系统学习Python——单元测试unittest：测试报告

分类目录：《系统学习Python》总目录
相关文章：
· 单元测试unittest：框架结构
· 单元测试unittest：测试固件
· 单元测试unittest：编写测试用例
· 单元测试unittest：执行测试用例
· 单元测试unittest：用例执行次序
· 单元测试unittest：内置装饰器
· 单元测试unittest：命令行执行测试
· 单元测试unittest：批量执行测试文件
· 单元测试unittest：测试断言
· 单元测试unittest：测试报告

前面的文章，我们所有的测试结果都是直接输出到PyCharm控制台的。这不利于我们查看和保存测试结果。本文我们将说明如何借助HTMLTestRunner生成HTML测试报告。

准备工作如下。

下载HTMLTestRunner.py文件，官网为Python 2的，如需Python 3的可以移步至本文末尾。
将HTMLTestRunner.py文件复制到Python安装目录下的Lib文件夹中。
在Python交互模式下导入模块，测试是否成功。

没有报错，说明导入成功。接下来，我们在文件夹下面新建一个Python Package，并取名为“Storm_10_2”。然后在下面新建3个文件，文件名及内容如下：
文件test1.py:

import unittestclass MyTestCase(unittest.TestCase):def test_a(self):print('test_a')self.assertEqual('a', 'a')def test_b(self):print('test_b')self.assertEqual('b', 'b')if __name__ == '__main__':unittest.main()

文件test2.py:

import unittestclass MyTestCase(unittest.TestCase):def test_c(self):print('test_c')self.assertEqual('c', 'c')def test_d(self):print('test_d')self.assertEqual('d', 'd')if __name__ == '__main__':unittest.main()

文件run.py：

import unittest
import HTMLTestRunnerif __name__ == '__main__':testsuite = unittest.TestLoader().discover('.')unittest.TextTestRunner(verbosity=2).run(testsuite)file_name = r'D:\HTMLTestRunner_output.html'with open(file_name, 'wb') as f:runner = HTMLTestRunner.HTMLTestRunner(stream=f, title='报告标题', description='报告描述')runner.run(testsuite)

我们重点看一下run.py文件，有以下几点需要注意：

通过unittest.TestLoader().discover('.')构造测试集合。
通过with open的方式打开、写入文件，不需要手动关闭文件。
通过调用HTMLTestRunner.HTMLTestRunner来生成测试报告。

