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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
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, *
```