Add note about test data.

[Shylock-Hg]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

Checklist:

Tests:

• Unit test(positive and negative cases)
• Function test
• Performance test
• N/A

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....

[yixinglu]

Only so simple notes? Is there anything else?

[Shylock-Hg]

Only so simple notes? Is there anything else?

No

[codecov-commenter]

Codecov Report

Base: 77.24% // Head: 77.31% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (7cce843) compared to base (c3866b3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5057      +/-   ##
==========================================
+ Coverage   77.24%   77.31%   +0.06%     
==========================================
  Files        1105     1105              
  Lines       82129    82135       +6     
==========================================
+ Hits        63442    63502      +60     
+ Misses      18687    18633      -54     

Impacted Files	Coverage Δ
src/storage/mutate/AddEdgesProcessor.cpp	78.62% <0.00%> (-2.22%)	⬇️
src/parser/GraphScanner.h	92.63% <0.00%> (-2.00%)	⬇️
src/kvstore/raftex/Host.cpp	71.70% <0.00%> (-1.93%)	⬇️
src/codec/RowReaderWrapper.h	95.08% <0.00%> (-1.59%)	⬇️
src/common/process/ProcessUtils.cpp	84.70% <0.00%> (-1.18%)	⬇️
src/kvstore/listener/Listener.cpp	82.97% <0.00%> (-1.07%)	⬇️
src/kvstore/Part.cpp	53.29% <0.00%> (-0.70%)	⬇️
src/kvstore/raftex/RaftPart.cpp	69.98% <0.00%> (-0.50%)	⬇️
src/storage/query/QueryBaseProcessor-inl.h	79.65% <0.00%> (-0.46%)	⬇️
src/common/datatypes/ValueOps-inl.h	60.71% <0.00%> (-0.38%)	⬇️
... and 25 more

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