Bagian 1: Perancangan Sistem

<?php

namespace App\Exceptions;

use App\Models\Product;
use RuntimeException;

class InsufficientStockException extends RuntimeException
{
    public function __construct(
        public readonly Product $product,
        public readonly int $requested,
    ) {
        parent::__construct(sprintf(
            'Stok %s (%s) tidak cukup: tersedia %d %s, diminta %d %s.',
            $product->name,
            $product->sku,
            $product->stock,
            $product->unit,
            $requested,
            $product->unit,
        ));
    }
}

<?php

namespace App\Http\Controllers;

use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class AuthController extends Controller
{
    public function showLogin(): View
    {
        return view('auth.login');
    }

    public function login(Request $request): RedirectResponse
    {
        $credentials = $request->validate([
            'email' => ['required', 'email'],
            'password' => ['required'],
        ]);

        if (Auth::attempt($credentials)) {
            $request->session()->regenerate();

            return redirect()->intended(route('products.index'));
        }

        return back()
            ->withErrors(['email' => 'Email atau password salah.'])
            ->onlyInput('email');
    }

    public function logout(Request $request): RedirectResponse
    {
        Auth::logout();

        $request->session()->invalidate();
        $request->session()->regenerateToken();

        return redirect()->route('login');
    }
}

<?php

namespace App\Http\Controllers;

abstract class Controller
{
    //
}

<?php

namespace App\Http\Controllers;

use App\Http\Requests\ProductStoreRequest;
use App\Http\Requests\ProductUpdateRequest;
use App\Models\Category;
use App\Models\Product;
use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

class ProductController extends Controller
{
    public function index(Request $request): View
    {
        $products = Product::query()
            ->with('category')
            ->search($request->query('q'))
            ->ofCategory($request->query('category'))
            ->stockBetween($request->query('stock_min'), $request->query('stock_max'))
            ->when(
                $request->query('critical') === '1',
                fn ($query) => $query->critical(),
            )
            ->orderBy('name')
            ->paginate(10)
            ->withQueryString();

        return view('products.index', [
            'products' => $products,
            'categories' => Category::orderBy('name')->get(),
            'filters' => $request->only(['q', 'category', 'stock_min', 'stock_max', 'critical']),
        ]);
    }

    public function create(): View
    {
        return view('products.create', [
            'categories' => Category::orderBy('name')->get(),
        ]);
    }

    public function store(ProductStoreRequest $request): RedirectResponse
    {
        $product = Product::create([
            ...$request->validated(),
            // Stok awal selalu 0: angka hanya boleh berubah lewat transaksi.
            'stock' => 0,
        ]);

        return redirect()
            ->route('products.show', $product)
            ->with('status', "Produk {$product->name} berhasil disimpan.");
    }

    public function show(Product $product): View
    {
        $movements = $product->movements()
            ->with('user')
            ->orderByDesc('id')
            ->limit(10)
            ->get();

        return view('products.show', [
            'product' => $product->load('category'),
            'movements' => $movements,
        ]);
    }

    public function edit(Product $product): View
    {
        return view('products.edit', [
            'product' => $product->load('category'),
            'categories' => Category::orderBy('name')->get(),
        ]);
    }

    public function update(ProductUpdateRequest $request, Product $product): RedirectResponse
    {
        $product->update($request->validated());

        return redirect()
            ->route('products.show', $product)
            ->with('status', "Produk {$product->name} berhasil diperbarui.");
    }

    public function destroy(Product $product): RedirectResponse
    {
        $name = $product->name;
        $product->delete();

        return redirect()
            ->route('products.index')
            ->with('status', "Produk {$name} beserta riwayat pergerakannya berhasil dihapus.");
    }
}

<?php

namespace App\Http\Controllers;

use App\Models\Product;
use Illuminate\Contracts\View\View;

class ReportController extends Controller
{
    /**
     * Laporan stok kritis: produk dengan stok <= stok minimum.
     */
    public function lowStock(): View
    {
        $products = Product::query()
            ->with('category')
            ->critical()
            ->orderBy('name')
            ->paginate(10);

        return view('reports.low-stock', [
            'products' => $products,
        ]);
    }
}

