livewire-material/tests/Feature/BreakpointsTest.php

<?php

use Illuminate\Support\Facades\File;

/**
 * Breakpoints are M3's window size classes and only those: compact below `medium`, then medium 600,
 * expanded 840, large 1200 and extra-large 1600 (docs/reference/m3/foundations.md § Layout,
 * foundations-supplement.md § Breakpoints). Tailwind is gone from the whole stack (plan step 39),
 * so a leftover `sm:` class or a media query at one of its screen widths no longer compiles to
 * nothing — a browser just as silently ignores the invalid class or the wrong-width rule, so the
 * mistake is exactly as easy to miss. These two scans are the guard: one for a Tailwind-shaped
 * prefix (a habit, or an example pasted from elsewhere), one for the media queries a stylesheet or
 * a script writes by hand.
 *
 * @return list<SplFileInfo>
 */
function breakpointSources(): array
{
    return collect(['views', 'css', 'js'])
        ->flatMap(fn (string $directory): array => File::allFiles(__DIR__.'/../../resources/'.$directory))
        ->filter(fn (SplFileInfo $file): bool => in_array($file->getExtension(), ['php', 'css', 'js'], true))
        ->values()
        ->all();
}

/**
 * Every line of a file that matches, as `path:line: the line`.
 *
 * @return list<string>
 */
function breakpointOffenders(SplFileInfo $file, string $pattern): array
{
    $lines = preg_split('/\R/', $file->getContents());

    return collect($lines)
        ->filter(fn (string $line): bool => preg_match($pattern, $line) === 1)
        ->map(fn (string $line, int $index): string => $file->getRelativePathname().':'.($index + 1).': '.trim($line))
        ->values()
        ->all();
}

it('writes no Tailwind breakpoint prefix in any view, stylesheet or script', function () {
    // A prefix, not a name: `--radius-corner-sm:` and slider.js's `sm: { corner: 8 }` are excluded
    // by the character before and the one after, and `@md:` is a container query, a different
    // thing — a component sized by the room it has, not by the window.
    $pattern = '/(?<![\w@-])(?:max-)?(?:sm|md|lg|xl|2xl):[a-z\[(-]/';

    $offenders = collect(breakpointSources())
        ->flatMap(fn (SplFileInfo $file): array => breakpointOffenders($file, $pattern))
        ->values();

    expect($offenders->all())->toBe([]);
});

it('writes no media query at a Tailwind screen width', function () {
    // 40rem/640px, 48rem/768px, 64rem/1024px, 80rem/1280px and the 39.99rem that stood for "below
    // 640" — none of them is an M3 boundary. The M3 ones are 37.5, 52.5, 75 and 100rem, and a
    // script asks resources/js/breakpoints.js for them instead of writing its own string.
    $widths = '/(?<![\d.])(?:40|48|64|80|39\.99)rem|(?<![\d.])(?:640|768|1024|1280)px/';

    $offenders = collect(breakpointSources())
        ->flatMap(function (SplFileInfo $file) use ($widths): array {
            // Only the condition of a query, so `max-width: min(40rem, 70dvh)` — a real width, not
            // a breakpoint — and a 640px cap on a bottom sheet are left alone.
            preg_match_all('/@(?:media|container)\b[^{]*|matchMedia\(\s*[\'"`][^\'"`]*/', $file->getContents(), $matches);

            return collect($matches[0])
                ->filter(fn (string $condition): bool => preg_match($widths, $condition) === 1)
                ->map(fn (string $condition): string => $file->getRelativePathname().': '.trim($condition))
                ->values()
                ->all();
        })
        ->values();

    expect($offenders->all())->toBe([]);
});

it('scans the showcase example heredocs too, where the package teaches its own markup', function () {
    $sections = collect(breakpointSources())
        ->filter(fn (SplFileInfo $file): bool => str_contains($file->getRelativePathname(), 'showcase'.DIRECTORY_SEPARATOR.'sections'))
        ->filter(fn (SplFileInfo $file): bool => str_contains($file->getContents(), "<<<'BLADE'"));

    // Every section still teaches its examples through a heredoc nested inside an @php block
    // (plan step 38 rewrote what is inside them, not the mechanism), so the two scans above —
    // which read a file's raw text rather than its parsed Blade or PHP — still reach them.
    expect($sections)->not->toBeEmpty();

    // The premise itself, proven on a fixture now that plan step 38 has cleared every Tailwind
    // breakpoint prefix out of the showcase (its own goal, so production content can no longer
    // carry one): a real file, shaped exactly like a showcase section (an outer heredoc nesting an
    // inner one, `@php … <<<'BLADE' … BLADE, … @endphp`), still gives up a prefix hiding two
    // heredocs deep to the same pattern and helper the first test above uses.
    $directory = sys_get_temp_dir().'/breakpoint-heredoc-probe-'.uniqid();
    File::ensureDirectoryExists($directory);
    File::put($directory.'/probe.blade.php', <<<'OUTER'
        @php
            $examples = [
                'Probe' => <<<'BLADE'
                    <div class="md:flex"></div>
                    BLADE,
            ];
        @endphp
        OUTER);

    try {
        $pattern = '/(?<![\w@-])(?:max-)?(?:sm|md|lg|xl|2xl):[a-z\[(-]/';
        $probe = File::allFiles($directory)[0];

        expect(breakpointOffenders($probe, $pattern))->not->toBeEmpty();
    } finally {
        File::deleteDirectory($directory);
    }
});