// AI wrote your tests. Would they catch a bug?
// Teaching excerpts; see the explanation and boundaries on the episode page.

// Start with the requirement
function shipsFree(total: number) {
  return total >= 50;
}

// Two tests pass, but a mutant survives
expect(shipsFree(49)).toBe(false);
expect(shipsFree(51)).toBe(true);

// Original: 50 >= 50 → true
// Mutant:   50 > 50  → false

// Test exactly 50
expect(shipsFree(50)).toBe(true);

// Run Stryker with Vitest
npm i -D @stryker-mutator/core @stryker-mutator/vitest-runner
npx stryker init
npx stryker run

// Scope the code to mutate
{
  "testRunner": "vitest",
  "mutate": ["src/shipping.ts"]
}