Catch "No tests found" during CI (facebook#2387)

Author: EnoahNetzach

tasks/e2e-kitchensink.sh

@@ -158,6 +158,16 @@ REACT_APP_SHELL_ENV_MESSAGE=fromtheshell \
   NODE_ENV=test \
   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)
+
+if [[ ${testsList} =~ "[]" ]]; then
+  exit 1
+fi
+
 # Test "development" environment
 tmp_server_log=`mktemp`
 PORT=3001 \