diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..26f3464
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,35 @@
+# .coveragerc to control coverage.py
+[run]
+branch = False
+source = src
+
+omit =
+    */tests/*
+    */assets/*
+    */src/styles/*
+    */__init__.py
+
+disable_warnings = include-ignored
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code:
+    def __repr__
+    def __str__
+    def main
+    if self\.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+ignore_errors = True
+show_missing = True
diff --git a/.github/ci.yml b/.github/ci.yml
new file mode 100644
index 0000000..e5bd2f5
--- /dev/null
+++ b/.github/ci.yml
@@ -0,0 +1,31 @@
+name: Python package
+
+on:
+  pull_request:
+    branches: [ main ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ "3.10" ]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements_server.txt
+          pip install -r requirements_dev.txt
+      - name: Log in with sourcery
+        run:
+          sourcery login --token ${{ secrets.SOURCERY_TOKEN }}
+      - name: Run pre-commit checks
+        run: pre-commit run --all-files -a
+      - name: Run tests
+        run: pytest
diff --git a/pyproject.toml b/pyproject.toml
index 5c79b2e..ca4b6c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,7 @@ exclude = [".bzr",
     ".idea",
     ".streamlit",
 ]
+extend-exclude = ["tests", "assets", "src/styles"]
 per-file-ignores = { }
 
 # Allow unused variables when underscore-prefixed.
diff --git a/requirements_dev.txt b/requirements_dev.txt
new file mode 100644
index 0000000..09e499a
--- /dev/null
+++ b/requirements_dev.txt
@@ -0,0 +1,4 @@
+pytest==7.3.0
+ruff==0.0.261
+pre_commit==3.2.2
+pytest-cov==4.0.0
diff --git a/src/utils/helpers.py b/src/utils/helpers.py
index 3b60772..a6a41cd 100644
--- a/src/utils/helpers.py
+++ b/src/utils/helpers.py
@@ -20,5 +20,5 @@ def get_files_in_dir(path: Path) -> List[str]:
     return files
 
 
-def get_random_img(my_list: list) -> str:
-    return random.choice(my_list)
+def get_random_img(img_names: list[str]) -> str:
+    return random.choice(img_names)
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
new file mode 100644
index 0000000..d75ff19
--- /dev/null
+++ b/tests/test_helpers.py
@@ -0,0 +1,6 @@
+from src.utils.helpers import get_random_img
+
+
+def test_get_random_img():
+    img_names = ["img/1.png", "img/2.png", "img/3.png"]
+    assert get_random_img(img_names) in img_names