<?php

namespace App\Http\Controllers;

use App\Exceptions\InsufficientStockException;
use App\Http\Requests\StockMovementRequest;
use App\Models\Product;
use App\Models\StockMovement;
use App\Services\StockService;
use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;

class StockMovementController extends Controller
{
    public function index(): View
    {
        $movements = StockMovement::query()
            ->with(['product.category', 'user'])
            ->orderByDesc('id')
            ->paginate(15);

        return view('movements.index', [
            'movements' => $movements,
        ]);
    }

    public function create(): View
    {
        return view('movements.create', [
            'products' => Product::orderBy('name')->get(),
            'preselected' => request('product'),
        ]);
    }

    public function store(
        StockMovementRequest $request,
        StockService $service,
    ): RedirectResponse {
        $data = $request->validated();

        $product = Product::findOrFail($data['product_id']);

        try {
            $service->recordMovement(
                $product,
                $data['type'],
                (int) $data['quantity'],
                $data['note'] ?? null,
                $request->user(),
                $data['movement_date'],
            );
        } catch (InsufficientStockException $exception) {
            return redirect()
                ->back()
                ->withInput()
                ->withErrors(['quantity' => $exception->getMessage()]);
        }

        return redirect()
            ->route('products.show', $product)
            ->with('status', "Transaksi stok {$product->name} berhasil dicatat.");
    }
}

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class ProductStoreRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /**
     * @return array<string, array<int, string>>
     */
    public function rules(): array
    {
        return [
            'sku' => ['required', 'string', 'max:32', 'unique:products,sku'],
            'name' => ['required', 'string', 'max:100'],
            'category_id' => ['required', 'integer', 'exists:categories,id'],
            'unit' => ['required', 'string', 'max:20'],
            'min_stock' => ['required', 'integer', 'min:0'],
            'price' => ['required', 'numeric', 'min:0'],
        ];
    }

    /**
     * @return array<string, string>
     */
    public function attributes(): array
    {
        return [
            'sku' => 'SKU',
            'category_id' => 'kategori',
            'unit' => 'satuan',
            'min_stock' => 'stok minimum',
            'price' => 'harga',
        ];
    }
}

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class ProductUpdateRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /**
     * @return array<string, array<int, string>>
     */
    public function rules(): array
    {
        return [
            'sku' => [
                'required', 'string', 'max:32',
                Rule::unique('products', 'sku')->ignore($this->route('product')),
            ],
            'name' => ['required', 'string', 'max:100'],
            'category_id' => ['required', 'integer', 'exists:categories,id'],
            'unit' => ['required', 'string', 'max:20'],
            'min_stock' => ['required', 'integer', 'min:0'],
            'price' => ['required', 'numeric', 'min:0'],
        ];
    }

    /**
     * @return array<string, string>
     */
    public function attributes(): array
    {
        return [
            'sku' => 'SKU',
            'category_id' => 'kategori',
            'unit' => 'satuan',
            'min_stock' => 'stok minimum',
            'price' => 'harga',
        ];
    }
}

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class StockMovementRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /**
     * @return array<string, array<int, string>>
     */
    public function rules(): array
    {
        return [
            'product_id' => ['required', 'integer', 'exists:products,id'],
            'type' => ['required', 'in:in,out'],
            'quantity' => ['required', 'integer', 'min:1'],
            'note' => ['nullable', 'string', 'max:255'],
            'movement_date' => ['required', 'date'],
        ];
    }

    /**
     * @return array<string, string>
     */
    public function attributes(): array
    {
        return [
            'product_id' => 'produk',
            'type' => 'jenis transaksi',
            'quantity' => 'jumlah',
            'movement_date' => 'tanggal transaksi',
        ];
    }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Category extends Model
{
    protected $fillable = ['name', 'description'];

    public function products(): HasMany
    {
        return $this->hasMany(Product::class);
    }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Product extends Model
{
    protected $fillable = [
        'sku',
        'name',
        'category_id',
        'unit',
        'stock',
        'min_stock',
        'price',
    ];

    protected function casts(): array
    {
        return [
            'category_id' => 'integer',
            'stock' => 'integer',
            'min_stock' => 'integer',
            'price' => 'decimal:2',
        ];
    }

