docs: add a unittest benchmark example

Author: art049

tests/benchmarks/test_bench_unittest.py

@@ -0,0 +1,20 @@
+import unittest
+
+import pytest
+
+
+class MyBenchmark(unittest.TestCase):
+    def setUp(self):
+        # Initialize the benchmark environment
+        self.input = (
+            "Lorem Ipsum is simply dummy text of the printing and typesetting industry."
+            * 100
+        )
+
+    @pytest.mark.benchmark
+    def test_bench_hash(self):
+        hash(self.input)
+
+    def tearDown(self):
+        # Clean up the benchmark environment
+        pass