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HomeDocsClaude Code CLI 12 Nov 2026
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Test a mod changedplugins/mods/test

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### Check a result with `expect`

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190190| `session.receive` | `($, e) => ({ text: e.text })`. Fire it with `$.session.receive({ origin: { kind: 'peer-send-message' }, text })`. |
191191| `ui.render` | `() => ({ type: 'Text', props: {}, children: ['...'] })` |
192192 
193`expect` has the assertions `toBe`, `toEqual`, `toMatch`, `toMatchObject`, `toContain`, `toBeDefined`, `toBeUndefined`, and `toThrow`, and `.not` before any of them.
193### Check a result with `expect`
194 
195The kit has these assertions, and the one you pick goes after the value you're checking, as in `expect(answer.text).toBe('ok')`:
196 
197* **Equality**: `toBe` for the same value or object, `toEqual` for structure, `toStrictEqual` for structure plus `undefined` fields and the prototype, and `toMatchObject` for the fields you name
198* **Text**: `toMatch`, which takes a regular expression or a substring, `toStartWith`, and `toEndWith`
199* **Numbers**: `toBeGreaterThan`, `toBeGreaterThanOrEqual`, `toBeLessThan`, `toBeLessThanOrEqual`
200* **Contents**: `toContain` for a substring or a member, `toContainEqual` for a member compared by structure, `toHaveLength`, and `toHaveProperty`
201* **Presence and type**: `toBeDefined`, `toBeUndefined`, `toBeNull`, `toBeTruthy`, `toBeFalsy`, `toBeNaN`, `toBeInstanceOf`
202* **Throwing**: `toThrow`, for a function `expect` calls, or for a promise you check with `.rejects`
203 
204Put `.not` in front of an assertion to check the opposite, and `.resolves` or `.rejects` to check what a promise settles with.
194205 
195206When an `expect` fails inside a stub or hook that you passed to `on` as a plain function rather than an async generator, the test fails. The engine skips that hook, and the failure output names it, such as `in the test's store.set hook`.
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