For running single acceptance test, add an optional argument that will enable us…

For running single acceptance test, add an optional argument that will enable us to supply an argument if we want to just run one single test

Examples:
>  make test-acceptance tests.py:FullWorkflowOverrideTest.test_staff_override_at_end
Runs test_staff_override_at_end test of FullWorkflowOverrideTest class

>  make test-acceptance tests.py:FullWorkflowOverrideTest
Runs tests for FullWorkflowOverrideTest class

>  make test-acceptance tests.py
Runs all tests in tests.py

> make test-acceptance
This would work as it was previously i.e run all the acceptance tests

Makefile

@@ -72,7 +72,7 @@ test-js-debug: render-templates
 test-sandbox: test-acceptance test-a11y
 
 test-acceptance:
-	./scripts/test-acceptance.sh tests
+	./scripts/test-acceptance.sh
 
 test-a11y:
 	./scripts/test-acceptance.sh accessibility

scripts/test-acceptance.sh

@@ -12,7 +12,7 @@
 #
 #   Usage:
 #
-#       ./test-acceptance.sh {test_file}
+#       ./test-acceptance.sh {test}
 #
 ############################################################
 
@@ -33,6 +33,10 @@ cd test/logs
 
 test_name="${1:-acceptance}"
 
+if [[ -z ${test} ]]; then
+    export test="tests.py"
+fi
+
 
 # The machines that these tests run on in jenkins have an old
 # version of npm which doesn't seem to work with the
@@ -53,4 +57,4 @@ if [[ "${test_name}" = "accessibility" ]]; then
 fi
 
 echo "Running acceptance tests from ${test_name}.py against the sandbox..."
-nosetests ../acceptance/${test_name}.py --with-xunit --xunit-file=../acceptance/xunit-${test_name}.xml
+nosetests ../acceptance/${test} --with-xunit --xunit-file=../acceptance/xunit-${test_name}.xml