diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..2f9163b
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,25 @@
+name: Run Tests
+
+on: [pull_request, push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Set up Python 3.6
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.6
+    - name: Versions
+      run: |
+        python3 --version
+    - name: Checkout Current Repo
+      uses: actions/checkout@v1
+      with:
+        submodules: true
+    - name: Install pytest
+      run: pip install pytest
+    - name: Install locally
+      run: pip install .
+    - name: Run tests
+      run: pytest
diff --git a/adafruit_imageload/bmp/__init__.py b/adafruit_imageload/bmp/__init__.py
index 4eb9167..4136af8 100644
--- a/adafruit_imageload/bmp/__init__.py
+++ b/adafruit_imageload/bmp/__init__.py
@@ -52,10 +52,10 @@ def load(file, *, bitmap=None, palette=None):
     width = int.from_bytes(file.read(4), "little")
     try:
         height = int.from_bytes(file.read(4), "little")
-    except OverflowError:
+    except OverflowError as error:
         raise NotImplementedError(
             "Negative height BMP files are not supported on builds without longint"
-        )
+        ) from error
     file.seek(0x1C)  # Number of bits per pixel
     color_depth = int.from_bytes(file.read(2), "little")
     file.seek(0x1E)  # Compression type