Adds a guide for testing

docs/testing.md

@@ -0,0 +1,57 @@
+# Automated testing
+
+You can use the Supabase CLI to run automated tests. 
+
+## Testing your database
+
+After you have [created unit tests](https://supabase.com/docs/guides/database/testing) for your database, you can use the GitHub Action to run the tests.
+
+Inside your repository, create a new file inside the `.github/workflows` folder called `database-tests.yml`. Copy this snippet inside the file, and the action will run whenever a new PR is created:
+
+```yaml
+name: 'database-tests'
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: supabase/setup-cli@v1
+        with:
+          version: 1.11.4
+      - run: supabase db start
+      - run: supabase test db
+
+```
+
+## Testing your Edge Functions
+
+After you have [created unit tests](https://supabase.com/docs/guides/functions/unit-test) for your Edge Functions, you can use the GitHub Action to run the tests.
+
+Inside your repository, create a new file inside the `.github/workflows` folder called `functions-tests.yml`. Copy this snippet inside the file, and the action will run whenever a new PR is created:
+
+```yaml
+name: 'functions-tests'
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: supabase/setup-cli@v1
+        with:
+          version: 1.11.4
+      - run: supabase start
+      - run: supabase functions serve
+      - run: deno test --allow-all deno-test.ts --env-file .env.local
+
+```
+
+## More resources
+
+- Learn more about the [pgTAP extension](https://supabase.com/docs/guides/database/extensions/pgtap) for database testing.
+- Official pgTAP Documentation: [pgtap.org](https://pgtap.org/)