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Update CONTRIBUTING.md to show how to debug mjolnir. (#433)

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CONTRIBUTING.md
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@ -15,13 +15,82 @@ relevant project on github, and then [create a pull request](
https://help.github.com/articles/using-pull-requests/) to ask us to pull
your changes into our repo.
We use [Buildkite](https://buildkite.com/matrix-dot-org/mjolnir) for continuous
integration. If your change breaks the build, this will be shown in GitHub, so
We use Github Actions for continuous integration.
If your change breaks the build, this will be shown in GitHub, so
please keep an eye on the pull request for feedback.
## Development
To run unit tests in a local development environment, you can use `yarn test`
and `yarn lint`.
### mx-tester
For integration testing, and spinning up a local synapse we use
[mx-tester](https://github.com/matrix-org/mx-tester).
While not required for basic changes, it is strongly recommended
to use mx-tester or have the ability to spin up your own
development Synapse to develop mjolnir interactively.
To install `mx-tester` you will need the [rust toolchain](https://rustup.rs/)
and Docker. You should refer to your linux distribution's documentation
for installing both, and do not naively follow the instructions
from rustup.rs without doing so first.
Then you will be able to install `mx-tester` with `cargo install mx-tester`.
Updating mx-tester can be done by installing `cargo install cargo-update`
and using `cargo install-update mx-tester`, though you may skip
this step until it is necessary to update `mx-tester`.
#### Usage
You can then start a local synapse using `mx-tester build`,
followed by `mx-tester up`. You can then use `up`, `down` as many
times as you like.
If for some reason you need to get a clean Synapse database,
you can just use `mx-tester down build`.
### Debugging
For debugging mx-tester it is recommended to use Visual Studio Code.
If you open the project in visual studio code, press `F1`,
type `Debug: JavaScript Debug Terminal`
(see the [documentation](https://code.visualstudio.com/docs/nodejs/nodejs-debugging#_javascript-debug-terminal)),
and you should get a terminal from which node will always connect to
Visual Studio Code.
The following sections assume that a Synapse is running
and `config/harness.yaml` has been configured to connect to it.
If you are using `mx-tester` and you use `mx-tester up`, this will
already be the case.
#### Debugging and reproducing an issue
If you need to debug an issue that is occurring through use in matrix,
say the unban command has stopped working, you can launch
mjolnir from the JavaScript Debug Terminal using `yarn test:manual`.
This will launch mjolnir using the config found in `config/harness.yaml`.
You can now open https://app.element.io, change the server to `localhost:8081`,
and then create an account.
From here you can join the room `#moderators:localhost:9999` (you will also be
able to find it in the rooms directory) and interact with mjolnir.
It is recommended to set breakpoints in the editor while interacting
and switch the tab to "DEBUG CONSOLE" (within Visual Studio Code)
to evaluate arbitrary expressions in the currently paused context (when
a breakpoint has been hit).
#### Debugging an integration test
To debug the integration test suite from the JavaScript Debug Terminal,
you can start them using `yarn test:integration`.
However, more often than not there is a specific section of
code you will be working on that has specific tests. Running
the entire suite is therefore unnecessary.
To run a specific test from the JavaScript Debug Terminal,
you can use the script `yarn test:integration:single test/integration/banListTest.ts`,
where `test/integration/banListTest.ts` is the name of the integration test you
want to run.
## Code style
All Matrix projects have a well-defined code-style - and sometimes we've even

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package.json
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@ -14,7 +14,9 @@
"start:dev": "yarn build && node --async-stack-traces lib/index.js",
"test": "ts-mocha --project ./tsconfig.json test/commands/**/*.ts",
"test:integration": "NODE_ENV=harness ts-mocha --async-stack-traces --require test/integration/fixtures.ts --timeout 300000 --project ./tsconfig.json \"test/integration/**/*Test.ts\"",
"test:integration:single": "NODE_ENV=harness npx ts-mocha --require test/integration/fixtures.ts --timeout 300000 --project ./tsconfig.json",
"test:appservice:integration": "NODE_ENV=harness ts-mocha --async-stack-traces --timeout 300000 --project ./tsconfig.json \"test/appservice/integration/**/*Test.ts\"",
"test:appservice:integration:single": "NODE_ENV=harness npx ts-mocha --timeout 300000 --project ./tsconfig.json",
"test:manual": "NODE_ENV=harness ts-node test/integration/manualLaunchScript.ts",
"version": "sed -i '/# version automated/s/[0-9][0-9]*\\.[0-9][0-9]*\\.[0-9][0-9]*/'$npm_package_version'/' synapse_antispam/setup.py && git add synapse_antispam/setup.py && cat synapse_antispam/setup.py"
},