diff --git a/.github/workflows/run-unit-tests.yaml b/.github/workflows/run-unit-tests.yaml
new file mode 100644
index 0000000..ce4ff39
--- /dev/null
+++ b/.github/workflows/run-unit-tests.yaml
@@ -0,0 +1,56 @@
+---
+name: Run Unit Tests
+
+on:
+  pull_request:
+    branches: [ main ]
+    types: [opened, synchronize, reopened, ready_for_review]
+
+  push:
+    branches: [ main ]
+
+# Cancel older runs for the same PR to save minutes
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    if: ${{ github.event.pull_request.draft == false || github.event_name == 'push' }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.12']
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+
+      - name: Install package and dependencies
+        run: |
+          python -m pip install --upgrade pip
+           pip install . --group test
+
+      - name: Register hf-hydrodata credentials as a public user
+        env:
+          TEST_EMAIL_PUBLIC: ${{ secrets.TEST_EMAIL_PUBLIC }}
+          TEST_PIN_PUBLIC: ${{ secrets.TEST_PIN_PUBLIC }}
+        run: |
+          python utilities/set_test_credentials.py
+
+      - name: Run unit tests
+        run: |
+          pytest --verbose
diff --git a/pyproject.toml b/pyproject.toml
index ca4a381..8384018 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "cssi_evaluation"
-version = "0.1.4"
+version = "0.1.5"
 description = "Model evaluation functions for the CSSI project"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {file = "LICENSE"}
diff --git a/src/cssi_evaluation/utils.py b/src/cssi_evaluation/utils.py
index a20bfc4..5637b04 100644
--- a/src/cssi_evaluation/utils.py
+++ b/src/cssi_evaluation/utils.py
@@ -185,6 +185,9 @@ def initialize_metrics_df(obs_metadata_df, metrics_list):
         ["site_id", "site_name", "latitude", "longitude", "domain_i", "domain_j"]
     ].copy()
     for m in metrics_list:
-        metrics_df[f"{m}"] = np.nan
+        if m == "condon":
+            metrics_df[f"{m}"] = ""
+        else:
+            metrics_df[f"{m}"] = np.nan
 
     return metrics_df
diff --git a/tests/cssi_evaluation/test_model_evaluation.py b/tests/cssi_evaluation/test_model_evaluation.py
index b6e42d8..f9f61db 100644
--- a/tests/cssi_evaluation/test_model_evaluation.py
+++ b/tests/cssi_evaluation/test_model_evaluation.py
@@ -27,7 +27,7 @@ def test_get_observations():
     obs_metadata_df, obs_data_df = model_evaluation.get_observations(
         mask, ij_bounds, grid, start_date, end_date, variable, temporal_resolution
     )
-    assert obs_metadata_df.shape == (14, 32)
+    assert obs_metadata_df.shape[0] == 14
     assert obs_data_df.shape == (48, 15)
     assert "01447500" in obs_data_df.columns
 
@@ -49,7 +49,7 @@ def test_get_observations_nan_filter_sites_removed():
         mask, ij_bounds, grid, start_date, end_date, variable, temporal_resolution
     )
 
-    assert obs_metadata_df.shape == (7, 32)
+    assert obs_metadata_df.shape[0] == 7
     assert obs_data_df.shape == (5, 8)
     assert "01209500" not in obs_data_df.columns
 
@@ -78,7 +78,7 @@ def test_get_observations_nan_filter_sites_included():
         remove_sites_no_data=False,
     )
 
-    assert obs_metadata_df.shape == (8, 32)
+    assert obs_metadata_df.shape[0] == 8
     assert obs_data_df.shape == (5, 9)
     assert "01209500" in obs_data_df.columns
 
diff --git a/utilities/set_test_credentials.py b/utilities/set_test_credentials.py
new file mode 100644
index 0000000..df38e29
--- /dev/null
+++ b/utilities/set_test_credentials.py
@@ -0,0 +1,22 @@
+"""Set user credentials for hf_hydrodata package."""
+
+# pylint: disable=C0413
+
+import sys
+import os
+
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../src")))
+import hf_hydrodata as hf
+
+
+def main():
+    """Use environment variable secrets to set hf_hydrodata credentials
+    for GitHub Actions testing."""
+    test_email = str(os.environ["TEST_EMAIL_PUBLIC"])
+    test_pin = str(os.environ["TEST_PIN_PUBLIC"])
+
+    hf.register_api_pin(test_email, test_pin)
+
+
+if __name__ == "__main__":
+    main()