Underspecification

Definition:

  • While it’s clearly possible for a test suite to do too much, it’s far more common for it to do too little.

Code Example:

MIN_FREE_SHIPPING_PRICE = 25.0

def free_shipping?(total_order_price)
total_order_price > MIN_FREE_SHIPPING_PRICE
end

def test_free_shipping_returns_true_for_order_above_min_price
assert free_shipping?(MIN_FREE_SHIPPING_PRICE + 1)
end

def test_free_shipping_returns_false_for_order_below_min_price
assert !free_shipping?(MIN_FREE_SHIPPING_PRICE - 1)
end

References:

Quality attributes

  • - Code Example

  • - Cause and Effect

  • - Frequency

  • - Refactoring