diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..52b7d07
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,24 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: mamba-org/setup-micromamba@v2
+      with:
+        generate-run-shell: true
+        environment-name: ci
+        create-args: >-
+          pillow
+          pymol-open-source
+          pyopengl
+          pytest
+          requests
+
+    - name: Test
+      run: python3 -m pytest -v
+      shell: micromamba-shell {0}
diff --git a/findseq.py b/findseq.py
index 07d73a5..0672c02 100644
--- a/findseq.py
+++ b/findseq.py
@@ -203,3 +203,12 @@ def checkParams(needle, haystack, selName, het, matchMode):
         print("Error: selName was not a string.")
         return False
     return True
+
+
+def test_findseq():
+    cmd.reinitialize()
+    cmd.fab('ACDEFG', 'm1')
+    cmd.fab('HIKLMN', 'm2')
+    cmd.do('findseq DEF, *, foundSeq')
+    assert cmd.count_atoms("foundSeq and m1") == 47
+    assert cmd.count_atoms("foundSeq and m2") == 0
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..7095195
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,9 @@
+[pytest]
+addopts =
+    --ignore-glob=_*
+    --ignore-glob=gendocs.py
+    --import-mode=importlib
+pythonpath = .
+python_files = *.py
+python_functions = test_*
+norecursedirs = examples files_for_examples modules plugins