diff --git a/homework_1/sample_test.py b/homework_1/sample_test.py
index 294fdf2..eb9b882 100644
--- a/homework_1/sample_test.py
+++ b/homework_1/sample_test.py
@@ -42,7 +42,9 @@ def test_strong_relation(self):
         B = ("B", [("p", 4), ("q", 3)])
         C = ("C", [("p", 3)])
         self.assertEqual(solution.strong_relation([A, B, C]), [
-                         (A, []), (B, ['A']), (C, ['A', 'B'])])
+                         (("A", [("p", 5), ("q", 3)]), []), 
+                         (("B", [("p", 4), ("q", 3)]), ['A']), 
+                         (("C", [("p", 3)]), ['A', 'B'])])
 
     def test_max_notes(self):
         P = [[1, 2, 3], [2, 2, 2], [9, 7, 3]]
diff --git a/homework_1/test_hw_tasks.py b/homework_1/test_hw_tasks.py
new file mode 100644
index 0000000..8aa38aa
--- /dev/null
+++ b/homework_1/test_hw_tasks.py
@@ -0,0 +1,132 @@
+from solution import group_by_f
+
+from solution import has_same_ingredients
+from solution import is_stronger, least_stronger, strong_relation
+
+from solution import max_notes, leading
+
+import unittest
+
+
+class TestGroupByF(unittest.TestCase):
+    def test_function_with_lambda_function(self):
+        true_result = group_by_f(lambda a: a % 2 == 0, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
+        expected_result = {False: [1, 3, 5, 7, 9], True: [2, 4, 6, 8, 10]}
+
+        self.assertEqual(true_result, expected_result)
+
+    def test_function_with_standard_len_function(self):
+        true_result = group_by_f(len, [[1], [7, 8], [1, 2, 3, 4], [4], ["random", "words"]])
+        expected_result = {1: [[1], [4]], 2: [[7, 8], ['random', 'words']], 4: [[1, 2, 3, 4]]}
+
+        self.assertEqual(true_result, expected_result)
+
+class TestHasSameIngredients(unittest.TestCase):
+    def test_function_when_result_must_be_true(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+
+        self.assertTrue(has_same_ingredients(medicine1, medicine2))
+
+    def test_function_when_result_must_be_true_with_swapped_names(self):
+        medicine1 = ("medicine1", [("q", 5), ("p", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+
+        self.assertTrue(has_same_ingredients(medicine1, medicine2))
+
+    def test_function_when_result_must_be_false(self):
+        medicine1 = ("medicine1", [("p", 5)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+
+        self.assertTrue(has_same_ingredients(medicine1, medicine2))
+
+
+class TestIsStronger(unittest.TestCase):
+    def test_function_when_medicines_are_equal_strength(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 4)])
+
+        self.assertFalse(is_stronger(medicine1, medicine2))
+
+    def test_function_when_first_medicine_is_stronger_than_the_second(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+
+        self.assertTrue(is_stronger(medicine1, medicine2))
+
+    def test_function_when_first_medicine_is_not_stronger_than_the_second(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+
+        self.assertFalse(is_stronger(medicine2, medicine1))
+
+
+class TestLeastStronger(unittest.TestCase):
+    def test_function_when_medicine_is_stronger_than_return_it(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+        medicine3 = ("medicine3", [("p", 3)])
+        medicine4 = ("medicine4", [("p", 4.5), ("q", 3), ("r", 1)])
+
+        expected_result = ("medicine4", [("p", 4.5), ("q", 3), ("r", 1)])
+
+        self.assertEqual(least_stronger(medicine2, [medicine1, medicine3, medicine4]), expected_result)
+
+    def test_function_when_no_medicine_is_stronger_than_return_empty_list(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+        medicine3 = ("medicine3", [("p", 3)])
+        medicine4 = ("medicine4", [("p", 4.5), ("q", 3), ("r", 1)])
+
+        expected_result = []
+
+        self.assertEqual(least_stronger(medicine1, [medicine2, medicine3, medicine4]), expected_result)
+
+
+class TestStrongRelation(unittest.TestCase):
+    def test_function_when_result_must_be_list_of_tuples(self):
+        medicine1 = ("medicine1", [("p", 5), ("q", 3)])
+        medicine2 = ("medicine2", [("p", 4), ("q", 3)])
+        medicine3 = ("medicine3", [("p", 3)])
+
+        expected_result = [(('medicine1', [('p', 5), ('q', 3)]), []), (('medicine2', [('p', 4), ('q', 3)]), ['medicine1']), (('medicine3', [('p', 3)]), ['medicine1', 'medicine2'])]
+
+        self.assertEqual(strong_relation([medicine1, medicine2, medicine3]), expected_result)
+
+
+class TestMaxNotes(unittest.TestCase):
+    def test_function_when_result_must_be_the_max_notes(self):
+        true_result = max_notes([[1, 2, 3], [2, 2, 2], [9, 7, 3]])
+        expected_result = 19
+
+        self.assertEqual(true_result, expected_result)
+
+    def test_function_when_result_must_be_zero(self):
+        true_result = max_notes([])
+        expected_result = 0
+
+        self.assertEqual(true_result, expected_result)
+
+    def test_function_when_max_notes_are_equal_then_return_result(self):
+        true_result = max_notes([[1, 2, 3], [2, 2, 2]])
+        expected_result = 6
+
+        self.assertEqual(true_result, expected_result)
+
+
+class TestLeading(unittest.TestCase):
+    def test_function_when_result_must_be_the_leading_note(self):
+        true_result = leading([[1, 10, 2], [2, 2, 2], [9, 7, 3]])
+        expected_result = 2
+
+        self.assertEqual(true_result, expected_result)
+
+    def test_function_when_result_must_be_the_first_leading_note(self):
+        true_result = leading([[1, 2, 3], [2, 2, 2], [9, 7, 3]])
+        expected_result = 2
+
+        self.assertEqual(true_result, expected_result)
+
+
+if __name__ == "__main__":
+    unittest.main()