test: add the behavioral spec suites (pilot + ten domains)

98 tests pinning observable behavior ahead of the authorship rewrite.

tests/Feature/PilotSpec/ZzDatabaseRefusalTest.php

@@ -0,0 +1,37 @@
+<?php
+
+// Pilot behavioural suite — the non-empty-database refusal.
+// Kept in its own file, alphabetically last: exercising the refusal swaps the
+// application's active database connection for the remainder of the PHP
+// process, which would poison any test file running after it.
+
+use function Pest\Laravel\postJson;
+
+beforeEach(function () {
+    Artisan::call('db:seed', ['--class' => 'DatabaseSeeder', '--force' => true]);
+    $this->envBackup = file_get_contents(base_path('.env'));
+});
+
+afterEach(function () {
+    file_put_contents(base_path('.env'), $this->envBackup);
+});
+
+it('refuses a database that already contains data, without touching the environment file', function () {
+    $path = storage_path('framework/testing/pilot-nonempty.sqlite');
+    @mkdir(dirname($path), 0775, true);
+    @unlink($path);
+    $db = new SQLite3($path);
+    $db->exec('CREATE TABLE users (id INTEGER PRIMARY KEY)');
+    $db->close();
+
+    $response = postJson('/api/v1/installation/database/config', [
+        'app_url' => 'http://pilot.test',
+        'database_connection' => 'sqlite',
+        'database_name' => $path,
+    ])->assertOk()->json();
+
+    expect($response['error'])->toBe('database_should_be_empty');
+    expect(file_get_contents(base_path('.env')))->toBe($this->envBackup);
+
+    @unlink($path);
+});