Fix wrong path expansion in end-to-end test (#2388)

* Update e2e-kitchensink.sh

* Try again (differently)

Author: gaearon

tasks/e2e-kitchensink.sh

@@ -156,13 +156,13 @@ REACT_APP_SHELL_ENV_MESSAGE=fromtheshell \
   CI=true \
   NODE_PATH=src \
   NODE_ENV=test \
-  npm test -- --no-cache --testPathPattern="/src/"
+  npm test -- --no-cache --testPathPattern=src
 
 # Catch when no tests are detected
 testsList=$(REACT_APP_SHELL_ENV_MESSAGE=fromtheshell \
   CI=true \
   NODE_PATH=src \
-  npm test -- --no-cache --testPathPattern="/src/" --listTests)
+  npm test -- --no-cache --testPathPattern=src --listTests)
 
 if [[ ${testsList} =~ "[]" ]]; then
   exit 1
@@ -230,7 +230,7 @@ REACT_APP_SHELL_ENV_MESSAGE=fromtheshell \
   CI=true \
   NODE_PATH=src \
   NODE_ENV=test \
-  npm test -- --no-cache --testPathPattern='/src/'
+  npm test -- --no-cache --testPathPattern=src
 
 # Test "development" environment
 tmp_server_log=`mktemp`