diff --git a/.github/workflows/emacs-test.yml b/.github/workflows/emacs-test.yml
new file mode 100644
index 0000000..0c3f08c
--- /dev/null
+++ b/.github/workflows/emacs-test.yml
@@ -0,0 +1,23 @@
+name: Emacs Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install Emacs
+        run: sudo apt-get install emacs
+
+      - name: Run tests
+        run: emacs --batch -l ert -l tzc-tests.el -f ert-run-tests-batch-and-exit
diff --git a/tzc-tests.el b/tzc-tests.el
new file mode 100644
index 0000000..f28f1b8
--- /dev/null
+++ b/tzc-tests.el
@@ -0,0 +1,9 @@
+(require 'ert)
+(load-file "tzc.el")
+
+(ert-deftest tzc-test-get-offset-lisbon ()
+  (should (equal (mapcar (lambda (date) (tzc--get-offset "Europe/Lisbon" date)) (list "2024-03-25" "2024-04-05")) (list "+0000" "+0100"))))
+
+(ert-deftest tzc-test-get-offset-los-angeles ()
+  (should (equal (mapcar (lambda (date) (tzc--get-offset "America/Los_Angeles" date)) (list "2024-02-25" "2024-03-15")) (list "-0800" "-0700"))))
+