Try circle-ci

I don't know why browserstack tests aren't running in travis. Perhaps
they run in circle?

.circleci/config.yml

@@ -0,0 +1,30 @@
+# Javascript Node CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-javascript/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/node:11.5-browsers-legacy
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "package.json" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run: yarn install
+
+      - save_cache:
+          paths:
+            - node_modules
+          key: v1-dependencies-{{ checksum "package.json" }}
+
+      - run: yarn test

karma.conf.js

@@ -36,7 +36,7 @@ module.exports = function (config) {
     colors: true,
     logLevel: config.LOG_INFO,
     autoWatch: true,
-    browsers: process.env.BROWSERS === 'all' ? Object.keys(browsers) : [
+    browsers: process.env.BROWSERS === 'all' ? Object.keys(browsers).slice(1) : [
       config.singleRun ? 'Chrome_headless_without_security' : 'Chrome_without_security'
     ],