chore: add unit test coverage and enforcement (#522)

Author: ssvegaraju

.github/workflows/code-coverage.yml

@@ -0,0 +1,17 @@
+#
+#  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#  SPDX-License-Identifier: Apache-2.0
+#
+
+name: Code Coverage Report
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2 # Check out your repository
+    - run: yarn install # Install dependencies
+    - run: yarn test --coverage # Run test
+    - run: bash <(curl -s https://codecov.io/bash) # Upload to Codecov

codecov.yml

@@ -0,0 +1,19 @@
+coverage:
+  round: down
+  precision: 2
+  range: '90...100'
+  status:
+    project:
+      default:
+        # basic
+        target: 90%
+        threshold: 0.1%
+        # advanced settings
+        if_ci_failed: error #success, failure, error, ignore
+        informational: false
+        only_pulls: false
+
+comment:
+  layout: 'reach,diff,flags,files,footer'
+  behavior: default
+  require_changes: no

package.json

@@ -101,6 +101,7 @@
       "ts",
       "js"
     ],
+    "collectCoverage": true,
     "coverageReporters": [
       "text",
       "html"