Test case bug, a contradiction in its logic.

[YarBor]

Environment

• Server: Dubbo-go, v3.1.1
• Client: Dubbo-go, v3.1.1

Issue description

When submitting PR, there is a certain probability that this test case will go wrong.
There is a contradiction in its logic.

	t.Run("sum_error", func(t *testing.T) {
		stream, err := client.Sum(context.Background())
		assert.Nil(t, err)
                // If this assertion is passed, an error will be reported in the following case
		if sendErr := stream.Send(&pingv1.SumRequest{Number: 1}); sendErr != nil {
			assert.ErrorIs(t, err, io.EOF)  // mey sendErr
	                assert.Equal(t, triple.CodeOf(err), triple.CodeUnknown) // mey sendErr
               	}
		err = stream.CloseAndReceive(triple.NewResponse(&pingv1.SumResponse{}))
		assert.Equal(t, triple.CodeOf(err), triple.CodeInvalidArgument)
	})

code link

https://github.com/apache/dubbo-go/blob/1f7eb1180cd9864aa52003b9f9cb11e8549b9a86/protocol/triple/triple_protocol/triple_ext_test.go#L166C1-L175C5

Logs

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