logos-storage-js/src/fetch-safe/fetch-safe.test.ts

import assert from "assert";
import { describe, it } from "node:test";
import { Fetch } from '../fetch-safe/fetch-safe';

class MockResponse implements Response {
    headers: Headers = new Headers()
    ok: boolean;
    redirected = false
    status: number;
    statusText = "";
    type = "basic" as "basic"
    url = ""
    body = null;
    bodyUsed = false;
    _text: string

    constructor(ok: boolean, status: number, text: string) {
        this.ok = ok
        this.status = status
        this._text = text
    }

    clone(): Response {
        throw new Error("Method not implemented.");
    }

    arrayBuffer(): Promise<ArrayBuffer> {
        throw new Error("Method not implemented.");
    }

    blob(): Promise<Blob> {
        throw new Error("Method not implemented.");
    }

    formData(): Promise<FormData> {
        throw new Error("Method not implemented.");
    }

    json(): Promise<any> {
        return Promise.resolve(JSON.parse(this._text))
    }

    text(): Promise<string> {
        return Promise.resolve(this._text)
    }
}

describe("fetch", () => {
    it("returns an error when the http call failed", async (t) => {
        global.fetch = t.mock.fn(() =>
            Promise.resolve(new MockResponse(false, 500, "error")),
        );

        const result = await Fetch.safe("http://localhost:3000/some-url", { method: "GET" })
        const error = {
            type: "api",
            message: "error",
            status: 500
        }

        assert.deepStrictEqual(result, { error: true, data: error });
    });

    it("returns an error when the json parsing failed", async (t) => {
        global.fetch = t.mock.fn(() =>
            Promise.resolve(new MockResponse(true, 200, "")),
        );

        const result = await Fetch.safe("http://localhost:3000/some-url", { method: "GET" })
        const error = {
            type: "error",
            message: "Unexpected end of JSON input"
        }

        assert.deepStrictEqual(result, { error: true, data: error });
    });


    it("returns the data when the fetch succeed", async (t) => {
        global.fetch = t.mock.fn(() =>
            Promise.resolve(new MockResponse(true, 200, JSON.stringify({ hello: "world" }))),
        );

        const result = await Fetch.safe("http://localhost:3000/some-url", { method: "GET" })

        assert.deepStrictEqual(result, { error: false, data: { hello: "world" } });
    });
});