For each function listed below $($invert$,$ favorite$\_$color, count, alphabetize, update$\_$attendance$),$ you are to define at least $3$x unit test functions. Remember that a unit test function starts with test$\_.$

The $3$ unit tests should consist of:

Two use cases: expected use cases of a function

One edge case: unexpected use cases of a function

Include descriptive function names and docstrings, so that it captures what is being tested.

def invert$($dictionary$)$:

$"""$Invert Function."""

inverted$\_$dict $=\{\}$

for key, value in dictionary.items$()$:

if value in inverted$\_$dict:

raise KeyError$("$Duplicate value encountered while inverting dictionary"$)$

inverted$\_$dict$[$value$]=$ key

return inverted$\_$dict

def favorite$\_$color$($colors$)$:

$"""$Favorite Color Function."""

color$\_$count $=\{\}$

for color in colors.values$()$:

color$\_$count$[$color$]=$ color$\_$count.get$($color$,0)+1$

max$\_$count $=$ max$($color$\_$count.values$())$

for name, color in colors.items$()$:

if color$\_$count$[$color$]==$ max$\_$count:

return color

def count$($lst$)$:

$"""$Count Function."""

count$\_$dict $=\{\}$

for item in lst:

if item in count$\_$dict:

count$\_$dict$[$item$]+=1$

else:

count$\_$dict$[$item$]=1$

return count$\_$dict

def alphabetizer$($words$)$:

$"""$Alphabetizer Function."""

alphabet$\_$dict $=\{\}$

for word in words:

first$\_$letter $=$ word$[0].$lower$()$

if first$\_$letter in alphabet$\_$dict:

alphabet$\_$dict$[$first$\_$letter$].$append$($word$)$

else:

alphabet$\_$dict$[$first$\_$letter$]=[$word$]$

return alphabet$\_$dict

def update$\_$attendance$($attendance$\_$log$,$ day, student$)$:

$"""$Update Attendance Function."""

if day in attendance$\_$log:

attendance$\_$log$[$day$].$append$($student$)$

else:

attendance$\_$log$[$day$]=[$student$]$