Multimeter is a Git-native REST client and API testing tool for VS Code. Requests, tests, mocks, and docs are YAML .mmt files in Git — the same files in the visual editor and in CI via testlight. Apache 2.0. No account.

How do I use Multimeter with Cursor, Copilot, or Claude?

Install the VS Code/Cursor extension or add MCP with npx -y mmt-mcp. Agents should call scaffold_test, validate, format, and run instead of guessing .mmt syntax.

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assert — Multimeter docs

Use assert when a failed comparison must stop the test flow. Syntax, operators, and report options are identical to check — only the failure behavior differs.Markdown (no JavaScript)# assert Use `assert` when a failed comparison must **stop the test flow**. Syntax, [operators](../operators.md), and [report](../reports.md#report-levels-all-fails-none) options are identical to [check](./check.md) — only the failure behavior differs. Prefer call [`require`](./call.md#require) (or soft [`expect`](./call.md#expect)) when the comparison only uses **that call’s** outputs. Keep standalone `assert` / `check` for **two different** values. See [Prefer accurate expects](../operators.md#prefer-accurate-expects-not-only--null). | Step | On failure | |------|------------| | [check](./check.md) | Log and report; continue | | **assert** | Log and report; **stop execution** | | [expect on call/http](./call.md#expect) | Soft (continue) | | [require on call/http](./call.md#require) | Hard (stop) — same map as expect | ## Examples ```yaml - assert: ${doLogin.status} == 200 - assert: ${profile.token} != omit ``` Object form (same fields as check): ```yaml - assert: actual: ${doLogin.status} operator: "==" expected: 200 title: Login status report: fails ``` - Operators: [Operators](../operators.md) · [omit](../omit.md) - Report levels (`all` / `fails` / `none`): [Reports — Report levels](../reports.md#report-levels-all-fails-none) - Object fields and inline form: [check](./check.md) --- See also: [check](./check.md) · [Operators](../operators.md) · [call](./call.md) · [run](./run.md) For AI agents · llms.txt · Home