Fixed tests: Do not assume that the response of a post message request is always received before this new message coming down trough the event stream.
Fixed tests: Do not assume that the response of a post message request is always received before this new message coming down trough the event stream.

matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk