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x = 4
ex: if x>2
x.startwith('5') # This will produce failure
else:
print ('hello')
fault is problem in code, the root cause of problem
unit test: lowest level of testing
ex:
def is_odd(inputnum):
if inputnum%2 == 0:
return False
else:
return True
what if the input is '7'? A lot of mumbo jumbo error stuff. This is NOT failing gracefully
Contractual Design: Certain expectations between caller and calle. There is a contract between the function and the method to call function. is_odd will return True/False and the caller will input an integer.
invariant - remains True throughout the loop.
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