当我们执行run.py文件后，程序会在指定的目录（上方代码指定的目录为D盘根目录）下生成一个测试报告文件，我们通过浏览器打开：

前文提到官网HTMLTestRunner.py文件为Python 2的，Python 3版本的可以直接复制如下代码：

"""
A TestRunner for use with the Python unit testing framework. It
generates a HTML report to show the result at a glance.The simplest way to use this is to invoke its main method. E.g.import unittestimport HTMLTestRunner... define your tests ...if __name__ == '__main__':HTMLTestRunner.main()For more customization options, instantiates a HTMLTestRunner object.
HTMLTestRunner is a counterpart to unittest's TextTestRunner. E.g.# output to a filefp = file('my_report.html', 'wb')runner = HTMLTestRunner.HTMLTestRunner(stream=fp,title='My unit test',description='This demonstrates the report output by HTMLTestRunner.')# Use an external stylesheet.# See the Template_mixin class for more customizable optionsrunner.STYLESHEET_TMPL = '<link rel="stylesheet" href="my_stylesheet.css" type="text/css">'# run the testrunner.run(my_test_suite)------------------------------------------------------------------------
Copyright (c) 2004-2007, Wai Yip Tung
All rights reserved.Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:* Redistributions of source code must retain the above copyright notice,this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyrightnotice, this list of conditions and the following disclaimer in thedocumentation and/or other materials provided with the distribution.
* Neither the name Wai Yip Tung nor the names of its contributors may beused to endorse or promote products derived from this software withoutspecific prior written permission.THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""# URL: http://tungwaiyip.info/software/HTMLTestRunner.html__author__ = "Wai Yip Tung"
__version__ = "0.8.2""""
Change HistoryVersion 0.8.2
* Show output inline instead of popup window (Viorel Lupu).Version in 0.8.1
* Validated XHTML (Wolfgang Borgert).
* Added description of test classes and test cases.Version in 0.8.0
* Define Template_mixin class for customization.
* Workaround a IE 6 bug that it does not treat <script> block as CDATA.Version in 0.7.1
* Back port to Python 2.3 (Frank Horowitz).
* Fix missing scroll bars in detail log (Podi).
"""# TODO: color stderr
# TODO: simplify javascript using ,ore than 1 class in the class attribute?import datetime
import io
import sys
import time
import unittest
from xml.sax import saxutils# ------------------------------------------------------------------------
# The redirectors below are used to capture output during testing. Output
# sent to sys.stdout and sys.stderr are automatically captured. However
# in some cases sys.stdout is already cached before HTMLTestRunner is
# invoked (e.g. calling logging.basicConfig). In order to capture those
# output, use the redirectors for the cached stream.
#
# e.g.
#   >>> logging.basicConfig(stream=HTMLTestRunner.stdout_redirector)
#   >>>class OutputRedirector(object):""" Wrapper to redirect stdout or stderr """def __init__(self, fp):self.fp = fpdef write(self, s):self.fp.write(bytes(s,'UTF-8'))def writelines(self, lines):self.fp.writelines(lines)def flush(self):self.fp.flush()stdout_redirector = OutputRedirector(sys.stdout)
stderr_redirector = OutputRedirector(sys.stderr)# ----------------------------------------------------------------------
# Templateclass Template_mixin(object):"""Define a HTML template for report customerization and generation.Overall structure of an HTML reportHTML+------------------------+|<html>                  ||  <head>                ||                        ||   STYLESHEET           ||   +----------------+   ||   |                |   ||   +----------------+   ||                        ||  </head>               ||                        ||  <body>                ||                        ||   HEADING              ||   +----------------+   ||   |                |   ||   +----------------+   ||                        ||   REPORT               ||   +----------------+   ||   |                |   ||   +----------------+   ||                        ||   ENDING               ||   +----------------+   ||   |                |   ||   +----------------+   ||                        ||  </body>               ||</html>                 |+------------------------+"""STATUS = {0: 'pass',1: 'fail',2: 'error',}DEFAULT_TITLE = 'Unit Test Report'DEFAULT_DESCRIPTION = ''# ------------------------------------------------------------------------# HTML TemplateHTML_TMPL = r"""<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>%(title)s</title><meta name="generator" content="%(generator)s"/><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>%(stylesheet)s
</head>
<body>
<script language="javascript" type="text/javascript"><!--
output_list = Array();/* level - 0:Summary; 1:Failed; 2:All */
