71 lines
1.8 KiB
TypeScript
71 lines
1.8 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import { rollInitiative } from "../roll-initiative.js";
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import { isDomainError } from "../types.js";
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describe("rollInitiative", () => {
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describe("valid rolls", () => {
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it("normal roll: 15 + modifier 7 = 22", () => {
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expect(rollInitiative(15, 7)).toBe(22);
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});
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it("boundary: roll 1 + modifier 0 = 1", () => {
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expect(rollInitiative(1, 0)).toBe(1);
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});
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it("boundary: roll 20 + modifier 0 = 20", () => {
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expect(rollInitiative(20, 0)).toBe(20);
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});
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it("negative modifier: roll 1 + (−3) = −2", () => {
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expect(rollInitiative(1, -3)).toBe(-2);
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});
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it("zero modifier: roll 10 + 0 = 10", () => {
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expect(rollInitiative(10, 0)).toBe(10);
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});
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it("large positive modifier: roll 20 + 12 = 32", () => {
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expect(rollInitiative(20, 12)).toBe(32);
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});
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});
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describe("invalid dice rolls", () => {
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it("rejects 0", () => {
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const result = rollInitiative(0, 5);
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expect(isDomainError(result)).toBe(true);
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if (isDomainError(result)) {
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expect(result.code).toBe("invalid-dice-roll");
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}
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});
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it("rejects 21", () => {
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const result = rollInitiative(21, 5);
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expect(isDomainError(result)).toBe(true);
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if (isDomainError(result)) {
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expect(result.code).toBe("invalid-dice-roll");
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}
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});
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it("rejects non-integer (3.5)", () => {
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const result = rollInitiative(3.5, 0);
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expect(isDomainError(result)).toBe(true);
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});
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it("rejects negative dice roll", () => {
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const result = rollInitiative(-1, 0);
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expect(isDomainError(result)).toBe(true);
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});
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it("rejects NaN", () => {
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const result = rollInitiative(Number.NaN, 0);
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expect(isDomainError(result)).toBe(true);
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});
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});
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describe("determinism", () => {
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it("same input produces same output", () => {
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expect(rollInitiative(10, 5)).toBe(rollInitiative(10, 5));
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});
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});
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});
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