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<h1>
    Interfaces
</h1>
<p>
Interfaces are objects that specify (document) the external behavior of objects
that “provide” them. An interface specifies behavior through method definitions
that specify functions and their signatures.
</p>
<p>Let's look at an example of an interface and a class implementing the interface:</p>
<script class="doctest">

class ITestable extends Interface {
    reset() {}
    run() {}
}

class Testable {

    reset() {
        print("Resetting testable object")
    }

    run() {
        print("Running testable object")
    }
}
</script>
<p>We can now check whether the promised interface methods are implemented by the
class:</p>
<script class="doctest">
Doctest.expect(ITestable.implementedBy(Testable), true)
</script>
<p>
<h2>
References
</h2>
<ul>
    <li><a href="https://zopeinterface.readthedocs.io">Zope Interfaces</a></li>
</ul>
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