function showCase(level) {trs = document.getElementsByTagName("tr");for (var i = 0; i < trs.length; i++) {tr = trs[i];id = tr.id;if (id.substr(0,2) == 'ft') {if (level < 1) {tr.className = 'hiddenRow';}else {tr.className = '';}}if (id.substr(0,2) == 'pt') {if (level > 1) {tr.className = '';}else {tr.className = 'hiddenRow';}}}
}function showClassDetail(cid, count) {var id_list = Array(count);var toHide = 1;for (var i = 0; i < count; i++) {tid0 = 't' + cid.substr(1) + '.' + (i+1);tid = 'f' + tid0;tr = document.getElementById(tid);if (!tr) {tid = 'p' + tid0;tr = document.getElementById(tid);}id_list[i] = tid;if (tr.className) {toHide = 0;}}for (var i = 0; i < count; i++) {tid = id_list[i];if (toHide) {document.getElementById('div_'+tid).style.display = 'none'document.getElementById(tid).className = 'hiddenRow';}else {document.getElementById(tid).className = '';}}
}function showTestDetail(div_id){var details_div = document.getElementById(div_id)var displayState = details_div.style.display// alert(displayState)if (displayState != 'block' ) {displayState = 'block'details_div.style.display = 'block'}else {details_div.style.display = 'none'}
}function html_escape(s) {s = s.replace(/&/g,'&amp;');s = s.replace(/</g,'&lt;');s = s.replace(/>/g,'&gt;');return s;
}/* obsoleted by detail in <div>
function showOutput(id, name) {var w = window.open("", //urlname,"resizable,scrollbars,status,width=800,height=450");d = w.document;d.write("<pre>");d.write(html_escape(output_list[id]));d.write("\n");d.write("<a href='javascript:window.close()'>close</a>\n");d.write("</pre>\n");d.close();
}
*/
--></script>%(heading)s
%(report)s
%(ending)s</body>
</html>
"""# variables: (title, generator, stylesheet, heading, report, ending)# ------------------------------------------------------------------------# Stylesheet## alternatively use a <link> for external style sheet, e.g.#   <link rel="stylesheet" href="$url" type="text/css">STYLESHEET_TMPL = """
<style type="text/css" media="screen">
body        { font-family: verdana, arial, helvetica, sans-serif; font-size: 80%; }
table       { font-size: 100%; }
pre         { }/* -- heading ---------------------------------------------------------------------- */
h1 {font-size: 16pt;color: gray;
}
.heading {margin-top: 0ex;margin-bottom: 1ex;
}.heading .attribute {margin-top: 1ex;margin-bottom: 0;
}.heading .description {margin-top: 4ex;margin-bottom: 6ex;
}/* -- css div popup ------------------------------------------------------------------------ */
a.popup_link {
}a.popup_link:hover {color: red;
}.popup_window {display: none;position: relative;left: 0px;top: 0px;/*border: solid #627173 1px; */padding: 10px;background-color: #E6E6D6;font-family: "Lucida Console", "Courier New", Courier, monospace;text-align: left;font-size: 8pt;width: 500px;
}}
/* -- report ------------------------------------------------------------------------ */
#show_detail_line {margin-top: 3ex;margin-bottom: 1ex;
}
#result_table {width: 80%;border-collapse: collapse;border: 1px solid #777;
}
#header_row {font-weight: bold;color: white;background-color: #777;
}
#result_table td {border: 1px solid #777;padding: 2px;
}
#total_row  { font-weight: bold; }
.passClass  { background-color: #6c6; }
.failClass  { background-color: #c60; }
.errorClass { background-color: #c00; }
.passCase   { color: #6c6; }
.failCase   { color: #c60; font-weight: bold; }
.errorCase  { color: #c00; font-weight: bold; }
.hiddenRow  { display: none; }
.testcase   { margin-left: 2em; }/* -- ending ---------------------------------------------------------------------- */
#ending {
}</style>
"""# ------------------------------------------------------------------------# Heading#HEADING_TMPL = """<div class='heading'>
<h1>%(title)s</h1>
%(parameters)s
<p class='description'>%(description)s</p>
</div>""" # variables: (title, parameters, description)HEADING_ATTRIBUTE_TMPL = """<p class='attribute'><strong>%(name)s:</strong> %(value)s</p>
""" # variables: (name, value)# ------------------------------------------------------------------------# Report#REPORT_TMPL = """
<p id='show_detail_line'>Show
<a href='javascript:showCase(0)'>Summary</a>
<a href='javascript:showCase(1)'>Failed</a>
<a href='javascript:showCase(2)'>All</a>
</p>
<table id='result_table'>
<colgroup>
<col align='left' />
<col align='right' />
<col align='right' />
<col align='right' />
<col align='right' />
<col align='right' />
</colgroup>
<tr id='header_row'><td>Test Group/Test case</td><td>Count</td><td>Pass</td><td>Fail</td><td>Error</td><td>View</td>
</tr>
%(test_list)s
<tr id='total_row'><td>Total</td><td>%(count)s</td><td>%(Pass)s</td><td>%(fail)s</td><td>%(error)s</td><td>&nbsp;</td>
</tr>
</table>
""" # variables: (test_list, count, Pass, fail, error)REPORT_CLASS_TMPL = r"""
