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Specific tests for (some of) the methods in L{twisted.web.domhelpers}.
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A mixin for L{TestCase} subclasses which defines test methods for
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L{getNodeText} returns the concatenation of all the text data at or
beneath the node passed to it.
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Microdom does not decode entities in text nodes.
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L{domhelpers.getNodeText} returns a C{unicode} string when text
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