/// TEST: Client streaming with multiple requests
/// EXPECT: PASS
/// EXPLAIN: ClientStreaming
--- ENDPOINT ---
echo.EchoService/Repeat

--- REQUEST ---
{
  "message": "Hello"
}
--- REQUEST ---
{
  "message": "World"
}
--- REQUEST ---
{
  "message": "Test"
}

--- RESPONSE ---
{
  "total_messages": 3,
  "concatenated": "Hello World Test"
}

--- ASSERTS ---
.total_messages == 3
@len(.concatenated) > 0