    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }

    public function movements(): HasMany
    {
        return $this->hasMany(StockMovement::class);
    }

    /**
     * Cari produk berdasarkan nama atau SKU (partial match).
     */
    public function scopeSearch(Builder $query, ?string $keyword): Builder
    {
        return $query->when(filled($keyword), function (Builder $query) use ($keyword) {
            $keyword = trim($keyword);

            $query->where(function (Builder $query) use ($keyword) {
                $query->where('name', 'like', "%{$keyword}%")
                    ->orWhere('sku', 'like', "%{$keyword}%");
            });
        });
    }

    /**
     * Filter produk milik satu kategori.
     */
    public function scopeOfCategory(Builder $query, ?int $categoryId): Builder
    {
        return $query->when(filled($categoryId), function (Builder $query) use ($categoryId) {
            $query->where('category_id', $categoryId);
        });
    }

    /**
     * Filter produk pada rentang stok [min, max].
     */
    public function scopeStockBetween(Builder $query, ?int $min, ?int $max): Builder
    {
        return $query
            ->when(filled($min), fn (Builder $query) => $query->where('stock', '>=', $min))
            ->when(filled($max), fn (Builder $query) => $query->where('stock', '<=', $max));
    }

    /**
     * Produk dengan stok kritis: stok saat ini <= stok minimum.
     */
    public function scopeCritical(Builder $query): Builder
    {
        return $query->whereColumn('stock', '<=', 'min_stock');
    }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class StockMovement extends Model
{
    public const TYPE_IN = 'in';

    public const TYPE_OUT = 'out';

    protected $fillable = [
        'product_id',
        'type',
        'quantity',
        'note',
        'user_id',
        'movement_date',
    ];

    protected function casts(): array
    {
        return [
            'product_id' => 'integer',
            'quantity' => 'integer',
            'user_id' => 'integer',
            'movement_date' => 'date',
        ];
    }

    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class);
    }

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }
}

<?php

namespace App\Services;

use App\Exceptions\InsufficientStockException;
use App\Models\Product;
use App\Models\StockMovement;
use App\Models\User;
use Illuminate\Support\Facades\DB;

class StockService
{
    /**
     * Catat satu pergerakan stok dan perbarui stok produk secara atomik.
     *
     * Seluruh operasi berjalan di dalam DB::transaction() sehingga baris
     * pada stock_movements dan angka products.stock selalu konsisten:
     * keduanya tersimpan bersama atau keduanya dibatalkan bersama.
     */
    public function recordMovement(
        Product $product,
        string $type,
        int $quantity,
        ?string $note = null,
        ?User $user = null,
        ?string $movementDate = null,
    ): StockMovement {
        return DB::transaction(function () use ($product, $type, $quantity, $note, $user, $movementDate): StockMovement {
            // Kunci baris produk agar dua proses tidak menghitung stok
            // dari angka yang sama secara bersamaan (race condition).
            $locked = Product::query()
                ->whereKey($product->id)
                ->lockForUpdate()
                ->firstOrFail();

            if ($type === StockMovement::TYPE_OUT && $locked->stock < $quantity) {
                throw new InsufficientStockException($locked, $quantity);
            }

            $movement = $locked->movements()->create([
                'type' => $type,
                'quantity' => $quantity,
                'note' => $note,
                'user_id' => $user?->id,
                'movement_date' => $movementDate ?? now()->toDateString(),
            ]);

            $locked->stock = $type === StockMovement::TYPE_IN
                ? $locked->stock + $quantity
                : $locked->stock - $quantity;
            $locked->save();

            return $movement;
        });
    }
}

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('categories', function (Blueprint $table) {
            $table->id();
            $table->string('name', 60)->unique();
            $table->string('description', 255)->nullable();
            $table->timestamps();
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('categories');
    }
};

