96 lines
3.3 KiB
JavaScript
96 lines
3.3 KiB
JavaScript
// MLB park factors (Session 15) — pin the membership list + assert
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// the expected magnitude of the headline parks. Park factors shift
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// year-to-year but the directional signal (Coors hot, Oracle cold)
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// is stable; the test catches obvious typos.
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const pf = require('../../src/data/parkFactors');
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describe('parkFactors', () => {
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test('covers all 30 MLB teams', () => {
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const codes = Object.keys(pf.PARK_FACTORS);
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expect(codes.length).toBe(30);
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});
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test('every entry has hr/h/r as finite numbers', () => {
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for (const [code, vals] of Object.entries(pf.PARK_FACTORS)) {
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expect(typeof code).toBe('string');
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expect(code).toMatch(/^[A-Z]{2,3}$/);
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expect(Number.isFinite(vals.hr)).toBe(true);
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expect(Number.isFinite(vals.h)).toBe(true);
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expect(Number.isFinite(vals.r)).toBe(true);
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}
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});
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test('Coors Field is the most extreme HR park', () => {
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const hrs = Object.values(pf.PARK_FACTORS).map((p) => p.hr);
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const maxHr = Math.max(...hrs);
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expect(pf.PARK_FACTORS.COL.hr).toBe(maxHr);
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expect(pf.PARK_FACTORS.COL.hr).toBeGreaterThan(120);
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});
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test('Oracle Park (SF) suppresses HRs heavily', () => {
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expect(pf.PARK_FACTORS.SF.hr).toBeLessThan(95);
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});
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test('Coors also boosts hits and runs', () => {
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expect(pf.PARK_FACTORS.COL.h).toBeGreaterThan(100);
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expect(pf.PARK_FACTORS.COL.r).toBeGreaterThan(100);
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});
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test('most parks land within ±15% of neutral', () => {
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// Coors + SF are deliberate outliers; check the rest cluster.
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const codes = Object.keys(pf.PARK_FACTORS).filter((c) => c !== 'COL' && c !== 'SF');
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for (const code of codes) {
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const { hr, h, r } = pf.PARK_FACTORS[code];
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expect(hr).toBeGreaterThanOrEqual(85);
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expect(hr).toBeLessThanOrEqual(115);
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expect(h).toBeGreaterThanOrEqual(90);
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expect(h).toBeLessThanOrEqual(110);
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expect(r).toBeGreaterThanOrEqual(90);
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expect(r).toBeLessThanOrEqual(110);
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}
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});
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});
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describe('getParkFactor', () => {
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test('returns the row for known teams', () => {
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expect(pf.getParkFactor('NYY').hr).toBe(pf.PARK_FACTORS.NYY.hr);
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expect(pf.getParkFactor('COL').hr).toBeGreaterThan(120);
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});
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test('case-insensitive', () => {
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expect(pf.getParkFactor('nyy').hr).toBeGreaterThan(0);
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expect(pf.getParkFactor('Col')).toBe(pf.PARK_FACTORS.COL);
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});
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test('whitespace-tolerant', () => {
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expect(pf.getParkFactor(' COL ')).toBeTruthy();
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});
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test('returns null for unknown / empty', () => {
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expect(pf.getParkFactor('XYZ')).toBeNull();
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expect(pf.getParkFactor('')).toBeNull();
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expect(pf.getParkFactor(null)).toBeNull();
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expect(pf.getParkFactor(undefined)).toBeNull();
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});
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});
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describe('getParkFactorOrNeutral', () => {
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test('returns the row when known', () => {
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expect(pf.getParkFactorOrNeutral('NYY')).toBe(pf.PARK_FACTORS.NYY);
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});
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test('falls back to neutral 100s when unknown', () => {
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expect(pf.getParkFactorOrNeutral('XYZ')).toEqual({ hr: 100, h: 100, r: 100 });
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expect(pf.getParkFactorOrNeutral(null)).toEqual({ hr: 100, h: 100, r: 100 });
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});
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});
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describe('immutability', () => {
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test('PARK_FACTORS is frozen at the top level', () => {
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expect(Object.isFrozen(pf.PARK_FACTORS)).toBe(true);
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});
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test('NEUTRAL is frozen', () => {
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expect(Object.isFrozen(pf.NEUTRAL)).toBe(true);
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});
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});
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