Fix - Pest helper syntax errors by sanitizing generated TestCase namespace segments

[tusharnain]

Description

This PR fixes a syntax error bug in the dynamically generated Pest helper file (storage/framework/testing/_pest.php).

When test configuration files or packages reside in subdirectories or contain characters like hyphens (-), dots (.), or start with digits, the extension generates invalid PHP namespace declarations. This causes IDE parser failures in tools like PHP Intelephense, PHP Tools, or PHPStan, breaking autocomplete for Pest's functional test helpers (beforeEach(), afterEach(), test(), and it()).

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The Problem & Cause

Pest test configurations are mapped to virtual TestCase classes containing the bound traits. These are written inside _pest.php to define the $this closure context for IDE parsing.

In src/features/pest.ts, the pestNamespace helper converted relative file paths directly to namespace segments:

const pestNamespace = (filePath: string): string => {
    const relative = filePath.replace(/^tests[/\\]?/, "");
    const segment = relative ? relative.replace(/[/\\]/g, "\\") : "Global";
    return `_Pest\\${segment}`;
};

If a test file path was e.g. vendor/_laravel_ide/discover-bf37f1dc35944596ec71c910bc1ca84f.php, it yielded:

namespace _Pest\vendor\_laravel_ide\discover-bf37f1dc35944596ec71c910bc1ca84f.php {
    class TestCase {
        use \Illuminate\Foundation\Testing\RefreshDatabase;
    }
}

PHP namespaces do not allow hyphens (-), dots (.), or starting segments with numbers. The above code causes parser crashes in the language server, disabling helper type-hints in the IDE.

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The Fix

We updated the pestNamespace function in src/features/pest.ts to sanitize each segment of the path:

1. Split the relative path by path separators (/ or \).
2. Replace all non-alphanumeric and non-underscore characters ([^a-zA-Z0-9_\x7f-\xff]) with underscores (_).
3. Prepend a leading underscore (_) if the segment begins with a digit (which is illegal for PHP identifiers).
4. Filter out empty segments and join them with \.

Before / After Example:

• File Path: vendor/_laravel_ide/discover-bf37f1dc35944596ec71c910bc1ca84f.php
• Before: _Pest\vendor\_laravel_ide\discover-bf37f1dc35944596ec71c910bc1ca84f.php (invalid PHP syntax)
• After: _Pest\vendor\_laravel_ide\discover_bf37f1dc35944596ec71c910bc1ca84f_php (valid PHP syntax)

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Benefits & Impact

• Restored Autocomplete: Prevents syntax errors in _pest.php, allowing IDE Language Servers to parse the helper correctly and restore auto-completions on $this context in Pest tests.
• Fully Compatible: Retains unique virtual namespaces per test file/path, ensuring proper trait imports mapping.
• Robust Identifier Generation: Safely handles file paths containing numbers, hyphens, and dot-extensions.