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test(svg): export and add tests for deterministicRandom() helper #1937

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Merged
JhaSourav07 merged 1 commit into from
May 31, 2026
+34 −12
Merged

test(svg): export and add tests for deterministicRandom() helper #1937

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22 changes: 22 additions & 0 deletions lib/svg/generator.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import {
escapeXML,
getSizeScale,
truncateUsername,
deterministicRandom,
} from './generator';
import type { BadgeParams, ContributionCalendar, StreakStats, MonthlyStats } from '../../types';
import { hexColor } from './sanitizer';
Expand Down Expand Up @@ -1444,3 +1445,24 @@ describe('Radar Scan Line Animation Alignment', () => {
expect(geometryLong).toEqual(geometryBaseline);
});
});
describe('deterministicRandom', () => {
it('returns the same value for the same seed (determinism)', () => {
const seed = 'test-seed-42';
expect(deterministicRandom(seed)).toBe(deterministicRandom(seed));
});

it('result is always in the range [0, 1)', () => {
const seeds = ['hello', 'world', '', 'abc:def:0:offsetX', '12345'];
for (const seed of seeds) {
const result = deterministicRandom(seed);
expect(result).toBeGreaterThanOrEqual(0);
expect(result).toBeLessThan(1);
}
});

it('returns different values for different seeds', () => {
const a = deterministicRandom('seed-alpha');
const b = deterministicRandom('seed-beta');
expect(a).not.toBe(b);
});
});
24 changes: 12 additions & 12 deletions lib/svg/generator.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ export function truncateUsername(username: string): string {
return username.length > 12 ? `${username.slice(0, 12)}...` : username;
}

function deterministicRandom(seed: string): number {
export function deterministicRandom(seed: string): number {
let hash = 2166136261;
for (let i = 0; i < seed.length; i++) {
hash ^= seed.charCodeAt(i);
Expand Down Expand Up @@ -930,13 +930,13 @@ export function generateWrappedSVG(

.title-user { font-family: ${selectedFont || '"Syncopate", sans-serif'}; font-weight: 700; font-size: 13px; letter-spacing: 2.5px; opacity: 0.85; }
.title-wrapped { font-family: ${selectedFont || '"Syncopate", sans-serif'}; font-weight: 700; font-size: 13px; letter-spacing: 2.5px; }

.total-commits { font-family: ${statsFont}; font-size: 46px; font-weight: 700; }
.total-label { font-family: "Roboto", sans-serif; font-size: 9.5px; font-weight: 700; letter-spacing: 1.5px; opacity: 0.5; }

.grid-label { font-family: "Roboto", sans-serif; font-size: 9px; font-weight: 700; letter-spacing: 1.5px; opacity: 0.5; }
.grid-val { font-family: ${statsFont}; font-size: 14.5px; font-weight: 600; }

.scan-line {
animation: scan-sweep var(--scan-speed, 8s) linear infinite;
transform-box: fill-box;
Expand Down Expand Up @@ -1085,11 +1085,11 @@ function generateAutoThemeMonthlySVG(stats: MonthlyStats, params: BadgeParams):
${googleFontsImport}
:root { --cp-bg: #${light.bg}; --cp-text: #${light.text}; --cp-accent: #${light.accent}; --cp-negative: #${light.negative || 'cf222e'}; }
@media (prefers-color-scheme: dark) { :root { --cp-bg: #${dark.bg}; --cp-text: #${dark.text}; --cp-accent: #${dark.accent}; --cp-negative: #${dark.negative || 'f85149'}; } }
.cp-bg-fill { fill: var(--cp-bg); }
.cp-text-fill { fill: var(--cp-text); color: var(--cp-text); }
.cp-bg-fill { fill: var(--cp-bg); }
.cp-text-fill { fill: var(--cp-text); color: var(--cp-text); }
.cp-accent-fill { fill: var(--cp-accent); color: var(--cp-accent); }
.cp-delta-fill { fill: ${stats.deltaAbsolute >= 0 ? 'var(--cp-accent)' : 'var(--cp-negative)'}; }

