fix(tia): suppress PHPUnit XML coverage during recording (#1845)

When phpunit.xml has <coverage> and <source> sections, PHPUnit
auto-initializes its code coverage driver which takes over
xdebug's coverage APIs. TIA's recorder then gets empty data
from xdebug_get_code_coverage(), resulting in zero recorded
edges and no graph being saved.

Inject --no-coverage into the arguments when TIA enters its
own recording mode (not piggybacking on an explicit coverage
report). This tells PHPUnit to ignore XML-configured coverage
reports, leaving xdebug free for TIA's per-test recording.

Having <coverage> and <source> in phpunit.xml is standard for
any project that generates coverage reports. Without this fix,
users must manually pass --no-coverage alongside --tia, which
is an unnecessary footgun.

src/Plugins/Tia.php

@@ -1238,6 +1238,10 @@ final class Tia implements AddsOutput, HandlesArguments, HandlesOriginalArgument
             return $arguments;
         }
 
+        if (! $this->piggybackCoverage && ! in_array('--no-coverage', $arguments, true)) {
+            $arguments[] = '--no-coverage';
+        }
+
         if (Parallel::isEnabled()) {
             $this->purgeWorkerPartials();
 

tests/Features/Tia/CoveragePiggyback.php

@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+use Pest\Support\Coverage;
 use Tests\Fixtures\Tia\Project;
 
 afterEach(function (): void {
@@ -39,6 +40,44 @@ test('a plain run after a coverage run records the whole project scope', functio
         ->and($graph['files'])->toContain('app/Calculator.php');
 })->skipOnWindows();
 
+test('xml-configured coverage does not prevent tia recording', function (): void {
+    $project = Project::make('master');
+
+    $project->write('phpunit.xml', <<<'XML_WRAP'
+    <?xml version="1.0" encoding="UTF-8"?>
+    <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.0/phpunit.xsd"
+             bootstrap="vendor/autoload.php"
+             cacheDirectory=".phpunit.cache"
+             colors="true"
+             failOnRisky="true"
+             failOnWarning="false"
+    >
+      <testsuites>
+        <testsuite name="default">
+          <directory suffix="Test.php">./tests</directory>
+        </testsuite>
+      </testsuites>
+      <coverage>
+        <report>
+          <clover outputFile="coverage/clover.xml" />
+        </report>
+      </coverage>
+      <source>
+        <include>
+          <directory suffix=".php">./app</directory>
+        </include>
+      </source>
+    </phpunit>
+    XML_WRAP);
+
+    $result = $project->pest('--tia');
+
+    expect($result->exitCode)->toBe(0, $result->describe())
+        ->and($project->graphExists())->toBeTrue()
+        ->and(array_keys($project->graph()['edges']))->toEqualCanonicalizing(array_keys(Project::EDGES));
+})->skipOnWindows()->skip(! Coverage::isAvailable(), 'Coverage is not available');
+
 test('a coverage report leaves the edges of an existing graph alone', function (): void {
     $project = Project::make('master');
     $project->seed('master');