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('products', function (Blueprint $table) {
            $table->id();
            $table->string('sku', 32)->unique();
            $table->string('name', 100);
            $table->foreignId('category_id')
                ->constrained()
                ->restrictOnDelete();
            $table->string('unit', 20)->default('pcs');
            $table->unsignedInteger('stock')->default(0);
            $table->unsignedInteger('min_stock')->default(0);
            $table->decimal('price', 12, 2)->default(0);
            $table->timestamps();
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('products');
    }
};

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up(): void
    {
        Schema::create('stock_movements', function (Blueprint $table) {
            $table->id();
            $table->foreignId('product_id')
                ->constrained()
                ->cascadeOnDelete();
            $table->enum('type', ['in', 'out']);
            $table->unsignedInteger('quantity');
            $table->string('note', 255)->nullable();
            $table->foreignId('user_id')
                ->nullable()
                ->constrained()
                ->nullOnDelete();
            $table->date('movement_date');
            $table->timestamps();

            $table->index(['product_id', 'id']);
            $table->index(['type', 'movement_date']);
        });
    }

    public function down(): void
    {
        Schema::dropIfExists('stock_movements');
    }
};

<?php

namespace Database\Seeders;

use App\Models\Category;
use App\Models\Product;
use App\Models\StockMovement;
use App\Models\User;
use App\Services\StockService;
use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\Hash;

class DatabaseSeeder extends Seeder
{
    public function run(): void
    {
        $budi = User::create([
            'name' => 'Budi Santoso',
            'email' => '[email protected]',
            'password' => Hash::make('password'),
        ]);

        $elektronik = Category::create([
            'name' => 'Elektronik',
            'description' => 'Peralatan elektronik kantor',
        ]);

        $alatTulis = Category::create([
            'name' => 'Alat Tulis',
            'description' => 'Kebutuhan alat tulis kantor',
        ]);

        $service = app(StockService::class);

        $mouse = Product::create([
            'sku' => 'ELK-001',
            'name' => 'Mouse Wireless M1',
            'category_id' => $elektronik->id,
            'unit' => 'pcs',
            'stock' => 0,
            'min_stock' => 5,
            'price' => 85000,
        ]);

        $tinta = Product::create([
            'sku' => 'ELK-002',
            'name' => 'Tinta Printer Hitam',
            'category_id' => $elektronik->id,
            'unit' => 'botol',
            'stock' => 0,
            'min_stock' => 8,
            'price' => 120000,
        ]);

        $kertas = Product::create([
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 80gsm',
            'category_id' => $alatTulis->id,
            'unit' => 'rim',
            'stock' => 0,
            'min_stock' => 10,
            'price' => 55000,
        ]);

        $service->recordMovement($mouse, StockMovement::TYPE_IN, 20, 'Stok pembukaan', $budi, '2026-01-02');
        $service->recordMovement($mouse, StockMovement::TYPE_OUT, 3, 'Peminjaman ruang meeting', $budi, '2026-01-05');
        $service->recordMovement($tinta, StockMovement::TYPE_IN, 10, 'Stok pembukaan', $budi, '2026-01-02');
        $service->recordMovement($tinta, StockMovement::TYPE_OUT, 6, 'Penggantian tinta printer lantai 2', $budi, '2026-01-06');
        $service->recordMovement($kertas, StockMovement::TYPE_IN, 15, 'Stok pembukaan', $budi, '2026-01-02');
    }
}

<?php

use App\Http\Controllers\AuthController;
use App\Http\Controllers\ProductController;
use App\Http\Controllers\ReportController;
use App\Http\Controllers\StockMovementController;
use Illuminate\Support\Facades\Route;

Route::get('/', fn () => redirect()->route('products.index'))->name('home');

Route::middleware('guest')->group(function () {
    Route::get('login', [AuthController::class, 'showLogin'])->name('login');
    Route::post('login', [AuthController::class, 'login'])->name('login.attempt');
});

Route::post('logout', [AuthController::class, 'logout'])
    ->middleware('auth')
    ->name('logout');

Route::middleware('auth')->group(function () {
    Route::resource('products', ProductController::class);

    Route::get('movements', [StockMovementController::class, 'index'])
        ->name('movements.index');
    Route::get('movements/create', [StockMovementController::class, 'create'])
        ->name('movements.create');
    Route::post('movements', [StockMovementController::class, 'store'])
        ->name('movements.store');

