updated test_operations with new test cases

src/math_operations.py

@@ -2,4 +2,7 @@ def add(a,b):
     return a+b
 
 def sub(a,b):
-    return a-b 
+    return a-b 
+
+def mul(a, b):
+    return a * b

tests/test_operation.py

@@ -1,4 +1,4 @@
-from src.math_operations import add,sub
+from src.math_operations import add,sub,mul
 
 def test_add():
     assert add(2,3)==5
@@ -8,4 +8,10 @@ def test_sub():
     assert sub(5,3)==2
     assert sub(4,3)==1
     assert sub(3,3)==0
-    assert sub(2,3)==-1
+    assert sub(2,3)==-1
+
+def test_mul():
+    assert mul(1, 0) == 0 
+    assert mul(0, 1) == 0 
+    assert mul(1, 1) == 1
+    assert mul(100, 100) == 10000