diff --git a/tests/unit/lib/test_datachain_bootstrap.py b/tests/unit/lib/test_datachain_bootstrap.py
index 4ecbdaa3a..7ecd27f86 100644
--- a/tests/unit/lib/test_datachain_bootstrap.py
+++ b/tests/unit/lib/test_datachain_bootstrap.py
@@ -4,27 +4,26 @@
 from datachain.lib.udf import Mapper
 
 
-class MyMapper(Mapper):
-    DEFAULT_VALUE = 84
-    BOOTSTRAP_VALUE = 1452
-    TEARDOWN_VALUE = 98763
-
-    def __init__(self):
-        super().__init__()
-        self.value = MyMapper.DEFAULT_VALUE
-        self._had_teardown = False
+def test_udf():
+    class MyMapper(Mapper):
+        DEFAULT_VALUE = 84
+        BOOTSTRAP_VALUE = 1452
+        TEARDOWN_VALUE = 98763
 
-    def process(self, *args) -> int:
-        return self.value
+        def __init__(self):
+            super().__init__()
+            self.value = MyMapper.DEFAULT_VALUE
+            self._had_teardown = False
 
-    def setup(self):
-        self.value = MyMapper.BOOTSTRAP_VALUE
+        def process(self, *args) -> int:
+            return self.value
 
-    def teardown(self):
-        self.value = MyMapper.TEARDOWN_VALUE
+        def setup(self):
+            self.value = MyMapper.BOOTSTRAP_VALUE
 
+        def teardown(self):
+            self.value = MyMapper.TEARDOWN_VALUE
 
-def test_udf():
     vals = ["a", "b", "c", "d", "e", "f"]
     chain = DataChain.from_values(key=vals)
 
@@ -35,10 +34,30 @@ def test_udf():
     assert udf.value == MyMapper.TEARDOWN_VALUE
 
 
-@pytest.mark.skip(reason="Skip until tests module will be importer for unit-tests")
-def test_udf_parallel():
+@pytest.mark.xdist_group(name="tmpfile")
+def test_udf_parallel(test_session_tmpfile):
     vals = ["a", "b", "c", "d", "e", "f"]
-    chain = DataChain.from_values(key=vals)
+
+    class MyMapper(Mapper):
+        DEFAULT_VALUE = 84
+        BOOTSTRAP_VALUE = 1452
+        TEARDOWN_VALUE = 98763
+
+        def __init__(self):
+            super().__init__()
+            self.value = MyMapper.DEFAULT_VALUE
+            self._had_teardown = False
+
+        def process(self, *args) -> int:
+            return self.value
+
+        def setup(self):
+            self.value = MyMapper.BOOTSTRAP_VALUE
+
+        def teardown(self):
+            self.value = MyMapper.TEARDOWN_VALUE
+
+    chain = DataChain.from_values(key=vals, session=test_session_tmpfile)
 
     res = list(chain.settings(parallel=4).map(res=MyMapper()).collect("res"))