BUGFIX: 3 arg subtraction was not implemented

README.md

@@ -0,0 +1,11 @@
+# learn-git
+Hello Class!
+
+## Slam
+
+<details>
+<summary>
+<code>package.json</code>
+test
+</summary>
+</details>

src/calc.py

@@ -9,7 +9,7 @@ def add(a, b, third_operand = 0):
     """
     return a + b + third_operand
 
-def sub(a, b):
+def sub(a, b, third_arg =0):
     """
     Subtract some numbers
 

src/calc_test.py

@@ -17,6 +17,9 @@ def test_sub_2arg(self):
         # Make sure 4 - 3 = 1
         self.assertEqual(sub(4, 3), 1, 'subtracting three from four')
 
+    def test_sub_3arg(self):
+	self.assertEqual(sub(4, 3, 1), 0, 'subtracting three from four')
+
 
 if __name__ == '__main__':
     unittest.main()