Check for duplicate lesson and consult

[marcusjhang]

PR for issue #193

[codecov]

Codecov Report

Attention: Patch coverage is 89.51049% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../address/model/consultation/UniqueConsultList.java	91.30%	2 Missing and 2 partials ⚠️
...a/seedu/address/model/lesson/UniqueLessonList.java	91.30%	2 Missing and 2 partials ⚠️
...c/main/java/seedu/address/model/lesson/Lesson.java	40.00%	1 Missing and 2 partials ⚠️
...seedu/address/model/consultation/Consultation.java	66.66%	1 Missing and 1 partial ⚠️
...c/main/java/seedu/address/model/datetime/Date.java	0.00%	0 Missing and 1 partial ⚠️
...c/main/java/seedu/address/model/datetime/Time.java	0.00%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...logic/commands/consultation/AddConsultCommand.java	100.00% <100.00%> (ø)	9.00 <0.00> (+1.00)
...ddress/logic/commands/lesson/AddLessonCommand.java	76.47% <100.00%> (+3.13%)	7.00 <0.00> (ø)
src/main/java/seedu/address/model/AddressBook.java	92.39% <100.00%> (+1.04%)	32.00 <13.00> (-5.00)	⬆️
...el/lesson/exceptions/DuplicateLessonException.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...c/main/java/seedu/address/model/datetime/Date.java	91.66% <0.00%> (ø)	12.00 <1.00> (ø)
...c/main/java/seedu/address/model/datetime/Time.java	91.66% <0.00%> (ø)	12.00 <1.00> (ø)
...seedu/address/model/consultation/Consultation.java	93.33% <66.66%> (-4.11%)	25.00 <4.00> (+4.00)	⬇️
...c/main/java/seedu/address/model/lesson/Lesson.java	94.44% <40.00%> (-4.07%)	30.00 <3.00> (+3.00)	⬇️
.../address/model/consultation/UniqueConsultList.java	91.30% <91.30%> (ø)	22.00 <22.00> (?)
...a/seedu/address/model/lesson/UniqueLessonList.java	91.30% <91.30%> (ø)	22.00 <22.00> (?)

... and 2 files with indirect coverage changes

[notnotmax]

I think you might want to edit the PR description to link it to issue #193.

[notnotmax]

Code looks good, but I think it will be safer to have testcases testing that trying to add duplicates does indeed throw an exception.

completed