task :start => :environment do |task|
+    continue_only_in_test_env task
     with_tmp_config :start
   end
 
-  task :run => :environment do
+  task :run => :environment do |task|
+    continue_only_in_test_env task
     with_tmp_config :start, "--single-run"
   end
 
   private
 
+  def continue_only_in_test_env task
+    if Rails.env != 'test'
+      raise "Task must be called in test environment:\n  bundle exec rake #{task.name} RAILS_ENV=test"
+    end
+  end
+
   def with_tmp_config(command, args = nil)
     Tempfile.open('karma_unit.js', Rails.root.join('tmp') ) do |f|
       f.write unit_js(application_spec_files << i18n_file)

script/ci/run_js_tests.sh

@@ -14,4 +14,4 @@ echo "--- Bundling"
 bundle install
 
 echo "--- Running tests"
-bundle exec rake karma:run
+./script/karma run

script/karma

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+task="$1"
+
+if [ "$task" = "run" ] || [ "$task" = "start" ]; then
+  exec bundle exec rake "karma:$task" RAILS_ENV=test
+else
+  echo "Usage:"
+  echo "  $0 run   # to run the tests once"
+  echo "  $0 start # to run the tests on every file modification"
+  exit 1
+fi
+