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test(ft): describe the complex test case with comments 

In order to make the test client model and behavior clearer.
This commit is contained in:
Andrew Mayorov 2023-02-17 19:59:06 +03:00 committed by Ilya Averyanov
parent 10d4c4305a
commit a3f47641f3
1 changed files with 19 additions and 0 deletions
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19
apps/emqx_ft/test/emqx_ft_SUITE.erl
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@ -429,25 +429,41 @@ t_unreliable_migrating_client(Config) ->
payload => Payload
},
Commands = [
% Connect to the broker on the current node
{fun connect_mqtt_client/2, [NodeSelf]},
% Send filemeta and 3 initial segments
% (assuming client chose 100 bytes as a desired segment size)
{fun send_filemeta/2, [Meta]},
{fun send_segment/3, [0, 100]},
{fun send_segment/3, [100, 100]},
{fun send_segment/3, [200, 100]},
% Disconnect the client cleanly
{fun stop_mqtt_client/1, []},
% Connect to the broker on `Node1`
{fun connect_mqtt_client/2, [Node1]},
% Connect to the broker on `Node2` without first disconnecting from `Node1`
% Client forgot the state for some reason and started the transfer again.
% (assuming this is usual for a client on a device that was rebooted)
{fun connect_mqtt_client/2, [Node2]},
{fun send_filemeta/2, [Meta]},
% This time it chose 200 bytes as a segment size
{fun send_segment/3, [0, 200]},
{fun send_segment/3, [200, 200]},
% But now it downscaled back to 100 bytes segments
{fun send_segment/3, [400, 100]},
% Client lost connectivity and reconnected
% (also had last few segments unacked and decided to resend them)
{fun connect_mqtt_client/2, [Node2]},
{fun send_segment/3, [200, 200]},
{fun send_segment/3, [400, 200]},
% Client lost connectivity and reconnected, this time to another node
% (also had last segment unacked and decided to resend it)
{fun connect_mqtt_client/2, [Node1]},
{fun send_segment/3, [400, 200]},
{fun send_segment/3, [600, eof]},
{fun send_finish/1, []},
% Client lost connectivity and reconnected, this time to the current node
% (client had `fin` unacked and decided to resend it)
{fun connect_mqtt_client/2, [NodeSelf]},
{fun send_finish/1, []}
],
@ -457,6 +473,9 @@ t_unreliable_migrating_client(Config) ->
ReadyTransferIds =
[Id || {#{<<"clientid">> := CId} = Id, _Info} <- ReadyTransfers, CId == ClientId],
% NOTE
% The cluster had 2 assemblers running on two different nodes, because client sent `fin`
% twice. This is currently expected, files must be identical anyway.
Node1Bin = atom_to_binary(Node1),
NodeSelfBin = atom_to_binary(NodeSelf),
?assertMatch(