Improve gocyclo score

[fredmaggiowski]

The gocyclo tool used by goreport card reported the following:

Gocyclo calculates cyclomatic complexities of functions in Go source code. The cyclomatic complexity of a function is calculated according to the following rules: 1 is the base complexity of a function +1 for each 'if', 'for', 'case', '&&' or '||' Go Report Card warns on functions with cyclomatic complexity > 15.

gonyan/bufferedstream_test.go
Line 51: warning: cyclomatic complexity 21 of function TestSetStartingSize() is high (> 15) (gocyclo)
Line 241: warning: cyclomatic complexity 19 of function TestAutonomousTransmissionRoutine() is high (> 15) (gocyclo)
Line 162: warning: cyclomatic complexity 16 of function TestSetSchedulingInterval() is high (> 15) (gocyclo)

To keep the whole code easy and clean let's simplify these tests.