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sousa-gecko/testing/docs/assert.md
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Sylvestre Ledru 8f033c8241 Bug 2038819 - Convert testing/**/docs RST to Markdown r=jdescottes,firefox-source-docs-reviewers,ahal
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Differential Revision: https://phabricator.services.mozilla.com/D304228
2026-07-04 10:18:34 +00:00

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(assert-module)=
# Assert module
For XPCShell tests and mochitests, `Assert` is already present as an
instantiated global to which you can refer - you don't need to construct it
yourself. You can immediately start using `Assert.ok` and similar methods as
test assertions.
The full class documentation follows, but it is perhaps worth noting that this
API is largely identical to
[NodeJS' assert module](https://nodejs.org/api/assert.html), with some
omissions/changes including strict mode and string matching.
```{js:autoclass} Assert
:members: ok, equal, notEqual, strictEqual, notStrictEqual, deepEqual, notDeepEqual,
greater, less, greaterOrEqual, lessOrEqual, stringContains, stringMatches,
throws, rejects, *
```