wdq

tests/Features/Tia/CoveragePiggyback.php

@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+use Tests\Fixtures\Tia\Project;
+
+afterEach(function (): void {
+    Project::destroyAll();
+});
+
+/*
+ * An active coverage report owns the coverage driver, so TIA cannot open a
+ * session of its own and has to piggyback on PHPUnit's — which is scoped to
+ * `phpunit.xml`'s <source>, not to the whole project. Edges recorded that way
+ * are missing every source file outside that scope, and a change to one of them
+ * would select nothing and replay a pass. Invariant 3 at its most dangerous.
+ *
+ * The rows below assert what a coverage run may and may not leave behind. They
+ * are deliberately silent about exit codes and result counts: `--coverage`
+ * itself fails on an interpreter with no driver, so only the graph's fate is
+ * the same everywhere.
+ */
+
+test('a coverage report does not found a dependency graph', function (array $arguments): void {
+    $project = Project::make('master');
+
+    $project->pest('--tia', ...$arguments);
+
+    expect($project->graphExists())->toBeFalse();
+})->with([
+    'pest coverage' => [['--coverage']],
+    'phpunit coverage report' => [['--coverage-text']],
+    'parallel' => [['--coverage', '--parallel', '--processes=2']],
+])->skipOnWindows();
+
+test('a plain run after a coverage run records the whole project scope', function (): void {
+    $project = Project::make('master');
+
+    $project->pest('--tia', '--coverage');
+    $project->pest('--tia');
+
+    $graph = $project->graph();
+
+    // Nothing to assert without a driver: there is no graph either way, and the
+    // point of the row is that the *plain* run is the one that founds it.
+    if ($graph === null) {
+        expect($project->graphExists())->toBeFalse();
+
+        return;
+    }
+
+    // Self-edges included — they are the first thing a coverage-scoped
+    // recording drops, since test files are not in <source>.
+    expect(array_keys($graph['edges']))->toEqualCanonicalizing(array_keys(Project::EDGES))
+        ->and($graph['files'])->toContain('tests/Unit/CalculatorTest.php')
+        ->and($graph['files'])->toContain('app/Calculator.php');
+})->skipOnWindows();
+
+test('a coverage report leaves the edges of an existing graph alone', function (): void {
+    $project = Project::make('master');
+    $project->seed('master');
+
+    $project->pest('--tia', '--coverage');
+    $delta = $project->delta();
+
+    expect($delta->edgesMoved())->toBeFalse($delta->summary())
+        ->and($delta->filesMoved())->toBeFalse($delta->summary())
+        ->and($delta->removed())->toBe(0, $delta->summary())
+        ->and($delta->added())->toBe(0, $delta->summary());
+})->skipOnWindows();