Modern C++ Programming with Test-Driven Development

2.10 One Thing at a Time

We want to test-drive converting ​multiple​ characters in the tail of the word.

TEST_F(SoundexEncoding, ReplacesMultipleConsonantsWithDigits) {
   ASSERT_THAT(soundex.encode("Acdl"), Eq("A234"));
}

A simple solution would involve iterating through all but the first letter of the word, converting each. But our code isn’t quite structured in a way that easily supports that. Let’s restructure the code.

One thing at a time, however. When test-driving, you want to keep each step in the cycle distinct. When writing a test, don’t go off and refactor. Don’t refactor when trying to get a test to pass, either. Combining the two activities will waste your time when things go awry, which they will.

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