diff --git a/task_1/accumulate_tests.py b/task_1/accumulate_tests.py
new file mode 100644
index 0000000..33781a9
--- /dev/null
+++ b/task_1/accumulate_tests.py
@@ -0,0 +1,83 @@
+import unittest
+from solution import *
+
+class TestAccumulateLeft(unittest.TestCase):
+    # tuple tests left
+    def test_if_tuple_of_one_element_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a + b, 64, (2,)), 66.0)
+
+    def test_if_tuple_of_one_hundred_elements_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a + b, 64, tuple(range(1, 501))), 125314.0)
+
+    def test_if_tuple_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a + b, 64, (2, 4, 8)), 78.0)
+
+    def test_if_tuple_is_the_collection_given_and_subtraction_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a - b, 64, (2, 4, 8)), 50.0)
+
+    def test_if_tuple_is_the_collection_given_and_multiplication_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a * b, 64, (2, 4, 8)), 4096.0)
+
+    def test_if_tuple_is_the_collection_given_and_division_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a / b, 64, (2, 4, 8)), 1.0)
+
+    # list tests left
+    def test_if_list_of_one_element_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a + b, 64, [2]), 66.0)
+
+    def test_if_list_of_one_hundred_elements_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a + b, 64, list(range(1, 501))), 125314.0)
+
+    def test_if_list_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a + b, 64, [2, 4, 8]), 78.0)
+
+    def test_if_list_is_the_collection_given_and_subtraction_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a - b, 64, [2, 4, 8]), 50.0)
+
+    def test_if_list_is_the_collection_given_and_multiplication_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a * b, 64, [2, 4, 8]), 4096.0)
+
+    def test_if_list_is_the_collection_given_and_division_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_left(lambda a, b: a / b, 64, [2, 4, 8]), 1.0)
+
+class TestAccumulateRight(unittest.TestCase):
+    # tuple tests right
+    def test_if_tuple_of_one_element_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a + b, 8, (2,)), 10.0)
+
+    def test_if_tuple_of_five_hundred_elements_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a + b, 8, tuple(range(1, 501))), 125258.0)
+
+    def test_if_tuple_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a + b, 8, (16, 32, 64)), 120.0)
+
+    def test_if_tuple_is_the_collection_given_and_subtraction_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a - b, 8, (16, 32, 64)), 40.0)
+
+    def test_if_tuple_is_the_collection_given_and_multiplication_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a * b, 8, (16, 32, 64)), 262144.0)
+
+    def test_if_tuple_is_the_collection_given_and_division_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a / b, 8, (16, 32, 64)), 4.0)
+
+    # list tests right
+    def test_if_list_of_one_element_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a + b, 8, [2]), 10.0)
+
+    def test_if_list_of_five_hundred_elements_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a + b, 8, list(range(1, 501))), 125258.0)
+
+    def test_if_list_is_the_collection_given_and_addition_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a + b, 8, [16, 32, 64]), 120.0)
+
+    def test_if_list_is_the_collection_given_and_subtraction_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a - b, 8, [16, 32, 64]), 40.0)
+
+    def test_if_list_is_the_collection_given_and_multiplication_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a * b, 8, [16, 32, 64]), 262144.0)
+
+    def test_if_list_is_the_collection_given_and_division_is_the_operation_then_return_correct_result(self):
+        self.assertEqual(accumulate_right(lambda a, b: a / b, 8, [16, 32, 64]), 4.0)
+
+if __name__ == "__main__":
+    unittest.main()
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