feat: add unit tests for ReceiptImportService.saveReceipt method

backend/src/receipt-import/receipt-import.save.spec.ts

@@ -0,0 +1,209 @@
+import { BadRequestException } from '@nestjs/common';
+import { Prisma } from '@prisma/client';
+import { ReceiptImportService } from './receipt-import.service';
+import { SaveReceiptDto } from './dto/save-receipt.dto';
+
+// ──────────────────────────────────────────────────────────────────────────────
+// Hjälpfunktioner
+// ──────────────────────────────────────────────────────────────────────────────
+
+function makeItem(overrides: Partial<SaveReceiptDto['items'][0]> = {}): SaveReceiptDto['items'][0] {
+  return {
+    rawName: 'ARLA MJOLK 1L',
+    quantity: 2,
+    unit: 'st',
+    destination: 'inventory',
+    productId: 100,
+    ...overrides,
+  } as SaveReceiptDto['items'][0];
+}
+
+// ──────────────────────────────────────────────────────────────────────────────
+// Spec
+// ──────────────────────────────────────────────────────────────────────────────
+
+describe('ReceiptImportService.saveReceipt', () => {
+  let txMock: {
+    product: { findUnique: jest.Mock; create: jest.Mock; update: jest.Mock };
+    inventoryItem: { create: jest.Mock; update: jest.Mock };
+    pantryItem: { create: jest.Mock };
+    receiptAlias: { upsert: jest.Mock };
+    unitMapping: { upsert: jest.Mock };
+  };
+
+  let prismaMock: {
+    pantryItem: { findMany: jest.Mock };
+    inventoryItem: { findMany: jest.Mock };
+    $transaction: jest.Mock;
+  };
+
+  let service: ReceiptImportService;
+
+  beforeEach(() => {
+    txMock = {
+      product: {
+        findUnique: jest.fn(),
+        create: jest.fn(),
+        update: jest.fn(),
+      },
+      inventoryItem: {
+        create: jest.fn().mockResolvedValue({ id: 1 }),
+        update: jest.fn().mockResolvedValue({ id: 1 }),
+      },
+      pantryItem: {
+        create: jest.fn().mockResolvedValue({ id: 1 }),
+      },
+      receiptAlias: {
+        upsert: jest.fn().mockResolvedValue({ id: 1 }),
+      },
+      unitMapping: {
+        upsert: jest.fn().mockResolvedValue({ id: 1 }),
+      },
+    };
+
+    prismaMock = {
+      pantryItem: { findMany: jest.fn().mockResolvedValue([]) },
+      inventoryItem: { findMany: jest.fn().mockResolvedValue([]) },
+      $transaction: jest.fn().mockImplementation(async (cb: (tx: typeof txMock) => Promise<void>) => cb(txMock)),
+    };
+
+    service = new ReceiptImportService(
+      prismaMock as any,
+      {} as any, // aiService – används ej i saveReceipt
+      {} as any, // categoriesService – används ej i saveReceipt
+    );
+  });
+
+  // ── 1. Skapar ny inventariepost ─────────────────────────────────────────────
+  it('skapar ny inventariepost när produkten finns och inte finns i inventariet', async () => {
+    txMock.product.findUnique.mockResolvedValue({ id: 100, isActive: true });
+
+    const dto: SaveReceiptDto = { items: [makeItem()] };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(txMock.inventoryItem.create).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({ productId: 100, userId: 1 }),
+      }),
+    );
+    expect(result.created).toBe(1);
+    expect(result.merged).toBe(0);
+    expect(result.errors).toHaveLength(0);
+  });
+
+  // ── 2. Slår samman mängd när produkten redan finns i inventariet ────────────
+  it('slår samman mängd när produkten redan finns i inventariet', async () => {
+    prismaMock.inventoryItem.findMany.mockResolvedValue([
+      { id: 50, productId: 100, quantity: new Prisma.Decimal(3), unit: 'st' },
+    ]);
+    txMock.product.findUnique.mockResolvedValue({ id: 100, isActive: true });
+
+    const dto: SaveReceiptDto = { items: [makeItem({ quantity: 2 })] };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(txMock.inventoryItem.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: { id: 50 },
