Unit Test Üretimi: Jest, Pytest, JUnit Örnekleri

import { describe, it, expect, vi } from "vitest";
import { calculateDiscount } from "./pricing";
 
describe("calculateDiscount", () => {
  // Senaryo: Standart indirim hesabı
  it("returns 10% discount for amounts over 1000", () => {
    expect(calculateDiscount(1500)).toBe(150);
  });
 
  // Senaryo: Sınır durumu — eşik değeri
  it("applies discount exactly at threshold", () => {
    expect(calculateDiscount(1000)).toBe(100);
  });
 
  // Senaryo: Eşik altı — indirim yok
  it("returns 0 discount below threshold", () => {
    expect(calculateDiscount(999)).toBe(0);
  });
 
  // Senaryo: Sıfır miktar
  it("returns 0 for zero amount", () => {
    expect(calculateDiscount(0)).toBe(0);
  });
 
  // Senaryo: Negatif miktar — hata
  it("throws ValidationError for negative amount", () => {
    expect(() => calculateDiscount(-100)).toThrow("Amount must be non-negative");
  });
 
  // Senaryo: Çok büyük miktar — overflow yok
  it("handles large amounts correctly", () => {
    expect(calculateDiscount(Number.MAX_SAFE_INTEGER)).toBeGreaterThan(0);
  });
});