* Add spark tests

* Add pandas optional dependency

Author: mkopec87

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
           if [ "${{ matrix.numpy_version }}" = "numpy<2" ]; then
             pip install ".[test,test_numpy_pre2]"
           else
-            pip install ".[test]"          
+            pip install ".[test,spark]"          
           fi
 
       - name: Test with pytest

pyproject.toml

@@ -36,6 +36,12 @@ classifiers = ["Development Status :: 5 - Production/Stable",
 dynamic = ["version"]
 
 [project.optional-dependencies]
+pandas = [
+    "pandas"
+]
+spark = [
+    "pyspark>=3.1; python_version <= '3.11'",
+]
 test = [
     "ipykernel>=5.1.3",
     "jupyter_client>=5.2.3",