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backend/tests/Unit/TemplateSelectorTest.php

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+<?php
+
+namespace Tests\Unit;
+
+use App\Signature\TemplateSelector;
+use PHPUnit\Framework\TestCase;
+
+class TemplateSelectorTest extends TestCase
+{
+    private array $assignments = [
+        ['id' => 1, 'template_id' => 10, 'group_id' => 100, 'priority' => 10],  // agents
+        ['id' => 2, 'template_id' => 20, 'group_id' => 200, 'priority' => 100], // directeurs
+        ['id' => 3, 'template_id' => 30, 'group_id' => 300, 'priority' => 100], // même priorité, plus récent
+    ];
+
+    public function test_priorite_la_plus_haute_gagne(): void
+    {
+        $this->assertSame(20, (new TemplateSelector)->select($this->assignments, [100, 200], 99));
+    }
+
+    public function test_egalite_departagee_par_anciennete(): void
+    {
+        $this->assertSame(20, (new TemplateSelector)->select($this->assignments, [300, 200], 99));
+    }
+
+    public function test_template_par_defaut_hors_groupe(): void
+    {
+        $this->assertSame(99, (new TemplateSelector)->select($this->assignments, [555], 99));
+        $this->assertNull((new TemplateSelector)->select($this->assignments, [], null));
+    }
+}