@metamask/snaps-simulation/dist/middleware/mock.mjs

A simulation framework for MetaMask Snaps, enabling headless testing of Snaps in a controlled environment

import { createAsyncMiddleware } from "@metamask/json-rpc-engine";
import { getJsonRpcMocks, removeJsonRpcMock } from "../store/mocks.mjs";
/**
 * Create a middleware for handling JSON-RPC methods that have been mocked.
 *
 * @param store - The Redux store to use.
 * @returns A middleware function.
 */
export function createMockMiddleware(store) {
    return createAsyncMiddleware(async (request, response, next) => {
        const mocks = getJsonRpcMocks(store.getState());
        const keys = Object.keys(mocks);
        for (const key of keys) {
            const { implementation, once } = mocks[key];
            const result = await implementation(request);
            if (result !== undefined) {
                if (once) {
                    store.dispatch(removeJsonRpcMock(key));
                }
                response.result = result;
                return;
            }
        }
        await next();
    });
}
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