55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
import test from 'node:test';
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import assert from 'node:assert/strict';
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import {
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ENVIRONMENT_ISLANDS,
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environmentWindAt,
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velocityWithEnvironment,
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} from '../src/environment-physics.js';
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test('environment exposes collidable island geometry', () => {
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assert.equal(ENVIRONMENT_ISLANDS.length, 2);
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for (const island of ENVIRONMENT_ISLANDS) {
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assert.ok(island.radius > 0);
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assert.ok(island.turbulenceRadius > island.radius);
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}
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});
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test('ambient wind changes over time and remains bounded', () => {
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const first = environmentWindAt({ x: 1200, y: 1200, timeMs: 0 });
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const later = environmentWindAt({ x: 1200, y: 1200, timeMs: 18000 });
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assert.ok(first.strength > 5 && first.strength < 30);
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assert.ok(later.strength > 5 && later.strength < 30);
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assert.notDeepEqual(
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[Math.round(first.x * 100), Math.round(first.y * 100)],
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[Math.round(later.x * 100), Math.round(later.y * 100)],
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);
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});
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test('islands produce a local turbulence contribution', () => {
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const island = ENVIRONMENT_ISLANDS[0];
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const near = environmentWindAt({
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x: island.x + island.radius + 20,
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y: island.y,
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timeMs: 6000,
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});
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const far = environmentWindAt({
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x: island.x + island.turbulenceRadius + 300,
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y: island.y,
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timeMs: 6000,
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});
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assert.notEqual(
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Math.round(near.strength * 100),
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Math.round(far.strength * 100),
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);
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});
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test('environment velocity adds wind according to exposure', () => {
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const result = velocityWithEnvironment(100, -20, { x: 12, y: 8 }, 0.5);
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assert.equal(result.x, 106);
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assert.equal(result.y, -16);
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});
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