Fix null export when requests have no response; add test suite (#108)

Adds Jest test suite and CI workflow. Guards enrichWithResponse against
null/undefined from getResponse() (#69), and filters undefined parsed
entries from the export request list (#106).

Author: kellenmurphy

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+---
+
+name: Test
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+
+jobs:
+  test:
+    name: Run tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test

.gitignore

@@ -1 +1,2 @@
 lib/*.js
+node_modules/