fix(ci): retry e2e demo site tests

.travis.yml

@@ -261,4 +261,4 @@ jobs:
       if: (repo = prymitive/karma AND type != pull_request) OR (fork = true AND type = pull_request)
       <<: *DEFAULTS_JS
       script:
-        - make -C ui test-demo
+        - travis_retry make -C ui test-demo

ui/Makefile

@@ -19,7 +19,7 @@ test-js: node_modules/jest/bin/jest.js
 
 .PHONY: test-demo
 test-demo: node_modules/jest/bin/jest.js
-	CI=true ./node_modules/.bin/jest --config e2e/jest.config.js --runInBand e2e/demo.test.js
+	CI=true ./node_modules/.bin/jest --preset=jest-puppeteer --runInBand e2e/demo.test.js
 
 .PHONY: test-percy
 test-percy: node_modules/@storybook/react/bin/build.js

ui/e2e/jest.config.js

@@ -1,4 +0,0 @@
-module.exports = {
-  preset: "jest-puppeteer",
-  testRegex: "./*\\.test\\.js$",
-};