Added test cases for UdpSender.send (#328)

[rajovictor]

Signed-off-by: Raja Shekar Reddy Peddireddyy rajovictor@gmail.com

Which problem is this PR solving?

• Resolves UdpSender broken #328

Short description of the changes

• Tests successful send and MessageTooLarge exception case.
• Renamed few test cases to reflect what they are actually doing.

[codecov]

Codecov Report

Merging #667 into master will decrease coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #667      +/-   ##
============================================
- Coverage     89.93%   89.69%   -0.24%     
+ Complexity      569      567       -2     
============================================
  Files            69       69              
  Lines          2086     2086              
  Branches        266      266              
============================================
- Hits           1876     1871       -5     
- Misses          129      133       +4     
- Partials         81       82       +1

Impacted Files	Coverage Δ	Complexity Δ
...rtracing/internal/reporters/CompositeReporter.java	71.42% <0%> (-28.58%)	6% <0%> (-1%)
...gertracing/internal/reporters/LoggingReporter.java	81.81% <0%> (-9.1%)	4% <0%> (-1%)
...egertracing/internal/reporters/RemoteReporter.java	87.35% <0%> (-2.3%)	7% <0%> (ø)
...ernal/baggage/RemoteBaggageRestrictionManager.java	98.3% <0%> (+3.38%)	11% <0%> (ø)	⬇️

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[yurishkuro]

@guo0693 do you mind reviewing this?

[guo0693]

line 212 - 225 seems to be duplicated as line 171 - 187. Can we just have one test: testSendSpanWithOperationName() for two test cases:
operationName, expException?

for( test : testCases) {
  //create span etc using test.operationName
 ...
  if(test.expException) {
    //try send
    //assert exception caught
  } else {
    //assert received spans.
  }
}

[guo0693]

Feel like original name makes sense, the flush function cause the send of the spans, and server side gets the batch.

[rajovictor]

Since its appending before Flush, I thought the new name covers the intent well.
Do avoid the duplicate code, I extracted the Span creation into a method.

[yurishkuro]

@rajovictor do these tests add something different than #670? If so, could you please rebase?