diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..1603642
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,40 @@
+name: tests
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  release:
+    types:
+      - published
+jobs:
+  tests:
+    strategy:
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install fish shell
+        uses: fish-actions/install-fish@v1.1.0
+      - name: Create syntactically valid fish shell function
+        run: |
+          cat << EOF >./valid-syntax.fish
+          function valid-syntax
+              echo "valid-syntax"
+          end
+          EOF
+      - if: github.event_name != 'pull_request'
+        name: Syntax check valid fish file using action from main branch
+        uses: fish-shop/syntax-check@main
+        with:
+          pattern: valid-syntax.fish
+      - if: github.event_name == 'pull_request'
+        name: Syntax check valid fish file using action from pull-request branch
+        uses: ./.
+        with:
+          pattern: valid-syntax.fish