Final answer:
The test to determine the validity of legislation enacted under the Necessary and Proper Clause is the constitutional test, which examines whether the legislation is necessary and proper for carrying out the powers delegated to Congress by the Constitution.
Step-by-step explanation:
The test to determine the validity of legislation enacted under the Necessary and Proper Clause is commonly referred to as the constitutional test. This test involves examining whether the legislation is necessary and proper for carrying out the powers delegated to Congress by the Constitution. The Supreme Court has used this test in cases such as McCulloch v. Maryland to evaluate the constitutionality of legislation enacted under the Necessary and Proper Clause.