Adds test coverage for alpine linux.

.travis.yml

@@ -21,6 +21,7 @@ before_script:
 script:
   - yarn test-formatting
   - yarn test
+  - yarn docker-test
 after_success:
   - yarn run coverage
 # - (send to coveralls)

package.json

@@ -4,6 +4,8 @@
   "scripts": {
     "build": "tsc",
     "dev": "tsc -w",
+    "build-docker": "docker build -t chrome-launcher:test -f test/Dockerfile .",
+    "docker-test": "docker run --privileged -t chrome-launcher:test",
     "test": "mocha --require ts-node/register --reporter=dot test/**/*-test.ts --timeout=10000",
     "coverage": "nyc yarn test && nyc report --reporter=text-lcov > lcov.info",
     "test-formatting": "test/check-formatting.sh",

test/Dockerfile

@@ -0,0 +1,25 @@
+FROM node:alpine
+
+WORKDIR /app
+
+#install chromium/yarn
+RUN apk --update --no-cache add chromium xvfb curl bash binutils tar \
+    && curl -o- -L https://yarnpkg.com/install.sh | bash \
+    && apk del curl tar binutils
+
+COPY package.json .
+COPY yarn.lock .
+
+ENV DISPLAY :99.0
+ENV CHROME_PATH /usr/lib/chrome
+
+#install
+RUN yarn --frozen-lockfile
+
+#copy rest of files in
+COPY . .
+
+#build everything
+RUN yarn build
+
+ENTRYPOINT [ "/bin/bash", "-c", "yarn test-formatting && yarn test" ]