<tr class='%(style)s'><td>%(desc)s</td><td>%(count)s</td><td>%(Pass)s</td><td>%(fail)s</td><td>%(error)s</td><td><a href="javascript:showClassDetail('%(cid)s',%(count)s)">Detail</a></td>
</tr>
""" # variables: (style, desc, count, Pass, fail, error, cid)REPORT_TEST_WITH_OUTPUT_TMPL = r"""
<tr id='%(tid)s' class='%(Class)s'><td class='%(style)s'><div class='testcase'>%(desc)s</div></td><td colspan='5' align='center'><!--css div popup start--><a class="popup_link" onfocus='this.blur();' href="javascript:showTestDetail('div_%(tid)s')" >%(status)s</a><div id='div_%(tid)s' class="popup_window"><div style='text-align: right; color:red;cursor:pointer'><a onfocus='this.blur();' onclick="document.getElementById('div_%(tid)s').style.display = 'none' " >[x]</a></div><pre>%(script)s</pre></div><!--css div popup end--></td>
</tr>
""" # variables: (tid, Class, style, desc, status)REPORT_TEST_NO_OUTPUT_TMPL = r"""
<tr id='%(tid)s' class='%(Class)s'><td class='%(style)s'><div class='testcase'>%(desc)s</div></td><td colspan='5' align='center'>%(status)s</td>
</tr>
""" # variables: (tid, Class, style, desc, status)REPORT_TEST_OUTPUT_TMPL = r"""
%(id)s: %(output)s
""" # variables: (id, output)# ------------------------------------------------------------------------# ENDING#ENDING_TMPL = """<div id='ending'>&nbsp;</div>"""# -------------------- The end of the Template class -------------------TestResult = unittest.TestResultclass _TestResult(TestResult):# note: _TestResult is a pure representation of results.# It lacks the output and reporting ability compares to unittest._TextTestResult.def __init__(self, verbosity=1):TestResult.__init__(self)self.stdout0 = Noneself.stderr0 = Noneself.success_count = 0self.failure_count = 0self.error_count = 0self.verbosity = verbosity# result is a list of result in 4 tuple# (#   result code (0: success; 1: fail; 2: error),#   TestCase object,#   Test output (byte string),#   stack trace,# )self.result = []def startTest(self, test):TestResult.startTest(self, test)# just one buffer for both stdout and stderrself.outputBuffer = io.StringIO()stdout_redirector.fp = self.outputBufferstderr_redirector.fp = self.outputBufferself.stdout0 = sys.stdoutself.stderr0 = sys.stderrsys.stdout = stdout_redirectorsys.stderr = stderr_redirectordef complete_output(self):"""Disconnect output redirection and return buffer.Safe to call multiple times."""if self.stdout0:sys.stdout = self.stdout0sys.stderr = self.stderr0self.stdout0 = Noneself.stderr0 = Nonereturn self.outputBuffer.getvalue()def stopTest(self, test):# Usually one of addSuccess, addError or addFailure would have been called.# But there are some path in unittest that would bypass this.# We must disconnect stdout in stopTest(), which is guaranteed to be called.self.complete_output()def addSuccess(self, test):self.success_count += 1TestResult.addSuccess(self, test)output = self.complete_output()self.result.append((0, test, output, ''))if self.verbosity > 1:sys.stderr.write('ok ')sys.stderr.write(str(test))sys.stderr.write('\n')else:sys.stderr.write('.')def addError(self, test, err):self.error_count += 1TestResult.addError(self, test, err)_, _exc_str = self.errors[-1]output = self.complete_output()self.result.append((2, test, output, _exc_str))if self.verbosity > 1:sys.stderr.write('E  ')sys.stderr.write(str(test))sys.stderr.write('\n')else:sys.stderr.write('E')def addFailure(self, test, err):self.failure_count += 1TestResult.addFailure(self, test, err)_, _exc_str = self.failures[-1]output = self.complete_output()self.result.append((1, test, output, _exc_str))if self.verbosity > 1:sys.stderr.write('F  ')sys.stderr.write(str(test))sys.stderr.write('\n')else:sys.stderr.write('F')class HTMLTestRunner(Template_mixin):""""""def __init__(self, stream=sys.stdout, verbosity=1, title=None, description=None):self.stream = streamself.verbosity = verbosityif title is None:self.title = self.DEFAULT_TITLEelse:self.title = titleif description is None:self.description = self.DEFAULT_DESCRIPTIONelse:self.description = descriptionself.startTime = datetime.datetime.now()def run(self, test):"Run the given test case or test suite."result = _TestResult(self.verbosity)test(result)self.stopTime = datetime.datetime.now()self.generateReport(test, result)print('\nTime Elapsed: %s' % (self.stopTime-self.startTime))return resultdef sortResult(self, result_list):# unittest does not seems to run in any particular order.# Here at least we want to group them together by class.rmap = {}classes = []for n,t,o,e in result_list:cls = t.