    Route::get('reports/low-stock', [ReportController::class, 'lowStock'])
        ->name('reports.low-stock');
});

<?php

namespace Tests\Feature;

use App\Models\User;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class AuthTest extends TestCase
{
    use RefreshDatabase;

    public function test_login_berhasil_dan_gagal(): void
    {
        User::factory()->create([
            'name' => 'Budi Santoso',
            'email' => '[email protected]',
            'password' => bcrypt('password-rahasia'),
        ]);

        // Kredensial salah: kembali dengan error.
        $this->from(route('login'))
            ->post(route('login.attempt'), [
                'email' => '[email protected]',
                'password' => 'salah',
            ])
            ->assertSessionHasErrors('email');

        // Kredensial benar: masuk dan diarahkan ke daftar produk.
        $this->post(route('login.attempt'), [
            'email' => '[email protected]',
            'password' => 'password-rahasia',
        ])
        ->assertRedirect(route('products.index'));

        $this->assertAuthenticated();
    }
}

<?php

namespace Tests\Feature;

use Tests\TestCase;

class ExampleTest extends TestCase
{
    /**
     * Halaman depan cukup meneruskan pengunjung ke daftar produk;
     * dari sana middleware auth yang meneruskan tamu ke halaman login.
     */
    public function test_halaman_depan_meneruskan_ke_daftar_produk(): void
    {
        $this->get('/')
            ->assertRedirect(route('products.index'));
    }
}

<?php

namespace Tests\Feature;

use App\Models\Category;
use App\Models\Product;
use App\Models\User;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class ProductCrudTest extends TestCase
{
    use RefreshDatabase;

    private function login(): User
    {
        $user = User::factory()->create([
            'name' => 'Budi Santoso',
            'email' => '[email protected]',
        ]);

        $this->actingAs($user);

        return $user;
    }

    private function category(): Category
    {
        return Category::create(['name' => 'Alat Tulis']);
    }

    public function test_tamu_diarahkan_ke_halaman_login(): void
    {
        $this->get(route('products.index'))
            ->assertRedirect(route('login'));
    }

    public function test_pengguna_melihat_daftar_produk(): void
    {
        $this->login();

        Product::create([
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 80gsm',
            'category_id' => $this->category()->id,
            'unit' => 'rim',
            'stock' => 15,
            'min_stock' => 10,
            'price' => 55000,
        ]);

        $this->get(route('products.index'))
            ->assertOk()
            ->assertSee('Kertas HVS A4 80gsm')
            ->assertSee('ATK-001');
    }

    public function test_menyimpan_produk_baru_dengan_stok_nol(): void
    {
        $this->login();
        $category = $this->category();

        $response = $this->post(route('products.store'), [
            'sku' => 'ATK-002',
            'name' => 'Pulpen Gel Hitam',
            'category_id' => $category->id,
            'unit' => 'pcs',
            'min_stock' => 20,
            'price' => 12000,
        ]);

        $response->assertRedirect(route('products.show', Product::where('sku', 'ATK-002')->firstOrFail()));

        // Stok awal selalu 0: hanya transaksi yang boleh mengubahnya.
        $this->assertDatabaseHas('products', [
            'sku' => 'ATK-002',
            'name' => 'Pulpen Gel Hitam',
            'stock' => 0,
        ]);
    }

    public function test_sku_duplikat_ditolak_validasi(): void
    {
        $this->login();
        $category = $this->category();

        Product::create([
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 80gsm',
            'category_id' => $category->id,
            'unit' => 'rim',
            'stock' => 0,
            'min_stock' => 10,
            'price' => 55000,
        ]);

        $this->from(route('products.create'))
            ->post(route('products.store'), [
                'sku' => 'ATK-001',
                'name' => 'Map Plastik Kancing',
                'category_id' => $category->id,
                'unit' => 'pcs',
                'min_stock' => 5,
                'price' => 9000,
            ])
            ->assertSessionHasErrors('sku');

