Fixing GitHub actions (#853).

.github/workflows/nodejs.yml

@@ -1,29 +1,43 @@
-# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
-
 name: Node.js CI
 
 on:
   push:
-    branches: [ ethers-v5-beta ]
+    branches:
+      - ethers-v5-beta
 
 jobs:
-  build:
+  test-node:
 
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x]
+        node-version: [8.x, 10.x, 12.x, 13.x]
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: npm ci
-    - run: npm run bootstap
-    - run: npm run build
-    - run: npm test
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - uses: actions/checkout@v2
+      - run: npm ci
+      - run: npm run bootstrap
+      - run: npm run test-node
+
+  test-browser:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        module: [ 'esm', 'umd' ]
+
+    steps:
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - uses: actions/checkout@v2
+      - run: npm ci
+      - run: npm run bootstrap
+      - run: npm run test-browser-${{ matrix.module }}