1 unstable release

0.1.0 Feb 9, 2023

#669 in Cargo plugins

GPL-3.0 license

235 lines


A Cargo plugin for running Cogno tests. It can be installed using

$ cargo install cargo-cogno --locked

You will need to add the associated test harness to your project and follow the setup instruction.


You can select the specification to test using the --spec flag

$ cargo cogno --spec 'spec-1234'

Or test multiple specifications at the same time

$ cargo cogno --spec 'spec-1234' --spec 'spec-1235'

You can select a reporter to use with the --reporter flag

$ cargo cogno --spec 'spec-1234' --reporter raw

The console reporter is the default if available (it is an optional feature of the Cogno test harness). Otherwise, the raw reporter is the default. The raw reporter dumps the raw test results as a JSON file in the current directory.

You can load a modifier configuration file using the --modifier flag

$ cargo cogno --spec 'spec-1234' --modifier modifier-spec-1234.toml

Or load multiple modifier configuration files at the same time

$ cargo cogno --spec 'spec-1234' --spec 'spec-1235' --modifier modifier-spec-1234.toml --modifier modifier-spec-1235.toml

You can enable tracing for the Cogno test harness using the --trace flag.

$ cargo cogno --spec 'spec-1234' --trace

This will print detailed information to the console which can be useful to debug issues. This is most useful to Cogno test harness developers. However, you can add additional tracing information to your tests if necessary that consumers of your tests can use to debug issues.

You can pass extra arguments to cargo run when calling cargo cogno. For example, to pass the --quiet flag to Cargo you can use

$ cargo cogno --spec 'spec-1234' -- --quiet

Any cargo run CLI options can be specified after a -- to separate the arguments for cogno and run.

You can think of the cogno Cargo plugin as a pre-processor for the project. The implementation replaces the plugin process with a cargo run process once the required setup is done.


~1M SLoC