        $this->assertDatabaseCount('products', 1);
    }

    public function test_memperbarui_produk_tanpa_menyentuh_kolom_stok(): void
    {
        $this->login();
        $product = Product::create([
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 80gsm',
            'category_id' => $this->category()->id,
            'unit' => 'rim',
            'stock' => 15,
            'min_stock' => 10,
            'price' => 55000,
        ]);

        $this->put(route('products.update', $product), [
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 75gsm',
            'category_id' => $product->category_id,
            'unit' => 'rim',
            'min_stock' => 12,
            'price' => 52000,
        ])->assertRedirect(route('products.show', $product));

        $this->assertDatabaseHas('products', [
            'id' => $product->id,
            'name' => 'Kertas HVS A4 75gsm',
            'min_stock' => 12,
            'stock' => 15, // stok tidak ikut berubah saat mengubah data produk
        ]);
    }

    public function test_daftar_produk_terpaginasi_sepuluh_per_halaman(): void
    {
        $this->login();
        $category = $this->category();

        for ($i = 1; $i <= 12; $i++) {
            Product::create([
                'sku' => sprintf('ATK-%03d', $i),
                'name' => "Produk Contoh {$i}",
                'category_id' => $category->id,
                'unit' => 'pcs',
                'stock' => $i,
                'min_stock' => 1,
                'price' => 1000,
            ]);
        }

        $response = $this->get(route('products.index'));

        // Halaman pertama memuat 10 dari 12 produk + tautan halaman kedua.
        $response->assertOk();
        $this->assertCount(10, $response->viewData('products')->items());
        $response->assertSee(route('products.index', ['page' => 2]));
        $response->assertSeeText('Produk Contoh 7');
        $response->assertDontSeeText('Produk Contoh 9');

        // Halaman kedua memuat sisa 2 produk.
        $second = $this->get(route('products.index', ['page' => 2]));
        $this->assertCount(2, $second->viewData('products')->items());
        $second->assertSeeText('Produk Contoh 8');
        $second->assertSeeText('Produk Contoh 9');
    }

    public function test_menghapus_produk_beserta_riwayat_pergerakannya(): void
    {
        $this->login();
        $product = Product::create([
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 80gsm',
            'category_id' => $this->category()->id,
            'unit' => 'rim',
            'stock' => 0,
            'min_stock' => 10,
            'price' => 55000,
        ]);

        $this->delete(route('products.destroy', $product))
            ->assertRedirect(route('products.index'));

        $this->assertDatabaseMissing('products', ['id' => $product->id]);
    }
}

<?php

namespace Tests\Feature;

use App\Models\Category;
use App\Models\Product;
use App\Models\User;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class SearchFilterTest extends TestCase
{
    use RefreshDatabase;

    private Category $elektronik;

    private Category $alatTulis;

    protected function setUp(): void
    {
        parent::setUp();

        $this->actingAs(User::factory()->create([
            'name' => 'Budi Santoso',
            'email' => '[email protected]',
        ]));

        $this->elektronik = Category::create(['name' => 'Elektronik']);
        $this->alatTulis = Category::create(['name' => 'Alat Tulis']);

        Product::create([
            'sku' => 'ELK-001',
            'name' => 'Mouse Wireless M1',
            'category_id' => $this->elektronik->id,
            'unit' => 'pcs',
            'stock' => 15,
            'min_stock' => 5,
            'price' => 85000,
        ]);

        Product::create([
            'sku' => 'ATK-001',
            'name' => 'Kertas HVS A4 80gsm',
            'category_id' => $this->alatTulis->id,
            'unit' => 'rim',
            'stock' => 3,
            'min_stock' => 10,
            'price' => 55000,
        ]);

