feat: add tests for normalizeName and RecipesService methods, including unit conversion and alias normalization

backend/src/common/utils/normalize-name.spec.ts

@@ -0,0 +1,42 @@
+import { normalizeName } from './normalize-name';
+
+describe('normalizeName', () => {
+  it('gör om till gemener', () => {
+    expect(normalizeName('Kycklingfilé')).toBe('kycklingfile');
+  });
+
+  it('tar bort svenska diakritiska tecken', () => {
+    expect(normalizeName('åäö')).toBe('aao');
+    expect(normalizeName('ÅÄÖ')).toBe('aao');
+  });
+
+  it('tar bort mellanslag', () => {
+    expect(normalizeName('rökt paprikapulver')).toBe('roktpaprikapulver');
+  });
+
+  it('tar bort inledande och avslutande mellanslag', () => {
+    expect(normalizeName('  lax  ')).toBe('lax');
+  });
+
+  it('tar bort specialtecken', () => {
+    expect(normalizeName('Curry (mild)')).toBe('currymild');
+  });
+
+  it('hanterar siffror', () => {
+    expect(normalizeName('Omega-3')).toBe('omega3');
+  });
+
+  it('hanterar tom sträng', () => {
+    expect(normalizeName('')).toBe('');
+  });
+
+  it('hanterar sträng med bara mellanslag', () => {
+    expect(normalizeName('   ')).toBe('');
+  });
+
+  it('normaliserar accenter korrekt', () => {
+    expect(normalizeName('Fläskfilé')).toBe('flaskfile');
+    expect(normalizeName('Gräddfil')).toBe('graddfil');
+    expect(normalizeName('Rödlök')).toBe('rodlok');
+  });
+});