Pokémon VGC Damage Calculator MCP Server

import { describe, it, expect } from 'vitest'; import { calculateDamage } from './calculator.js'; import type { CalculateDamageRequest } from './types.js'; describe('calculateDamage', () => { it('should calculate damage for a basic scenario', () => { const request: CalculateDamageRequest = { attacker: { species: "Pikachu", level: 50, ability: "Static", item: "Light Ball", nature: "Timid", evs: { spa: 252, spe: 252, hp: 4 }, ivs: { hp: 31, atk: 0, def: 31, spa: 31, spd: 31, spe: 31 } }, defender: { species: "Charizard", level: 50, ability: "Blaze", nature: "Modest", evs: { hp: 252, spa: 252, spd: 4 }, ivs: { hp: 31, atk: 0, def: 31, spa: 31, spd: 31, spe: 31 } }, move: { name: "Thunderbolt", isCrit: false }, field: { gameType: "Singles", weather: "", terrain: "" } }; const result = calculateDamage(request); expect(result.description).toContain("Pikachu"); expect(result.description).toContain("Thunderbolt"); expect(result.description).toContain("Charizard"); expect(result.damage).toHaveLength(2); expect(result.damage[0]).toBeGreaterThan(0); expect(result.damage[1]).toBeGreaterThanOrEqual(result.damage[0]); expect(result.koChance).toBeDefined(); expect(typeof result.koChance).toBe('string'); }); it('should handle critical hits', () => { const request: CalculateDamageRequest = { attacker: { species: "Pikachu" }, defender: { species: "Charizard" }, move: { name: "Thunderbolt", isCrit: true }, field: { gameType: "Singles" } }; const result = calculateDamage(request); expect(result.description).toContain("critical hit"); }); it('should throw error for missing attacker species', () => { const request = { attacker: {}, defender: { species: "Charizard" }, move: { name: "Thunderbolt" }, field: { gameType: "Singles" } } as CalculateDamageRequest; expect(() => calculateDamage(request)).toThrow("Attacker species is required"); }); it('should throw error for missing defender species', () => { const request = { attacker: { species: "Pikachu" }, defender: {}, move: { name: "Thunderbolt" }, field: { gameType: "Singles" } } as CalculateDamageRequest; expect(() => calculateDamage(request)).toThrow("Defender species is required"); }); it('should throw error for missing move name', () => { const request = { attacker: { species: "Pikachu" }, defender: { species: "Charizard" }, move: {}, field: { gameType: "Singles" } } as CalculateDamageRequest; expect(() => calculateDamage(request)).toThrow("Move name is required"); }); it('should throw error for invalid Pokemon species', () => { const request: CalculateDamageRequest = { attacker: { species: "InvalidPokemon" }, defender: { species: "Charizard" }, move: { name: "Thunderbolt" }, field: { gameType: "Singles" } }; expect(() => calculateDamage(request)).toThrow("Invalid Pokémon: InvalidPokemon"); }); it('should throw error for invalid move name', () => { const request: CalculateDamageRequest = { attacker: { species: "Pikachu" }, defender: { species: "Charizard" }, move: { name: "InvalidMove" }, field: { gameType: "Singles" } }; expect(() => calculateDamage(request)).toThrow("Calculation failed"); }); it('should handle weather conditions', () => { const request: CalculateDamageRequest = { attacker: { species: "Charizard" }, defender: { species: "Venusaur" }, move: { name: "Flamethrower" }, field: { gameType: "Singles", weather: "Sun" } }; const result = calculateDamage(request); expect(result.description).toContain("in Sun"); }); it('should handle different game types', () => { const request: CalculateDamageRequest = { attacker: { species: "Pikachu" }, defender: { species: "Charizard" }, move: { name: "Thunderbolt" }, field: { gameType: "Doubles" } }; const result = calculateDamage(request); expect(result.damage).toHaveLength(2); expect(result.damage[0]).toBeGreaterThan(0); }); });