d9fa804197
Extract the admin trackerHead <head> injection into a pure injectTrackerHead() and test it: a snippet containing $&/$$/backtick-dollar survives BYTE-FOR-BYTE (pins the function-replacer fix), empty/whitespace/undefined and a missing </head> leave the html unchanged. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
61 lines
2.5 KiB
TypeScript
61 lines
2.5 KiB
TypeScript
import { injectTrackerHead } from './inject-tracker-head.util';
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// Pins the public-share trackerHead injection invariant (ShareSeoController).
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// The admin snippet is trusted content and MUST land byte-for-byte before the
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// first </head>. The critical regression these tests guard is the function vs
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// string replacer: a string replacement interprets `$&`/`$$`/`` $` ``/`$'`
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// inside the snippet as substitution patterns and mangles the tracker. The
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// byte-for-byte test below FAILS on the old string-replacer implementation and
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// passes only with the function replacer.
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const HTML = '<html><head><title>t</title></head><body>b</body></html>';
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describe('injectTrackerHead', () => {
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it('inserts the snippet immediately before the first </head>', () => {
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const out = injectTrackerHead(HTML, '<script>ga()</script>');
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expect(out).toBe(
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'<html><head><title>t</title><script>ga()</script>\n</head><body>b</body></html>',
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);
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});
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it('inserts a snippet containing $& byte-for-byte (function replacer)', () => {
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const snippet = '<script>var a="$&";</script>';
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const out = injectTrackerHead(HTML, snippet);
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expect(out).toContain(`${snippet}\n</head>`);
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// The literal "$&" survives; a string replacer would have spliced in the
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// matched "</head>" here.
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expect(out).toContain('$&');
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expect(out).not.toContain('</head>"');
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});
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it('inserts a snippet containing $$, $` and $\' byte-for-byte', () => {
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// All four special replacement patterns in one snippet.
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const snippet = "<!-- $$ $` $' $& -->";
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const out = injectTrackerHead(HTML, snippet);
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expect(out).toContain(`${snippet}\n</head>`);
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});
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it('returns html unchanged for an empty trackerHead', () => {
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expect(injectTrackerHead(HTML, '')).toBe(HTML);
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});
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it('returns html unchanged for a whitespace-only trackerHead', () => {
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expect(injectTrackerHead(HTML, ' \n\t ')).toBe(HTML);
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});
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it('returns html unchanged for an undefined trackerHead', () => {
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expect(injectTrackerHead(HTML, undefined)).toBe(HTML);
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});
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it('returns html unchanged when there is no </head> marker', () => {
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const noHead = '<html><body>no head here</body></html>';
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expect(injectTrackerHead(noHead, '<script>ga()</script>')).toBe(noHead);
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});
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it('injects before only the FIRST </head> when several exist', () => {
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const twoHeads = '<head></head><head></head>';
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const out = injectTrackerHead(twoHeads, 'X');
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expect(out).toBe('<head>X\n</head><head></head>');
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});
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});
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