HyukjinKwon commented on a change in pull request #32867:
URL: https://github.com/apache/spark/pull/32867#discussion_r652290250



##########
File path: dev/sparktestsupport/modules.py
##########
@@ -19,10 +19,28 @@
 import itertools
 import os
 import re
+import glob
+
+from sparktestsupport import SPARK_HOME
 
 all_modules = []
 
 
+def _discover_python_unittests(paths):
+    if not paths:
+        return set([])
+    tests = set([])
+    pyspark_path = os.path.join(SPARK_HOME, "python")
+    for path in paths:
+        # Discover the test*.py in every path
+        files = glob.glob(os.path.join(pyspark_path, path, "test_*.py"))
+        for f in files:
+            # Convert 'pyspark_path/pyspark/tests/test_abc.py' to 
'pyspark.tests.test_abc'
+            file2module = os.path.relpath(f, pyspark_path)[:-3].replace("/", 
".")

Review comment:
       Hmm .. I like the idea but the implementation is slightly flaky ... 
e.g.) I wonder if we can import pyspark and go through the sub packages 
manually instead of going through the files ..




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