+        data: { quantity: { increment: new Prisma.Decimal(2) } },
+      }),
+    );
+    expect(result.merged).toBe(1);
+    expect(result.created).toBe(0);
+  });
+
+  // ── 3. Lägger till i skafferi ───────────────────────────────────────────────
+  it('lägger till i skafferi när destination är pantry och produkten inte finns där', async () => {
+    txMock.product.findUnique.mockResolvedValue({ id: 100, isActive: true });
+
+    const dto: SaveReceiptDto = { items: [makeItem({ destination: 'pantry' })] };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(txMock.pantryItem.create).toHaveBeenCalledWith(
+      expect.objectContaining({ data: { userId: 1, productId: 100 } }),
+    );
+    expect(result.pantryAdded).toBe(1);
+    expect(result.pantrySkipped).toBe(0);
+  });
+
+  // ── 4. Hoppar över skafferidublett ──────────────────────────────────────────
+  it('hoppar över produkt som redan finns i skafferiet', async () => {
+    prismaMock.pantryItem.findMany.mockResolvedValue([{ productId: 100 }]);
+    txMock.product.findUnique.mockResolvedValue({ id: 100, isActive: true });
+
+    const dto: SaveReceiptDto = { items: [makeItem({ destination: 'pantry' })] };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(txMock.pantryItem.create).not.toHaveBeenCalled();
+    expect(result.pantrySkipped).toBe(1);
+    expect(result.pantryAdded).toBe(0);
+  });
+
+  // ── 5. Lär in alias ─────────────────────────────────────────────────────────
+  it('lär in alias när learnAlias är true', async () => {
+    txMock.product.findUnique.mockResolvedValue({ id: 100, isActive: true });
+
+    const dto: SaveReceiptDto = {
+      items: [makeItem({ learnAlias: true, learnAliasGlobally: false })],
+    };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(txMock.receiptAlias.upsert).toHaveBeenCalledWith(
+      expect.objectContaining({
+        create: expect.objectContaining({
+          receiptName: 'arla mjolk 1l',
+          productId: 100,
+          isGlobal: false,
+          ownerId: 1,
+        }),
+      }),
+    );
+    expect(result.aliasesLearned).toBe(1);
+  });
+
+  // ── 6. Skapar ny privat produkt via createProductName ───────────────────────
+  it('skapar ny produkt när createProductName anges och produkten inte finns', async () => {
+    txMock.product.findUnique.mockResolvedValue(null); // ingen befintlig
+
+    txMock.product.create.mockResolvedValue({ id: 200 });
+
+    const dto: SaveReceiptDto = {
+      items: [
+        makeItem({ productId: undefined, createProductName: 'Hemmagjord Senap' }),
+      ],
+    };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(txMock.product.create).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({
+          name: 'Hemmagjord Senap',
+          isPrivate: true,
+          ownerId: 1,
+        }),
+      }),
+    );
+    expect(result.created).toBe(1);
+    expect(result.errors).toHaveLength(0);
+  });
+
+  // ── 7. Produkt hittades inte – registrerar fel utan att kasta ───────────────
+  it('registrerar fel för okänt productId utan att kasta exception', async () => {
+    txMock.product.findUnique.mockResolvedValue(null);
+
+    const dto: SaveReceiptDto = { items: [makeItem({ productId: 999 })] };
+    const result = await service.saveReceipt(1, dto);
+
+    expect(result.errors).toHaveLength(1);
+    expect(result.errors![0].index).toBe(0);
+    expect(result.created).toBe(0);
+  });
+
+  // ── 8. Kastar BadRequestException om transaktionen misslyckas ───────────────
+  it('kastar BadRequestException om $transaction kastar', async () => {
+    prismaMock.$transaction.mockRejectedValue(new Error('DB krasch'));
+
+    const dto: SaveReceiptDto = { items: [makeItem()] };
+
+    await expect(service.saveReceipt(1, dto)).rejects.toThrow(BadRequestException);
+  });
+});