我正在上一门使用Python进行单元测试的课程，作为练习，他们希望我们使用一个函数，该函数读取页面并将其转换为html，然后将其拆分为两个单独的函数。这是html_pages.py的代码：
import html as html_converter
class FileAccessWrapper:
def __init__(self, filename):
self.filename = filename
def open(self):
return open(self.filename, "r", encoding="UTF-8")
class HtmlPagesConverter:
def __init__(self, file_access):
"""Read the file and note the positions of the page breaks so we can access them quickly"""
self.file_access = file_access
self.breaks = [0]
with self.file_access.open() as f:
while True:
line = f.readline()
if not line:
break
line = line.rstrip()
if "PAGE_BREAK" in line:
page_break_position = f.tell()
self.breaks.append(f.tell())
self.breaks.append(f.tell())
def get_html_page(self, page):
"""Return html page with the given number (zero indexed)"""
page_start = self.breaks[page]
page_end = self.breaks[page+1]
html = ""
with self.file_access.open() as f:
f.seek(page_start)
while f.tell() != page_end:
line = f.readline()
line = line.rstrip()
if "PAGE_BREAK" in line:
continue
html += html_converter.escape(line, quote=True)
html += "<br />"
return html
以下是他们在test_html_pages.py中定义的测试用例：
import unittest
import os
import tempfile
import io
from html_pages import HtmlPagesConverter, FileAccessWrapper
class HtmlPagesTest(unittest.TestCase):
def test_inserts_br_tags_for_linebreaks(self):
filename = os.path.join(tempfile.gettempdir(), "afile.txt")
f = open(filename, "w", encoding="UTF-8")
f.write("plain text\n")
f.close()
converter = HtmlPagesConverter(FileAccessWrapper(filename))
new_text = converter.get_html_page(0)
self.assertEqual("plain text<br />", new_text)
def test_quotes_escaped(self):
converter = HtmlPagesConverter(FakeFileWrapper("text with 'quotes'"))
new_text = converter.get_html_page(0)
self.assertEqual("text with 'quotes'<br />", new_text)
def test_random_access_pages(self):
converter = HtmlPagesConverter(FakeFileWrapper("page one\nPAGE_BREAK\npage two\nPAGE_BREAK\npage three"))
page_two = converter.get_html_page(1)
self.assertEqual("page two<br />", page_two)
class FakeFileWrapper:
def __init__(self, text):
self.text = text
def open(self):
return io.StringIO(self.text)
我想分裂的想法是这样的
import html as html_converter
class FileAccessWrapper:
def __init__(self, filename):
self.filename = filename
def open(self):
return open(self.filename, "r", encoding="UTF-8")
class HtmlPagesConverter:
def __init__(self, file_access):
"""Read the file and note the positions of the page breaks so we can access them quickly"""
self.file_access = file_access
self.breaks = [0]
with self.file_access.open() as f:
while True:
line = f.readline()
if not line:
break
line = line.rstrip()
if "PAGE_BREAK" in line:
page_break_position = f.tell()
self.breaks.append(f.tell())
self.breaks.append(f.tell())
def get_html_page(self, page):
"""Return html page with the given number (zero indexed)"""
page_start = self.breaks[page]
page_end = self.breaks[page+1]
html = ""
with self.file_access.open() as f:
f.seek(page_start)
while f.tell() != page_end:
line = f.readline()
html = line
return html
def convert_html_page(self, page):
"""Convert html page with the given number"""
page_start = self.breaks[page]
page_end = self.breaks[page + 1]
html = ""
with self.file_access.open() as f:
line = f.readline()
line = line.rstrip()
html += html_converter.escape(line, quote=True)
html += "<br />"
return html
然后将测试更改为在测试中以这种方式调用convert_html_page
import unittest
import os
import tempfile
import io
from html_pages import HtmlPagesConverter, FileAccessWrapper
class HtmlPagesTest(unittest.TestCase):
def test_inserts_br_tags_for_linebreaks(self):
filename = os.path.join(tempfile.gettempdir(), "afile.txt")
f = open(filename, "w", encoding="UTF-8")
f.write("plain text\n")
f.close()
converter = HtmlPagesConverter(FileAccessWrapper(filename))
new_text = converter.convert_html_page(0)
self.assertEqual("plain text<br />", new_text)
def test_quotes_escaped(self):
converter = HtmlPagesConverter(FakeFileWrapper("text with 'quotes'"))
new_text = converter.convert_html_page(0)
self.assertEqual("text with 'quotes'<br />", new_text)
def test_random_access_pages(self):
converter = HtmlPagesConverter(FakeFileWrapper("page one\nPAGE_BREAK\npage two\nPAGE_BREAK\npage three"))
page_two = converter.convert_html_page(1)
self.assertEqual("page two<br />", page_two)
class FakeFileWrapper:
def __init__(self, text):
self.text = text
def open(self):
return io.StringIO(self.text)
但这会使测试失败并出现这些错误
Testing started at 21.05 ...
/home/af/Dokumenter/Programs/Python/venv/bin/python /usr/share/pycharm/helpers/pycharm/_jb_unittest_runner.py --path "/home/af/Dokumenter/Programs/Python/Example Files/Intermediate/fake/fake_example_after/test_html_pages.py"
Ran 3 tests in 0.002s
FAILED (failures=1)
Launching unittests with arguments python -m unittest /home/af/Dokumenter/Programs/Python/Example Files/Intermediate/fake/fake_example_after/test_html_pages.py in /home/af/Dokumenter/Programs/Python/Example Files/Intermediate/fake/fake_example_after
page one<br /> != page two<br />
Expected :page two<br />
Actual :page one<br />
<Click to see difference>
Traceback (most recent call last):
File "/usr/share/pycharm/helpers/pycharm/teamcity/diff_tools.py", line 32, in _patched_equals
old(self, first, second, msg)
File "/usr/lib/python3.7/unittest/case.py", line 839, in assertEqual
assertion_func(first, second, msg=msg)
File "/usr/lib/python3.7/unittest/case.py", line 1220, in assertMultiLineEqual
self.fail(self._formatMessage(msg, standardMsg))
File "/usr/lib/python3.7/unittest/case.py", line 680, in fail
raise self.failureException(msg)
AssertionError: 'page two<br />' != 'page one<br />'
- page two<br />
? --
+ page one<br />
? ++
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3.7/unittest/case.py", line 59, in testPartExecutor
yield
File "/usr/lib/python3.7/unittest/case.py", line 615, in run
testMethod()
File "/home/af/Dokumenter/Programs/Python/Example Files/Intermediate/fake/fake_example_after/test_html_pages.py", line 27, in test_random_access_pages
self.assertEqual("page two<br />", page_two)
Process finished with exit code 1