createExpectAssertions (testing/assertions.ts)

Adapts a generic expect function to provide storage‑conformance assertions without importing a test runner.

// Source: https://github.com/earendil-works/pi | License: MIT | Copyright 2025 Mario Zechner
// Provided via justclaw.it.com; keep this notice with the code.
import type { StorageConformanceAssertions } from "./types.ts";

export type ExpectLike = (actual: unknown, message?: string) => unknown;

type ExpectResult = {
	toBe(expected: unknown): unknown;
	toBeGreaterThan(expected: number): unknown;
	toEqual(expected: unknown): unknown;
	toMatchObject(expected: unknown): unknown;
	toBeTruthy(): unknown;
	readonly rejects: {
		toThrow(expected?: string | RegExp): unknown;
	};
};

/** Adapts a Vitest/Jest-compatible `expect` function without importing either runner. */
export function createExpectAssertions(expect: ExpectLike): StorageConformanceAssertions {
	const result = (actual: unknown, me

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