Add test cases v1.4

[laihuiqi]

• logic / commands
  ** Clear, ClearBy, Delete, Exit, Revert, RevertAll, task package
• logic / parser
  ** ClearBy, Delete, task package
• model / tag
  ** TaskType
• testutils
  ** task, note, todo
• ui
  ** uiPart

[codecov]

Codecov Report

Patch coverage: 30.00% and project coverage change: +5.91 🎉

Comparison is base (b7d713a) 25.94% compared to head (62efb9e) 31.85%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #271      +/-   ##
============================================
+ Coverage     25.94%   31.85%   +5.91%     
- Complexity      481      595     +114     
============================================
  Files           192      192              
  Lines          4807     4809       +2     
  Branches        602      603       +1     
============================================
+ Hits           1247     1532     +285     
+ Misses         3409     3115     -294     
- Partials        151      162      +11     

Impacted Files	Coverage Δ
...a/seedu/address/logic/commands/ClearByCommand.java	91.04% <ø> (ø)
...u/address/logic/commands/task/FindTaskCommand.java	66.66% <ø> (+33.33%)	⬆️
.../logic/commands/task/todo/EditDeadlineCommand.java	82.75% <ø> (+55.17%)	⬆️
...va/seedu/address/logic/parser/task/TaskParser.java	80.95% <ø> (ø)
...rc/main/java/seedu/address/model/tag/TaskType.java	100.00% <ø> (+28.57%)	⬆️
.../seedu/address/model/task/ApplicationDeadline.java	58.33% <ø> (+8.33%)	⬆️
...s/model/task/ContentContainsKeywordsPredicate.java	71.42% <ø> (+28.57%)	⬆️
src/main/java/seedu/address/model/task/Note.java	68.75% <ø> (+21.87%)	⬆️
...ain/java/seedu/address/model/task/NoteContent.java	70.00% <ø> (+20.00%)	⬆️
.../java/seedu/address/model/task/UniqueNoteList.java	43.90% <ø> (+21.95%)	⬆️
... and 18 more

... and 24 files with indirect coverage changes

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