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Getting Started with PHP Unit Testing

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Keeping Bugs at Bay

2:22 with Alena Holligan

Testing helps keep us from introducing a bug into our code, and it also helped us diagnose what the problem was.

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    We'll go into our test and we'll copy our digraph test. 0:01
    We'll change this to trigraph. 0:10
    And we'll need a trigraphed word. 0:13
    I'll use streak. 0:18
    The expected output will be eakstray. 0:22
    And let's run our test again. 0:27
    As expected, our third test fails. 0:31
    And we can see that it only moved 0:34
    the first two letters instead of the first three. 0:37
    Back in our converter, we'll start by adding our trigraph array. 0:42
    Then we can add a new variable for firstThreeLetters. 0:48
    Substring, the word, 0:54
    start at the beginning, and give the first three letters. 1:00
    Next, we can copy our if statement to create an else if. 1:04
    We'll change to first, Three letters, and first three letters. 1:11
    Start at the third character, and use our trigraph. 1:22
    And now let's run our test again. 1:27
    We get our same failure, but why? 1:30
    Again, in our expected results, compared to our actual results, 1:34
    we see that only the first two letters of streak has been moved. 1:39
    That's because we're checking for digraphs first. 1:44
    An ST is a digraph. 1:48
    And STR is a trigraph. 1:50
    Our test helps keep us from introducing a bug into our code. 1:53
    And it also help this diagnose what the problem was. 1:58
    We need to move our trigraph check before our di-graph check. 2:02
    Now let's run our test again. 2:16
    And this time they all pass. 2:20

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