please help ne answer this

$1.$ Write unit tests for the following methods of the StringUtils class in the Apache Commons Lang library. More detail of the class can be found in its documentation

write a test method for each of the following and test the target method four different ways $(\backslash (10*2=20\backslash )$ Marks$)$

a$.$ join$($List list, String separator, int startIndex, int endIndex$)$

b$.$ lastIndexOf$($CharSequence seq, int searchChar$)$

c$.$ leftPad$($String str$,$ int size, char padChar$)$

d$.$ repeat$($String str$,$ int repeat$)$

c$.$ reverse$($String str$)$

f$.$ split$($String str$,$ char separatorChar$)$

g$.$ startsWith$($CharSequence str$,$ CharSequence prefix$)$

h$.$ substring$($String str$,$ int start$)$

i$.\backslash (\backslash$quad $\backslash )$ trim$($String str$)$

j$.$ upperCase$($String str$)$

$2.$ Create a test suite to bundle all the above test cases to run them together $(5$ Marks$)$ The evaluation will consider the effectiveness of your test cases.

Submission Requirements:

Create a Java project that include all the required dependencies and source code for performing unit tests. Export the project as a zip file and then upload on the course website