tests/unit/morse.test.js

import { describe, it, expect } from "vitest";
import {
    textToMorse,
    morseToText,
    morseToTokens,
    isEncodable,
} from "../../lib/morse.js";

describe("textToMorse", () => {
    it("encodes SOS", () => {
        expect(textToMorse("SOS").morse).toBe("... --- ...");
    });

    it("is case-insensitive", () => {
        expect(textToMorse("sos").morse).toBe("... --- ...");
    });

    it("separates words with /", () => {
        expect(textToMorse("HI YOU").morse).toBe(".... .. / -.-- --- ..-");
    });

    it("encodes digits and punctuation", () => {
        expect(textToMorse("E1?").morse).toBe(". .---- ..--..");
    });

    it("reports skipped (non-encodable) characters", () => {
        const r = textToMorse("Aé😀");
        expect(r.morse).toBe(".-");
        expect(r.skipped).toContain("É");
    });
});

describe("morseToText", () => {
    it("decodes SOS", () => {
        expect(morseToText("... --- ...")).toBe("SOS");
    });

    it("decodes multi-word with /", () => {
        expect(morseToText(".... .. / -.-- --- ..-")).toBe("HI YOU");
    });

    it("round-trips a sentence", () => {
        const text = "HELLO WORLD 123";
        expect(morseToText(textToMorse(text).morse)).toBe(text);
    });

    it("maps unknown pattern to ?", () => {
        expect(morseToText("........")).toBe("?");
    });
});

describe("morseToTokens", () => {
    it("flattens A (.-) into dot, elemGap, dah", () => {
        expect(morseToTokens(".-")).toEqual(["dot", "elemGap", "dah"]);
    });

    it("inserts letterGap between letters and wordGap between words", () => {
        // "E E / E" -> dot, letterGap, dot, wordGap, dot
        expect(morseToTokens(". . / .")).toEqual([
            "dot", "letterGap", "dot", "wordGap", "dot",
        ]);
    });
});

describe("isEncodable", () => {
    it("accepts letters/digits, rejects emoji", () => {
        expect(isEncodable("a")).toBe(true);
        expect(isEncodable("7")).toBe(true);
        expect(isEncodable("😀")).toBe(false);
    });
});