Add Test Cases for get$\_$src

When designing test cases for stet$\_$sre, look very closely at the precondition. It says that the string must be a

valid response from the web service. This is an extremely restrictive precondition, so it limits the possible test

cases significantly. However, notice the comment about colons in the specification. That will be important for

your test cases.

Check the Test cases

You may run this test multiple times.

def get$\_$afe $($jasen$)$ :

s$.$t$.$

Given a JSON stefing provided by the neb servied, Ehis function futurad the atring

if ehe jat is

On the etier hand $44$ the jagn is

then this function returat the e$-$pty atring$-$

The atb server does NOT specify the number of spaces after the colers. The JSON

is alae valid $($in abditien to the exaples abowe$).$

Precondition: jaon a string provided by the web service $($only enforce the type$)$