Merge pull request #1 from kentaro-m/add-tests

Add unit tests

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: 'Test'
+
+on: push
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: setup node 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+
+      - name: install
+        run: npm install
+
+      - name: build
+        run: npm run build
+
+      - name: test
+        run: npm test

.gitignore

@@ -1,2 +1,3 @@
 node_modules
-lib/
+lib/
+coverage/