$5\mathrm{.}37$ Lab training: Unit tests to evaluate your program

Auto$-$graded programming assignments may use a Unit test to test small parts of a program. Unlike a Compare output test, which evaluates your program's output for specific input values, a Unit test evaluates individual functions to determines if each function:

is named correctly and has the correct parameters and return type

calculates and returns the correct value $($or prints the correct output$)$

In Python labs, the line if main$\_\_\text{'}$: is used to separate the main code from the functions' code so that each function can be unit tested.

This example lab uses multiple unit tests to test the kilo$\_$to$\_$pounds $0$ function.

Complete a program that takes a weight in kilograms as input, converts the weight to pounds, and then outputs the weight in pounds. $1$ kilogram $=2\mathrm{.}204$ pounds $($lbs$).$

Ex: If the input is:

$1$

the

$22\mathrm{.}040000000000003lbs$

Note: Your program must define the function

def kilo$\_$to$\_$pounds$($kilos$)$

The program below has an error in the kilo$\_$to$\_$pounds $0$ function.

Try submitting the program for grading $($click "Submit mode", then "Submit for grading"$).$ Notice that the first two test cases fail, but the third test case passes. The first test case fails because the program outputs the result from the kilo$\_$to$\_$pounds $0$ function, which has an error. The second test case uses a Unit test to test the kilo$\_$to$\_$pounds$)$ function, which fails.

Change the kilo$\_$to$\_$pounds $0$ function to multiply the variable kilos by $2\mathrm{.}204,$ instead of dividing. The return statement should be: return $($kilos $*2\mathrm{.}204).$ Submit again. Now the test cases should all pass.

Note: A common error is to mistype a function name with the incorrect capitalization. Function names are case sensitive$,$ so if a lab program asks for a kilo$\_$to$\_$pounds$()$ function, a kilo$\_$To$\_$Pounds$()$ function that works for you in develop mode will result in a failed unit test $($the unit test will not be able to find kilo$\_$to$\_$pounds$()).$

$539078\mathrm{.}3140466\mathrm{.}93zqy7$

LAB ACTIVITY

$5\mathrm{.}37\mathrm{.}1$: Lab training: Unit tests to evaluate your program

$\frac{5}{10}$

main.py

Load default template...

$1$ def kilo$\_$to$\_$pounds$($kilos$)$:

# This statement intentionally has an error.