How to: :thumbsdown: Anti-Pattern Example: A test suite that passes due to non-realistic data
![](https://img.shields.io/badge/🔧%20Example%20using%20Jest-blue.svg "Examples with Jest")

```javascript
const addProduct = (name, price) => {
  const productNameRegexNoSpace = /^\S*$/; //no white-space allowed

  if (!productNameRegexNoSpace.test(name)) return false; //this path never reached due to dull input

  //some logic here
  return true;
};

test("Wrong: When adding new product with valid properties, get successful confirmation", async () => {
  //The string "Foo" which is used in all tests never triggers a false result
  const addProductResult = addProduct("Foo", 5);
  expect(addProductResult).toBe(true);
  //Positive-false: the operation succeeded because we never tried with long
  //product name including spaces
});
```