add sample test to github actions

Author: divakaivan

.github/workflows/ci.yaml

@@ -24,3 +24,7 @@ jobs:
       - name: Run pre-commit checks
         run: |
           uv run pre-commit run --all-files
+
+      - name: Run pytest
+        run: |
+          uv run pytest

tests/test_project_config.py

@@ -0,0 +1,57 @@
+import pytest
+from pydantic import ValidationError
+from tempfile import NamedTemporaryFile
+from project_config import ProjectConfig
+
+@pytest.fixture
+def valid_yaml_config():
+    return """
+    gcs_raw_data_bucket_name: "my-bucket"
+    taxi_data_years: [2021, 2022]
+    taxi_data_months: [1, 2, 3]
+    taxi_type: "yellow"
+    """
+
+@pytest.fixture
+def invalid_yaml_config_missing_field():
+    return """
+    taxi_data_years: [2021, 2022]
+    taxi_data_months: [1, 2, 3]
+    taxi_type: "yellow"
+    """
+
+@pytest.fixture
+def invalid_yaml_config_wrong_type():
+    return """
+    gcs_raw_data_bucket_name: "my-bucket"
+    taxi_data_years: "2021, 2022"  # Should be a list[int], but it's a string
+    taxi_data_months: [1, 2, 3]
+    taxi_type: "yellow"
+    """
+
+def test_project_config_from_valid_yaml(valid_yaml_config):
+    with NamedTemporaryFile(mode="w", delete=False) as temp_file:
+        temp_file.write(valid_yaml_config)
+        temp_file.flush()
+        config = ProjectConfig.from_yaml(temp_file.name)
+    
+    assert config.gcs_raw_data_bucket_name == "my-bucket"
+    assert config.taxi_data_years == [2021, 2022]
+    assert config.taxi_data_months == [1, 2, 3]
+    assert config.taxi_type == "yellow"
+
+def test_project_config_missing_field(invalid_yaml_config_missing_field):
+    with NamedTemporaryFile(mode="w", delete=False) as temp_file:
+        temp_file.write(invalid_yaml_config_missing_field)
+        temp_file.flush()
+        
+        with pytest.raises(ValidationError):
+            ProjectConfig.from_yaml(temp_file.name)
+
+def test_project_config_wrong_type(invalid_yaml_config_wrong_type):
+    with NamedTemporaryFile(mode="w", delete=False) as temp_file:
+        temp_file.write(invalid_yaml_config_wrong_type)
+        temp_file.flush()
+
+        with pytest.raises(ValidationError):
+            ProjectConfig.from_yaml(temp_file.name)