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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.python.htmlizer}.
"""
from io import BytesIO
from twisted.python.htmlizer import filter
from twisted.trial.unittest import TestCase
class FilterTests(TestCase):
"""
Tests for L{twisted.python.htmlizer.filter}.
"""
def test_empty(self):
"""
If passed an empty input file, L{filter} writes a I{pre} tag containing
only an end marker to the output file.
"""
input = BytesIO(b"")
output = BytesIO()
filter(input, output)
self.assertEqual(
output.getvalue(), b'<pre><span class="py-src-endmarker"></span></pre>\n'
)
def test_variable(self):
"""
If passed an input file containing a variable access, L{filter} writes
a I{pre} tag containing a I{py-src-variable} span containing the
variable.
"""
input = BytesIO(b"foo\n")
output = BytesIO()
filter(input, output)
self.assertEqual(
output.getvalue(),
b'<pre><span class="py-src-variable">foo</span>'
b'<span class="py-src-newline">\n'
b'</span><span class="py-src-endmarker"></span></pre>\n',
)