[Feat]: Test for blocking vs non-blocking sendMessage requests #85
Description
Is your feature request related to a problem? Please describe.
No response
Describe the solution you'd like
Until a2aproject/a2a-java#327 we ignored blocking vs non-blocking behaviour, but still passed the TCK. So it seems the TCK needs to test for this.
Describe alternatives you've considered
No response
Additional context
No response
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