        Product::create([
            'sku' => 'ELK-002',
            'name' => 'Tinta Printer Hitam',
            'category_id' => $this->elektronik->id,
            'unit' => 'botol',
            'stock' => 40,
            'min_stock' => 8,
            'price' => 120000,
        ]);
    }

    public function test_cari_berdasarkan_nama(): void
    {
        $this->get(route('products.index', ['q' => 'mouse']))
            ->assertOk()
            ->assertSee('Mouse Wireless M1')
            ->assertDontSee('Kertas HVS A4 80gsm')
            ->assertDontSee('Tinta Printer Hitam');
    }

    public function test_cari_berdasarkan_sku(): void
    {
        $this->get(route('products.index', ['q' => 'ATK']))
            ->assertOk()
            ->assertSee('Kertas HVS A4 80gsm')
            ->assertDontSee('Mouse Wireless M1');
    }

    public function test_cari_tidak_peka_huruf_besar_kecil(): void
    {
        $this->get(route('products.index', ['q' => 'TINTA']))
            ->assertOk()
            ->assertSee('Tinta Printer Hitam');
    }

    public function test_filter_berdasarkan_kategori(): void
    {
        $this->get(route('products.index', ['category' => $this->elektronik->id]))
            ->assertOk()
            ->assertSee('Mouse Wireless M1')
            ->assertSee('Tinta Printer Hitam')
            ->assertDontSee('Kertas HVS A4 80gsm');
    }

    public function test_filter_rentang_stok(): void
    {
        $this->get(route('products.index', ['stock_min' => 10, 'stock_max' => 30]))
            ->assertOk()
            ->assertSee('Mouse Wireless M1')   // stok 15 masuk rentang
            ->assertDontSee('Kertas HVS A4 80gsm') // stok 3 di bawah rentang
            ->assertDontSee('Tinta Printer Hitam'); // stok 40 di atas rentang
    }

    public function test_filter_stok_kritis_hanya_yang_di_bawah_minimum(): void
    {
        $this->get(route('products.index', ['critical' => 1]))
            ->assertOk()
            ->assertSee('Kertas HVS A4 80gsm')  // stok 3 <= min 10: kritis
            ->assertDontSee('Mouse Wireless M1') // stok 15 > min 5: aman
            ->assertDontSee('Tinta Printer Hitam');
    }

    public function test_filter_gabungan_pencarian_dan_kategori(): void
    {
        $this->get(route('products.index', ['q' => 'tinta', 'category' => $this->alatTulis->id]))
            ->assertOk()
            ->assertDontSee('Tinta Printer Hitam'); // cocok kata kunci, tetapi salah kategori
    }

    public function test_laporan_stok_kritis_menampilkan_produk_yang_perlu_dipesan(): void
    {
        $this->get(route('reports.low-stock'))
            ->assertOk()
            ->assertSee('Kertas HVS A4 80gsm')
            ->assertSee('7 rim') // kekurangan: 10 - 3
            ->assertDontSee('Mouse Wireless M1')
            ->assertDontSee('Tinta Printer Hitam');
    }
}

<?php

namespace Tests\Feature;

use App\Exceptions\InsufficientStockException;
use App\Models\Category;
use App\Models\Product;
use App\Models\StockMovement;
use App\Models\User;
use App\Services\StockService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\DB;
use RuntimeException;
use Tests\TestCase;

class StockMovementTest extends TestCase
{
    use RefreshDatabase;

    private function user(): User
    {
        return User::factory()->create([
            'name' => 'Budi Santoso',
            'email' => '[email protected]',
        ]);
    }

    private function product(): Product
    {
        return Product::create([
            'sku' => 'ELK-001',
            'name' => 'Mouse Wireless M1',
            'category_id' => Category::create(['name' => 'Elektronik'])->id,
            'unit' => 'pcs',
            'stock' => 0,
            'min_stock' => 5,
            'price' => 85000,
        ]);
    }

    public function test_barang_masuk_menambah_stok(): void
    {
        $user = $this->user();
        $product = $this->product();

        $movement = app(StockService::class)->recordMovement(
            $product,
            StockMovement::TYPE_IN,
            20,
            'Stok pembukaan',
            $user,
            '2026-01-02',
        );

        $this->assertSame(20, $product->fresh()->stock);
        $this->assertSame(20, $movement->quantity);
        $this->assertDatabaseHas('stock_movements', [
            'product_id' => $product->id,
            'type' => 'in',
            'quantity' => 20,
            'user_id' => $user->id,
        ]);
    }

    public function test_barang_keluar_mengurangi_stok(): void
    {
        $product = $this->product();

        app(StockService::class)->recordMovement($product, StockMovement::TYPE_IN, 20, movementDate: '2026-01-02');
        app(StockService::class)->recordMovement($product, StockMovement::TYPE_OUT, 7, 'Peminjaman ruang meeting', movementDate: '2026-01-05');