.title { font-family: ${selectedFont || '"Syncopate", sans-serif'}; fill: var(--cp-text); font-size: 14px; letter-spacing: 2px; font-weight: 400; opacity: 0.8; }
.stats { font-family: ${statsFont}; fill: var(--cp-accent); font-size: 36px; font-weight: 600; letter-spacing: 0; }
.label { font-family: "Roboto", sans-serif; fill: var(--cp-text); font-size: 10px; font-weight: 400; letter-spacing: 1px; opacity: 0.7; }
Expand Down Expand Up @@ -1776,7 +1776,7 @@ export function generateVersusSVG(
${renderDefs(sf, params)}
${renderStyle(selectedFont, statsFont, googleFontsImport, text, accent, sf, bg)}
<rect width="${W}" height="${H}" rx="${radius}" fill="${params.hideBackground ? 'transparent' : bg}" />

<g transform="translate(0, 0)">
<g transform="translate(0, ${Math.round(20 * sf)})">${towers1}</g>
${renderIsometricLabels(calendar1, params, text, sf)}
Expand All @@ -1790,7 +1790,7 @@ export function generateVersusSVG(
</g>

<line x1="${singleW}" y1="${s(40)}" x2="${singleW}" y2="${H - s(40)}" stroke="${text}" stroke-opacity="0.2" stroke-width="2" stroke-dasharray="4 4" />

<g transform="translate(${singleW}, ${H / 2})">
<circle cx="0" cy="0" r="${s(24)}" fill="${bg}" stroke="${accent}" stroke-width="2" />
<text x="0" y="${s(6)}" text-anchor="middle" font-family="${statsFont}" fill="${accent}" font-size="${s(16)}" font-weight="bold">VS</text>
Expand Down Expand Up @@ -1911,7 +1911,7 @@ function generateAutoThemeVersusSVG(
<title>CommitPulse Versus Stats: ${safeUser1} vs ${safeUser2}</title>
<desc>${safeUser1} has ${stats1.totalContributions} ${unit}. ${safeUser2} has ${stats2.totalContributions} ${unit}.</desc>
${renderDefs(sf, params)}

<style>
@import url('https://fonts.googleapis.com/css2?family=Fira+Code&amp;family=JetBrains+Mono&amp;family=Roboto&amp;family=Syncopate:wght@400;700&amp;family=Space+Grotesk:wght@400;500;600;700&amp;display=swap');
:root { --cp-bg: #${light.bg}; --cp-text: #${light.text}; --cp-accent: #${light.accent}; --cp-label-fill: ${lightLabelFill}; --cp-label-opacity: ${lightLabelOpacity}; }
Expand Down Expand Up @@ -1944,7 +1944,7 @@ function generateAutoThemeVersusSVG(
</style>

<rect width="${W}" height="${H}" rx="${radius}" class="${params.hideBackground ? '' : 'cp-bg-fill'}" fill="${params.hideBackground ? 'transparent' : ''}" />

<g transform="translate(0, 0)">
<g transform="translate(0, ${Math.round(20 * sf)})">${towers1}</g>
${renderIsometricLabels(calendar1, params, '', sf)}
Expand All @@ -1958,7 +1958,7 @@ function generateAutoThemeVersusSVG(
</g>

<line x1="${singleW}" y1="${s(40)}" x2="${singleW}" y2="${H - s(40)}" stroke="var(--cp-text)" stroke-opacity="0.2" stroke-width="2" stroke-dasharray="4 4" />

<g transform="translate(${singleW}, ${H / 2})">
<circle cx="0" cy="0" r="${s(24)}" class="cp-bg-fill" stroke="var(--cp-accent)" stroke-width="2" />
<text x="0" y="${s(6)}" text-anchor="middle" font-family="${statsFont}" class="cp-accent-fill" font-size="${s(16)}" font-weight="bold">VS</text>
Expand Down
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