import { describe, it, expect, beforeAll } from "vitest";
import { convertBase64ToImageSrc } from "../../src/utils/base64ToImage.js";
import fs from "fs";
import path from "path";

let sampleBase64: string;

beforeAll(() => {
    // Load base64 sample from text file
    const filePath = path.resolve(__dirname, "base64Sample.txt");
    sampleBase64 = fs.readFileSync(filePath, "utf8").trim();
});

describe("convertBase64ToImageSrc", () => {
    it("should return the same string if it is already a valid data URL", () => {
        const base64Image = `data:image/png;base64,${sampleBase64}`;
        expect(convertBase64ToImageSrc(base64Image)).toBe(base64Image);
    });

    it("should correctly format a raw Base64 string as a PNG image URL", () => {
        expect(convertBase64ToImageSrc(sampleBase64)).toBe(`data:image/png;base64,${sampleBase64}`);
    });
});