        $this->assertSame(13, $product->fresh()->stock);
        $this->assertDatabaseCount('stock_movements', 2);
    }

    public function test_stok_tidak_bisa_negatif(): void
    {
        $product = $this->product();

        app(StockService::class)->recordMovement($product, StockMovement::TYPE_IN, 5, movementDate: '2026-01-02');

        try {
            app(StockService::class)->recordMovement($product, StockMovement::TYPE_OUT, 8, movementDate: '2026-01-05');
            $this->fail('Barang keluar melebihi stok seharusnya melempar pengecualian.');
        } catch (InsufficientStockException $exception) {
            $this->assertSame(5, $exception->product->stock);
            $this->assertSame(8, $exception->requested);
        }

        // Stok tetap dan tidak ada baris riwayat baru yang tersimpan.
        $this->assertSame(5, $product->fresh()->stock);
        $this->assertDatabaseCount('stock_movements', 1);
    }

    public function test_kegagalan_di_tengah_transaksi_dibatalkan_seluruhnya(): void
    {
        $product = $this->product();

        // Simulasikan gangguan setelah pengecekan stok,
        // tepat saat baris stock_movements hendak dibuat.
        StockMovement::creating(function (): void {
            throw new RuntimeException('simulasi gangguan saat menyimpan riwayat');
        });

        try {
            app(StockService::class)->recordMovement(
                $product,
                StockMovement::TYPE_IN,
                10,
                movementDate: '2026-01-02',
            );
            $this->fail('Pengecualian simulasi seharusnya terlempar.');
        } catch (RuntimeException) {
            // dibiarkan: inilah skenario yang diuji
        } finally {
            StockMovement::flushEventListeners();
        }

        // Atomicity: tidak ada perubahan yang lolos setelah rollback.
        $this->assertSame(0, $product->fresh()->stock);
        $this->assertDatabaseCount('stock_movements', 0);
    }

    public function test_form_barang_keluar_melebihi_stok_ditolak(): void
    {
        $user = $this->user();
        $product = $this->product();

        $product->forceFill(['stock' => 5])->save();

        $this->actingAs($user)
            ->from(route('movements.create'))
            ->post(route('movements.store'), [
                'product_id' => $product->id,
                'type' => 'out',
                'quantity' => 9,
                'note' => 'Peminjaman untuk pameran',
                'movement_date' => '2026-01-05',
            ])
            ->assertSessionHasErrors('quantity');

        $this->assertSame(5, $product->fresh()->stock);
        $this->assertDatabaseCount('stock_movements', 0);
    }

    public function test_form_transaksi_valid_menyimpan_dan_mengalihkan(): void
    {
        $user = $this->user();
        $product = $this->product();

        $this->actingAs($user)
            ->post(route('movements.store'), [
                'product_id' => $product->id,
                'type' => 'in',
                'quantity' => 12,
                'note' => 'Pembelian batch pertama',
                'movement_date' => '2026-01-03',
            ])
            ->assertRedirect(route('products.show', $product));

        $this->assertSame(12, $product->fresh()->stock);
        $this->assertDatabaseHas('stock_movements', [
            'product_id' => $product->id,
            'type' => 'in',
            'quantity' => 12,
            'user_id' => $user->id,
        ]);
    }

    public function test_riwayat_transaksi_menampilkan_gerakan_terbaru(): void
    {
        $user = $this->user();
        $product = $this->product();

        app(StockService::class)->recordMovement($product, StockMovement::TYPE_IN, 10, 'Stok pembukaan', $user, '2026-01-02');
        app(StockService::class)->recordMovement($product, StockMovement::TYPE_OUT, 4, 'Peminjaman ruang meeting', $user, '2026-01-05');

        $this->actingAs($user)
            ->get(route('movements.index'))
            ->assertOk()
            ->assertSee('Mouse Wireless M1')
            ->assertSee('Stok pembukaan')
            ->assertSee('Peminjaman ruang meeting');
    }
}