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tests/Feature/AssignmentTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Consultant;
+use App\Models\DataCentre;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AssignmentTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->seedRolesAndPermissions();
+    }
+
+    public function test_jpp_can_assign_consultant_to_data_centre(): void
+    {
+        $jpp = $this->makeUserWithRole('Pegawai JPP');
+        $dc = DataCentre::factory()->create();
+        $consultant = Consultant::factory()->create();
+
+        $this->actingAs($jpp)->post(route('data-centres.assign', $dc), [
+            'consultant_id' => $consultant->id,
+            'start_date' => now()->toDateString(),
+            'reason' => 'Penugasan awal',
+        ])->assertRedirect();
+
+        $dc->refresh();
+        $this->assertEquals($consultant->id, $dc->current_consultant_id);
+        $this->assertDatabaseHas('data_centre_consultant_assignments', [
+            'data_centre_id' => $dc->id,
+            'consultant_id' => $consultant->id,
+            'is_active' => true,
+        ]);
+    }
+
+    public function test_only_one_active_consultant_per_data_centre(): void
+    {
+        $jpp = $this->makeUserWithRole('Pegawai JPP');
+        $dc = DataCentre::factory()->create();
+        $first = Consultant::factory()->create();
+        $second = Consultant::factory()->create();
+
+        $this->actingAs($jpp)->post(route('data-centres.assign', $dc), [
+            'consultant_id' => $first->id,
+        ]);
+
+        // Tugaskan perunding kedua — penugasan pertama mesti ditamatkan.
+        $this->actingAs($jpp)->post(route('data-centres.assign', $dc), [
+            'consultant_id' => $second->id,
+            'reason' => 'Tukar perunding',
+        ]);
+
+        $dc->refresh();
+        $this->assertEquals($second->id, $dc->current_consultant_id);
+
+        // Hanya satu penugasan aktif.
+        $activeCount = $dc->assignments()->where('is_active', true)->count();
+        $this->assertEquals(1, $activeCount);
+
+        // Penugasan pertama ditamatkan (ada end_date).
+        $this->assertDatabaseHas('data_centre_consultant_assignments', [
+            'data_centre_id' => $dc->id,
+            'consultant_id' => $first->id,
+            'is_active' => false,
+        ]);
+        // Sejarah dikekalkan: dua rekod penugasan.
+        $this->assertEquals(2, $dc->assignments()->count());
+    }
+}