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CSE 2221 Quiz 4
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Exam of 12 pages for the course CSE 2221 at CSE 2221 (CSE 2221 Quiz 4)
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CSE 2221 Quiz 4How important is testing in programming? - - very important it is expensive
and often takes 30-40% of the total project effort, for life-critical systems it
often is much higher percentage, software can have millions of lines of code,
so testing is important to prevent bugs from being released in the end-
product
- Best practice for testing? - - test individual units or components of
software at a time (such as one class, or one method at a time)
- unit testing - - test individual units or pieces of code for a system (such as
a method or class)
- Integration testing - - Testing what happens when multiple components
are put together into a larger system
- UUT - - unit under test
- system testing - - Testing a whole end-user system
- What does it mean for a program unit (such as a method) to be correct? - -
It means it does what its supposted to do
It doesn't do what it is not supposed to do
- Legal input is also known as? - - requires clause
- allowable result is? - - the same as ensures clause
- The method body is considered correct if? - - if the actual behaviors of the
method is a subset of the allowed behaviors of the method body.
For example refer back to aFactor(int n) method, it will return an int that is a
factor of n, if n = 12 it could be 1, 3, 4 but not 5, so if the method is
programmed to always return 1 no matter the value of n it would always be
correct as everything is a factor of 1
- When we write class C implements I what do we care about? - - ensuring
the the method body created in C follows the contract written in I, remember
that the java compiler doesn't do this, we must ensure that C follow the
contract for each method body
- What is testing? - - a technique for trying to refute the claim that a
method body is correct for the method contract
, NOTE: the goal of testing is to show that the method does not correctly
implement the contract, you are NOT trying to prove or show that the
method is correctly implemented
- Design and coding are thought of as ___________ activities
Testing is a _____________ activity - - creating; destructive
- Should the same person both do testing and coding? - - no, people don't
like finding out they made mistakes
- Goal of debugging - - given some source code that has a defect, find the
defect and repair it
- testing vs debugging - - testing- you try to "break" the code, find defects
debugging, you have a defect and you try and repair it
- Test plan / test fixture? - - set of test cases for a give unit (like a method
or class)
In JUnit testing this is a public class which one method per test case
- Test case - - each input value and corresponding allowed/expected result
for example if you have a method that add 2 to a number passed in as an
argument, the input of 2 should have an output of 4
In JUnit testing one method is a test case
- Program testing can be used to show the __________________ of bugs, but
never to show their ________________ - - presence; absence
- What type of cases should you test your code against? - - boundary cases
routine cases
challenging cases
- boundary cases - - "smallest", "largest" values and special values based
on the contract
- routine cases - - normal cases your program/ method would be used on
- challenging cases - - ones that if you were writing the code might be
difficult or error-prone
- Why are test cases that don't meet the requires clause useless? - - you
don't know what the output could be since it doesn't have to follow the
ensures clause
- What is the primitive type of testing? - - using main as a command
interpreter, where the user (tester) provides input and observes the actual
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