1 files changed, 28 insertions, 0 deletions
diff --git a/testing/mozharness/test/test_base_parallel.py b/testing/mozharness/test/test_base_parallel.py
new file mode 100644
index 0000000000..272d84484d
--- /dev/null
+++ b/testing/mozharness/test/test_base_parallel.py
@@ -0,0 +1,28 @@
+import unittest
+
+from mozharness.base.parallel import ChunkingMixin
+
+
+class TestChunkingMixin(unittest.TestCase):
+    def setUp(self):
+        self.c = ChunkingMixin()
+
+    def test_one_chunk(self):
+        self.assertEqual(self.c.query_chunked_list([1, 3, 2], 1, 1), [1, 3, 2])
+
+    def test_sorted(self):
+        self.assertEqual(
+            self.c.query_chunked_list([1, 3, 2], 1, 1, sort=True), [1, 2, 3]
+        )
+
+    def test_first_chunk(self):
+        self.assertEqual(self.c.query_chunked_list([4, 5, 4, 3], 1, 2), [4, 5])
+
+    def test_last_chunk(self):
+        self.assertEqual(self.c.query_chunked_list([1, 4, 5, 7, 5, 6], 3, 3), [5, 6])
+
+    def test_not_evenly_divisble(self):
+        thing = [1, 3, 6, 4, 3, 2, 6]
+        self.assertEqual(self.c.query_chunked_list(thing, 1, 3), [1, 3, 6])
+        self.assertEqual(self.c.query_chunked_list(thing, 2, 3), [4, 3])
+        self.assertEqual(self.c.query_chunked_list(thing, 3, 3), [2, 6])