diff --git a/src/utils.py b/src/utils.py
index faae9e3..12cdcae 100644
--- a/src/utils.py
+++ b/src/utils.py
@@ -41,7 +41,11 @@ def divide(a: float, b: float) -> float:
     Returns:
     float
     '''
-    return a / b
+
+    if b!=0: 
+        return a / b
+    else:
+        print("b shouldn't be zero")
 
 def modulo(a: int, b: int):
     '''
@@ -91,7 +95,8 @@ def return_hexadecimal(a: int) -> float:
     return hex(a)
 
 
-def return_random_number() -> int:
+def return_random_number(a: int, b:int, seed:int) -> int:
+
     '''
     ...
 
@@ -103,4 +108,5 @@ def return_random_number() -> int:
     float
     '''
 
-    return np.random.randint(0, 100)
\ No newline at end of file
+    np.random.seed(seed)
+    return np.random.randint(a, b)
diff --git a/tests/Test_return_random_number.py b/tests/Test_return_random_number.py
new file mode 100644
index 0000000..b6ac062
--- /dev/null
+++ b/tests/Test_return_random_number.py
@@ -0,0 +1,7 @@
+from src.utils import return_random_number
+
+try:
+  return_random_number(0,200, 45)
+  print("The return_random_number function works")
+except:
+  print("We have an issue with return_random_number function")
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..fb01633
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1 @@
+from utils import sum, multiply, divide
\ No newline at end of file
diff --git a/tests/test_hexadecimal.py b/tests/test_hexadecimal.py
new file mode 100644
index 0000000..ace9728
--- /dev/null
+++ b/tests/test_hexadecimal.py
@@ -0,0 +1,6 @@
+from src.utils import return_hexadecimal
+def test_hexadecimal():
+    a = 2
+    b = 3
+
+    assert return_hexadecimal(a) == hex(a)