KYLIN-4508 Add more unit tests to improve test coverage

[kyotoYaho]

Proposed changes

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Types of changes

What types of changes does your code introduce to Kylin?
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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have create an issue on Kylin's jira, and have described the bug/feature there in detail
• Commit messages in my PR start with the related jira ID, like "KYLIN-0000 Make Kylin project open-source"
• Compiling and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• If this change need a document change, I will prepare another pr against the document branch
• Any dependent changes have been merged

Further comments

If this is a relatively large or complex change, kick off the discussion at user@kylin or dev@kylin by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov-commenter]

Codecov Report

Merging #1228 into master will increase coverage by 1.10%.
The diff coverage is 56.52%.

@@             Coverage Diff              @@
##             master    #1228      +/-   ##
============================================
+ Coverage     24.85%   25.96%   +1.10%     
- Complexity     6266     6520     +254     
============================================
  Files          1453     1453              
  Lines         89225    89243      +18     
  Branches      12456    12458       +2     
============================================
+ Hits          22181    23173     +992     
+ Misses        64869    63810    -1059     
- Partials       2175     2260      +85     

Impacted Files	Coverage Δ	Complexity Δ
...org/apache/kylin/metrics/lib/impl/RecordEvent.java	72.04% <0.00%> (+72.04%)	24.00 <0.00> (+24.00)
...pache/kylin/metrics/lib/impl/TimePropertyEnum.java	73.68% <ø> (+73.68%)	4.00 <0.00> (+4.00)
...pache/kylin/engine/mr/common/JobInfoConverter.java	60.29% <58.33%> (+31.61%)	23.00 <0.00> (+2.00)
...ache/kylin/metrics/lib/impl/BlockingReservoir.java	53.33% <66.66%> (+53.33%)	13.00 <2.00> (+13.00)
...he/kylin/dict/lookup/cache/RocksDBLookupTable.java	72.97% <0.00%> (-5.41%)	6.00% <0.00%> (-1.00%)
...org/apache/kylin/rest/util/QueryRequestLimits.java	35.71% <0.00%> (-4.77%)	5.00% <0.00%> (-1.00%)
...he/kylin/job/impl/threadpool/DefaultScheduler.java	74.41% <0.00%> (-2.33%)	12.00% <0.00%> (ø%)
.../apache/kylin/cube/cuboid/TreeCuboidScheduler.java	63.84% <0.00%> (-2.31%)	0.00% <0.00%> (ø%)
...rg/apache/kylin/cube/inmemcubing/MemDiskStore.java	69.30% <0.00%> (-1.83%)	7.00% <0.00%> (ø%)
...ache/kylin/engine/mr/common/AbstractHadoopJob.java	15.94% <0.00%> (+0.50%)	3.00% <0.00%> (+1.00%)
... and 35 more

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[shaofengshi]

Merged by manual.