diff --git a/app/test_split_integer.py b/app/test_split_integer.py
index ef3aa668a..d3a01d6c3 100644
--- a/app/test_split_integer.py
+++ b/app/test_split_integer.py
@@ -1,21 +1,26 @@
-from app.split_integer import split_integer
+from app import split_integer as split_integer_module
 
 
 def test_sum_of_the_parts_should_be_equal_to_value() -> None:
-    pass
+    assert sum(split_integer_module.split_integer(17, 4)) == 17
 
 
 def test_should_split_into_equal_parts_when_value_divisible_by_parts() -> None:
-    pass
+    assert split_integer_module.split_integer(12, 3) == [4, 4, 4]
 
 
 def test_should_return_part_equals_to_value_when_split_into_one_part() -> None:
-    pass
+    assert split_integer_module.split_integer(8, 1) == [8]
 
 
 def test_parts_should_be_sorted_when_they_are_not_equal() -> None:
-    pass
+    result = split_integer_module.split_integer(17, 4)
+
+    assert result == [4, 4, 4, 5]
+    assert len(result) == 4
+    assert result == sorted(result)
+    assert max(result) - min(result) <= 1
 
 
 def test_should_add_zeros_when_value_is_less_than_number_of_parts() -> None:
-    pass
+    assert split_integer_module.split_integer(3, 5) == [0, 0, 1, 1, 1]