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Cucumber's wire protocol allows step definitions to be
implemented and invoked on any platform.
Communication is over a TCP socket, which Cucumber connects to when it finds
a definition file with the .wire extension in the step_definitions folder
(or other load path). Note that these files are rendered with ERB when loaded.
A WirePacket flowing in either direction is formatted as a JSON-encoded
string, with a newline character signaling the end of a packet. See the
specs for Cucumber::WireSupport::WirePacket for more details.
Cucumber sends the following request messages out over the wire:
step_matches- Find out whether the wire server has a definition for a step
invoke- Ask for a step definition to be invoked
begin_scenario- signals that cucumber is about to execute a scenario
end_scenario- signals that cucumber has finished executing a scenario
snippet_text- requests a snippet for an undefined step
Every message supports two standard responses:
success- expects different arguments (sometimes none at all) depending on the request that was sent.
fail- causes a Cucumber::WireSupport::WireException to be raised.
Some messages support more responses - see individual scenarios for details.
- ERB configuration
- Handle unexpected response
- Invoke message
- Snippets message
- Step matches message
- Wire protocol table diffing
- Wire protocol tags
- Wire protocol timeouts
Last published over 7 years ago by mattwynne.