Introduce Assertion

A section of code assumes something about the state of the program.

Make the assumption explicit with an assertion.

	double getExpenseLimit() {
		// should have either expense limit or a primary project
		return (_expenseLimit != NULL_EXPENSE) ?
			_expenseLimit:
			_primaryProject.getMemberExpenseLimit();
	}

	double getExpenseLimit() {
		Assert.isTrue (_expenseLimit != NULL_EXPENSE || _primaryProject != null);
		return (_expenseLimit != NULL_EXPENSE) ?
			_expenseLimit:
			_primaryProject.getMemberExpenseLimit();
	}

For more inforamtion see page 267 of Refactoring

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