__class__if not cls in rmap:rmap[cls] = []classes.append(cls)rmap[cls].append((n,t,o,e))r = [(cls, rmap[cls]) for cls in classes]return rdef getReportAttributes(self, result):"""Return report attributes as a list of (name, value).Override this to add custom attributes."""startTime = str(self.startTime)[:19]duration = str(self.stopTime - self.startTime)status = []if result.success_count: status.append('Pass %s'    % result.success_count)if result.failure_count: status.append('Failure %s' % result.failure_count)if result.error_count:   status.append('Error %s'   % result.error_count  )if status:status = ' '.join(status)else:status = 'none'return [('Start Time', startTime),('Duration', duration),('Status', status),]def generateReport(self, test, result):report_attrs = self.getReportAttributes(result)generator = 'HTMLTestRunner %s' % __version__stylesheet = self._generate_stylesheet()heading = self._generate_heading(report_attrs)report = self._generate_report(result)ending = self._generate_ending()output = self.HTML_TMPL % dict(title = saxutils.escape(self.title),generator = generator,stylesheet = stylesheet,heading = heading,report = report,ending = ending,)self.stream.write(output.encode('utf8'))def _generate_stylesheet(self):return self.STYLESHEET_TMPLdef _generate_heading(self, report_attrs):a_lines = []for name, value in report_attrs:line = self.HEADING_ATTRIBUTE_TMPL % dict(name = saxutils.escape(name),value = saxutils.escape(value),)a_lines.append(line)heading = self.HEADING_TMPL % dict(title = saxutils.escape(self.title),parameters = ''.join(a_lines),description = saxutils.escape(self.description),)return headingdef _generate_report(self, result):rows = []sortedResult = self.sortResult(result.result)for cid, (cls, cls_results) in enumerate(sortedResult):# subtotal for a classnp = nf = ne = 0for n,t,o,e in cls_results:if n == 0: np += 1elif n == 1: nf += 1else: ne += 1# format class descriptionif cls.__module__ == "__main__":name = cls.__name__else:name = "%s.%s" % (cls.__module__, cls.__name__)doc = cls.__doc__ and cls.__doc__.split("\n")[0] or ""desc = doc and '%s: %s' % (name, doc) or namerow = self.REPORT_CLASS_TMPL % dict(style = ne > 0 and 'errorClass' or nf > 0 and 'failClass' or 'passClass',desc = desc,count = np+nf+ne,Pass = np,fail = nf,error = ne,cid = 'c%s' % (cid+1),)rows.append(row)for tid, (n,t,o,e) in enumerate(cls_results):self._generate_report_test(rows, cid, tid, n, t, o, e)report = self.REPORT_TMPL % dict(test_list = ''.join(rows),count = str(result.success_count+result.failure_count+result.error_count),Pass = str(result.success_count),fail = str(result.failure_count),error = str(result.error_count),)return reportdef _generate_report_test(self, rows, cid, tid, n, t, o, e):# e.g. 'pt1.1', 'ft1.1', etchas_output = bool(o or e)tid = (n == 0 and 'p' or 'f') + 't%s.%s' % (cid+1,tid+1)name = t.id().split('.')[-1]doc = t.shortDescription() or ""desc = doc and ('%s: %s' % (name, doc)) or nametmpl = has_output and self.REPORT_TEST_WITH_OUTPUT_TMPL or self.REPORT_TEST_NO_OUTPUT_TMPL# o and e should be byte string because they are collected from stdout and stderr?if isinstance(o,str):# TODO: some problem with 'string_escape': it escape \n and mess up formating# uo = unicode(o.encode('string_escape'))uo = oelse:uo = o.decode('utf-8')if isinstance(e,str):# TODO: some problem with 'string_escape': it escape \n and mess up formating# ue = unicode(e.encode('string_escape'))ue = eelse:ue = e.decode('utf-8')script = self.REPORT_TEST_OUTPUT_TMPL % dict(id = tid,output = saxutils.escape(uo+ue),)row = tmpl % dict(tid = tid,Class = (n == 0 and 'hiddenRow' or 'none'),style = n == 2 and 'errorCase' or (n == 1 and 'failCase' or 'none'),desc = desc,script = script,status = self.STATUS[n],)rows.append(row)if not has_output:returndef _generate_ending(self):return self.ENDING_TMPL##############################################################################
# Facilities for running tests from the command line
############################################################################### Note: Reuse unittest.TestProgram to launch test. In the future we may
# build our own launcher to support more specific command line
# parameters like test title, CSS, etc.
class TestProgram(unittest.TestProgram):"""A variation of the unittest.TestProgram. Please refer to the baseclass for command line parameters."""def runTests(self):# Pick HTMLTestRunner as the default test runner.# base class's testRunner parameter is not useful because it means# we have to instantiate HTMLTestRunner before we know self.verbosity.if self.testRunner is None:self.testRunner = HTMLTestRunner(verbosity=self.verbosity)unittest.TestProgram.runTests(self)main = TestProgram##############################################################################
# Executing this module from the command line
##############################################################################if __name__ == "__main__":main(module=None)

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