polaris-task-force/tests/int/poker-hand-hint.int.spec.ts

import { describe, expect, it } from "vitest";
import { describeHandStrength } from "@/lib/minigames/poker/handHint";
import type { Card, Rank, Suit } from "@/lib/minigames/poker";

const c = (rank: Rank, suit: Suit): Card => ({ rank, suit });

describe("poker hand strength hints", () => {
  it("describes a preflop pair", () => {
    expect(describeHandStrength([c(13, "s"), c(13, "h")], [])).toEqual({
      label: "Pair of Kings",
      bestCardKeys: ["13-s", "13-h"],
    });
  });

  it("describes a preflop high card", () => {
    expect(describeHandStrength([c(14, "s"), c(9, "h")], [])).toEqual({
      label: "High card Ace",
      bestCardKeys: ["14-s"],
    });
  });

  it("describes flop two pair and returns the exact best cards", () => {
    const hint = describeHandStrength([c(13, "s"), c(9, "h")], [c(13, "d"), c(9, "c"), c(2, "s")]);

    expect(hint?.label).toBe("Two pair, Kings and Nines");
    expect(new Set(hint?.bestCardKeys)).toEqual(new Set(["13-s", "9-h", "13-d", "9-c", "2-s"]));
  });

  it("describes a river straight that uses one hole card", () => {
    const hint = describeHandStrength(
      [c(6, "s"), c(14, "h")],
      [c(2, "c"), c(3, "d"), c(4, "h"), c(5, "s"), c(13, "c")],
    );

    expect(hint?.label).toBe("Straight, Six high");
    expect(new Set(hint?.bestCardKeys)).toEqual(new Set(["6-s", "2-c", "3-d", "4-h", "5-s"]));
  });

  it("labels a wheel straight as five high", () => {
    expect(
      describeHandStrength(
        [c(14, "s"), c(13, "h")],
        [c(2, "c"), c(3, "d"), c(4, "h"), c(5, "s"), c(9, "c")],
      )?.label,
    ).toBe("Straight, Five high");
  });
});