fix: add a flaky test

Author: thomasrockhu-codecov

app/test_calculator.py

@@ -1,6 +1,10 @@
+import random
 from .calculator import Calculator
 
 
+def test_flaky():
+ assert random.random() <= 0.8
+
 def test_add():
  assert Calculator.add(1, 2) == 3.0
  assert Calculator.add(1.0, 2.0) == 3.0