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For code coverage to work,
you'll need to have Xdebug installed.

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Xdebug is a PHP extension, so
you do not install it through Composer.

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For details on installation, check
the notes associated with this video.

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Once Xdebug is installed, we can add
code coverage to our phpunit.xml file.

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We'll need to add whitelisting to
tell PHPUnit which files to check.

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Let's copy these lines.

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In our phpunit.xml file,
we'll add the filter

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We're only going to need the directory.

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We want to use our class's directory.

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And we want to test all
files ending in .php.

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Next we want to set up logging.

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Let's copy these lines.

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And after our filter,

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We're going to use our coverage-html.

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And we're going to use our coverage-text
so that we can output to the terminal.

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We'll also keep our lines for
the testdox-html and testdox-text.

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Let's change our path.

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We'll set this to tests/logs,
As well as here,

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test/logs, tests/logs.

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Now let's try running our test again.

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When we run our test,
we see a simple Code Coverage Report.

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That combines all the files
from our classes directory.

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We then see additional details for
the classes that actually have some tests.

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We also have a new directory
named logs within our tests.

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We have the testdox that
we looked at before.

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But now we also have a reports folder.

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This folder contains some HTML files
that we can view in the browser.

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We see this nicely formatted report.

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And we can scroll into our tests.

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We can see the construct and
the getTitle methods are actually tested.

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100% code coverage still may
not cover all scenarios.

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Just because all lines
are covered by a test,

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does not mean that they're
tested against all input.

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But the more tests you have,

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the more confident you can be
that your code is working.