createTestCapabilities

createTestCapabilities(overrides?): PlatformCapabilities

Defined in: packages/runtime/src/platform/test-caps.ts:52

Build PlatformCapabilities for use in tests.

Parameters

overrides?

Partial<PlatformCapabilities>

Per-method replacements. Merged over the defaults via shallow spread.

Returns

PlatformCapabilities

A PlatformCapabilities suitable for test environments.

Remarks

Returns a stub bag where everything rejects with an explanatory Error except compileWasm, which delegates to the host’s WebAssembly.compile (available in Node and browsers). Tests that actually need a capability pass an overrides object — typed Partial<PlatformCapabilities> — and only the overridden methods are replaced. This keeps the failure surface small: an accidental fetch in a test that didn’t opt into HTTP throws immediately.

Used by testRuntime under the hood; prefer that factory unless you need a bare capability bag for a custom harness.

Example

import { createTestCapabilities } from '@fishnet/runtime'

const caps = createTestCapabilities({
  async fetch() { return { ok: true, status: 200, text: async () => 'hi',
                           arrayBuffer: async () => new ArrayBuffer(0),
                           json: async () => ({}) } },
})