diff --git a/app/test_split_integer.py b/app/test_split_integer.py
index ef3aa668a..c6b6d09d7 100644
--- a/app/test_split_integer.py
+++ b/app/test_split_integer.py
@@ -2,20 +2,61 @@
 
 
 def test_sum_of_the_parts_should_be_equal_to_value() -> None:
-    pass
+    assert sum(split_integer(8, 1)) == 8
+    assert sum(split_integer(6, 2)) == 6
+    assert sum(split_integer(17, 4)) == 17
+    assert sum(split_integer(32, 6)) == 32
+    assert sum(split_integer(100, 7)) == 100
+    assert sum(split_integer(1, 5)) == 1
+    assert sum(split_integer(2, 5)) == 2
 
 
-def test_should_split_into_equal_parts_when_value_divisible_by_parts() -> None:
-    pass
+def test_should_split_into_equal_parts_when_value_divisible_by_parts() -> (
+    None
+):
+    assert split_integer(6, 2) == [3, 3]
+    assert split_integer(8, 2) == [4, 4]
+    assert split_integer(12, 3) == [4, 4, 4]
+    assert split_integer(20, 4) == [5, 5, 5, 5]
+    assert split_integer(100, 5) == [20, 20, 20, 20, 20]
 
 
-def test_should_return_part_equals_to_value_when_split_into_one_part() -> None:
-    pass
+def test_should_return_part_equals_to_value_when_split_into_one_part() -> (
+    None
+):
+    assert split_integer(8, 1) == [8]
+    assert split_integer(100, 1) == [100]
+    assert split_integer(1, 1) == [1]
 
 
 def test_parts_should_be_sorted_when_they_are_not_equal() -> None:
-    pass
+    assert split_integer(17, 4) == sorted(split_integer(17, 4))
+    assert max(split_integer(17, 4)) - min(split_integer(17, 4)) <= 1
+    assert split_integer(32, 6) == sorted(split_integer(32, 6))
+    assert max(split_integer(32, 6)) - min(split_integer(32, 6)) <= 1
+    assert split_integer(10, 3) == sorted(split_integer(10, 3))
+    assert max(split_integer(10, 3)) - min(split_integer(10, 3)) <= 1
+    assert split_integer(7, 3) == sorted(split_integer(7, 3))
+    assert max(split_integer(7, 3)) - min(split_integer(7, 3)) <= 1
+    assert split_integer(15, 4) == sorted(split_integer(15, 4))
+    assert max(split_integer(15, 4)) - min(split_integer(15, 4)) <= 1
+    assert split_integer(25, 5) == sorted(split_integer(25, 5))
+    assert max(split_integer(25, 5)) - min(split_integer(25, 5)) <= 1
 
 
 def test_should_add_zeros_when_value_is_less_than_number_of_parts() -> None:
-    pass
+    assert split_integer(1, 5) == sorted(split_integer(1, 5))
+    assert max(split_integer(1, 5)) - min(split_integer(1, 5)) <= 1
+    assert sum(split_integer(1, 5)) == 1
+    assert split_integer(2, 5) == sorted(split_integer(2, 5))
+    assert max(split_integer(2, 5)) - min(split_integer(2, 5)) <= 1
+    assert sum(split_integer(2, 5)) == 2
+    assert split_integer(3, 5) == sorted(split_integer(3, 5))
+    assert max(split_integer(3, 5)) - min(split_integer(3, 5)) <= 1
+    assert sum(split_integer(3, 5)) == 3
+    assert split_integer(4, 5) == sorted(split_integer(4, 5))
+    assert max(split_integer(4, 5)) - min(split_integer(4, 5)) <= 1
+    assert sum(split_integer(4, 5)) == 4
+    assert split_integer(1, 10) == sorted(split_integer(1, 10))
+    assert max(split_integer(1, 10)) - min(split_integer(1, 10)) <= 1
+    assert sum(split_integer(1, 10)) == 1