実践的なパターン: テストの容易性を高める設計

Although these types seem distinct in theory, the differences become more blurred in practice. For that reason, I think it makes sense to think of test doubles as inhabiting a continuum, as illustrated in Figure 2. At the one extreme you'll find dummies with absolutely no implementation, and at the other end are full production implementations. Dummies and production implementations are both well-