Zijian/implement find for status

[BobbyZhouZijian]

Find now works for status.

Must search for the exact word of the status. E.g. "incomplete" will find all incomplete tasks, but "inc" will not match any.

Have not refactored the docs yet. Waiting for some kind guy to fix it. I'm too sleepy now and need to rest.

Fix #146
Fix #17

[MarcTzh]

Hi Zijian, I conducted some boundary value analysis and found that it works as intended for the positive test cases but when i put in find status: it does not throw any error, it says 0 tasks listed, following equivalence partitioning i shall stop further tests

[codecov-io]

Codecov Report

Merging #161 into master will increase coverage by 0.84%.
The diff coverage is 92.15%.

@@             Coverage Diff              @@
##             master     #161      +/-   ##
============================================
+ Coverage     73.39%   74.24%   +0.84%     
- Complexity      462      488      +26     
============================================
  Files            74       74              
  Lines          1421     1460      +39     
  Branches        159      168       +9     
============================================
+ Hits           1043     1084      +41     
+ Misses          332      330       -2     
  Partials         46       46              

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...java/seedu/address/logic/commands/FindCommand.java	100.00% <ø> (ø)	6.00 <0.00> (ø)
...ain/java/seedu/address/model/task/Description.java	85.71% <ø> (ø)	8.00 <0.00> (ø)
src/main/java/seedu/address/model/task/Title.java	80.00% <ø> (ø)	6.00 <0.00> (ø)
...ress/model/task/TaskContainsKeywordsPredicate.java	87.23% <70.00%> (-5.08%)	22.00 <9.00> (+3.00)	⬇️
...c/main/java/seedu/address/model/task/DateTime.java	84.21% <80.00%> (-1.51%)	12.00 <4.00> (+4.00)	⬇️
...ain/java/seedu/address/logic/parser/CliSyntax.java	85.71% <100.00%> (+2.38%)	1.00 <0.00> (ø)
.../seedu/address/logic/parser/FindCommandParser.java	100.00% <100.00%> (+25.00%)	19.00 <15.00> (+14.00)
src/main/java/seedu/address/model/task/Status.java	84.21% <100.00%> (+9.21%)	9.00 <3.00> (+4.00)
src/main/java/seedu/address/model/task/Type.java	93.33% <100.00%> (ø)	11.00 <0.00> (ø)
... and 3 more

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[MarcTzh]

A few problems I found:
find status: XXX where XXX is an invalid input, returns 0 tasks found as well

Error message displayed should state that status can only be of 2 values: complete and incomplete.

find date:01-01-202 is also accepted and the date 01-01-2020 matches it, should this be considered an incorrect input

[MarcTzh]

Minor changes

[MarcTzh]

one minor change, LGTM

[dearvae]

I feel the original code is correct?