Add unit tests three

[TheRealHaui]

Added additional Unit Tests to increase code coverage.

[asfgit]

Can one of the admins verify this patch?

[coveralls]

Pull Request Test Coverage Report for Build 4490

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.03%) to 27.984%

---

Files with Coverage Reduction	New Missed Lines	%
core-dictionary/src/main/java/org/apache/kylin/dict/lookup/cache/RocksDBLookupTable.java	1	81.08%
core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java	5	77.81%

Totals
Change from base Build 4487:	0.03%
Covered Lines:	22911
Relevant Lines:	81871

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #639 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master    #639      +/-   ##
===========================================
+ Coverage     25.48%   25.5%   +0.01%     
- Complexity     5892    5900       +8     
===========================================
  Files          1379    1379              
  Lines         81871   81871              
  Branches      11479   11479              
===========================================
+ Hits          20863   20878      +15     
+ Misses        58986   58964      -22     
- Partials       2022    2029       +7

Impacted Files	Coverage Δ	Complexity Δ
...he/kylin/dict/lookup/cache/RocksDBLookupTable.java	72.97% <0%> (-5.41%)	6% <0%> (-1%)
...rg/apache/kylin/cube/inmemcubing/MemDiskStore.java	69.3% <0%> (-0.92%)	7% <0%> (ø)
...apache/kylin/engine/mr/common/HadoopCmdOutput.java	14.7% <0%> (+14.7%)	4% <0%> (+4%)	⬆️
...ylin/engine/mr/common/DefaultX509TrustManager.java	35.71% <0%> (+35.71%)	5% <0%> (+5%)	⬆️

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[nichunen]

Fine to me