Update changelog.

[youtubedl] / test / test_utils.py

diff --git a/test/test_utils.py b/test/test_utils.py
index f31559e71f60f9474aa51ae36dbbc3e24affd5ce..9e28e008f5548f28598e38a64ad18165eecd463a 100644 (file)
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -42,6 +42,7 @@ from youtube_dl.utils import (
     is_html,
     js_to_json,
     limit_length,
     is_html,
     js_to_json,
     limit_length,

+    merge_dicts,

     mimetype2ext,
     month_by_name,
     multipart_encode,
     mimetype2ext,
     month_by_name,
     multipart_encode,


@@ -53,10 +54,12 @@ from youtube_dl.utils import (
     parse_filesize,
     parse_count,
     parse_iso8601,
     parse_filesize,
     parse_count,
     parse_iso8601,

+    parse_resolution,

     pkcs1pad,
     read_batch_urls,
     sanitize_filename,
     sanitize_path,
     pkcs1pad,
     read_batch_urls,
     sanitize_filename,
     sanitize_path,

+    sanitize_url,

     expand_path,
     prepend_extension,
     replace_extension,
     expand_path,
     prepend_extension,
     replace_extension,


@@ -75,6 +78,7 @@ from youtube_dl.utils import (
     uppercase_escape,
     lowercase_escape,
     url_basename,
     uppercase_escape,
     lowercase_escape,
     url_basename,

+    url_or_none,

     base_url,
     urljoin,
     urlencode_postdata,
     base_url,
     urljoin,
     urlencode_postdata,


@@ -98,6 +102,7 @@ from youtube_dl.compat import (
     compat_chr,
     compat_etree_fromstring,
     compat_getenv,
     compat_chr,
     compat_etree_fromstring,
     compat_getenv,

+    compat_os_name,

     compat_setenv,
     compat_urlparse,
     compat_parse_qs,
     compat_setenv,
     compat_urlparse,
     compat_parse_qs,


@@ -218,6 +223,12 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(sanitize_path('./abc'), 'abc')
         self.assertEqual(sanitize_path('./../abc'), '..\\abc')
 
         self.assertEqual(sanitize_path('./abc'), 'abc')
         self.assertEqual(sanitize_path('./../abc'), '..\\abc')
 

+    def test_sanitize_url(self):
+        self.assertEqual(sanitize_url('//foo.bar'), 'http://foo.bar')
+        self.assertEqual(sanitize_url('httpss://foo.bar'), 'https://foo.bar')
+        self.assertEqual(sanitize_url('rmtps://foo.bar'), 'rtmps://foo.bar')
+        self.assertEqual(sanitize_url('https://foo.bar'), 'https://foo.bar')
+

     def test_expand_path(self):
         def env(var):
             return '%{0}%'.format(var) if sys.platform == 'win32' else '${0}'.format(var)
     def test_expand_path(self):
         def env(var):
             return '%{0}%'.format(var) if sys.platform == 'win32' else '${0}'.format(var)


@@ -278,6 +289,7 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(unescapeHTML('/'), '/')
         self.assertEqual(unescapeHTML('é'), 'é')
         self.assertEqual(unescapeHTML('�'), '�')
         self.assertEqual(unescapeHTML('/'), '/')
         self.assertEqual(unescapeHTML('é'), 'é')
         self.assertEqual(unescapeHTML('�'), '�')

+        self.assertEqual(unescapeHTML('&a"'), '&a"')

         # HTML5 entities
         self.assertEqual(unescapeHTML('.''), '.\'')
 
         # HTML5 entities
         self.assertEqual(unescapeHTML('.''), '.\'')
 


@@ -340,6 +352,9 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(unified_timestamp('May 16, 2016 11:15 PM'), 1463440500)
         self.assertEqual(unified_timestamp('Feb 7, 2016 at 6:35 pm'), 1454870100)
         self.assertEqual(unified_timestamp('2017-03-30T17:52:41Q'), 1490896361)
         self.assertEqual(unified_timestamp('May 16, 2016 11:15 PM'), 1463440500)
         self.assertEqual(unified_timestamp('Feb 7, 2016 at 6:35 pm'), 1454870100)
         self.assertEqual(unified_timestamp('2017-03-30T17:52:41Q'), 1490896361)

+        self.assertEqual(unified_timestamp('Sep 11, 2013 | 5:49 AM'), 1378878540)
+        self.assertEqual(unified_timestamp('December 15, 2017 at 7:49 am'), 1513324140)
+        self.assertEqual(unified_timestamp('2018-03-14T08:32:43.1493874+00:00'), 1521016363)

 
     def test_determine_ext(self):
         self.assertEqual(determine_ext('http://example.com/foo/bar.mp4/?download'), 'mp4')
 
     def test_determine_ext(self):
         self.assertEqual(determine_ext('http://example.com/foo/bar.mp4/?download'), 'mp4')


@@ -347,6 +362,7 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(determine_ext('http://example.com/foo/bar.nonext/?download', None), None)
         self.assertEqual(determine_ext('http://example.com/foo/bar/mp4?download', None), None)
         self.assertEqual(determine_ext('http://example.com/foo/bar.m3u8//?download'), 'm3u8')
         self.assertEqual(determine_ext('http://example.com/foo/bar.nonext/?download', None), None)
         self.assertEqual(determine_ext('http://example.com/foo/bar/mp4?download', None), None)
         self.assertEqual(determine_ext('http://example.com/foo/bar.m3u8//?download'), 'm3u8')

+        self.assertEqual(determine_ext('foobar', None), None)

 
     def test_find_xpath_attr(self):
         testxml = '''<root>
 
     def test_find_xpath_attr(self):
         testxml = '''<root>


@@ -447,7 +463,9 @@ class TestUtil(unittest.TestCase):
 
     def test_shell_quote(self):
         args = ['ffmpeg', '-i', encodeFilename('ñ€ß\'.mp4')]
 
     def test_shell_quote(self):
         args = ['ffmpeg', '-i', encodeFilename('ñ€ß\'.mp4')]

-        self.assertEqual(shell_quote(args), """ffmpeg -i 'ñ€ß'"'"'.mp4'""")
+        self.assertEqual(
+            shell_quote(args),
+            """ffmpeg -i 'ñ€ß'"'"'.mp4'""" if compat_os_name != 'nt' else '''ffmpeg -i "ñ€ß'.mp4"''')

 
     def test_str_to_int(self):
         self.assertEqual(str_to_int('123,456'), 123456)
 
     def test_str_to_int(self):
         self.assertEqual(str_to_int('123,456'), 123456)


@@ -490,6 +508,16 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(urljoin('http://foo.de/', ['foobar']), None)
         self.assertEqual(urljoin('http://foo.de/a/b/c.txt', '.././../d.txt'), 'http://foo.de/d.txt')
 
         self.assertEqual(urljoin('http://foo.de/', ['foobar']), None)
         self.assertEqual(urljoin('http://foo.de/a/b/c.txt', '.././../d.txt'), 'http://foo.de/d.txt')
 

+    def test_url_or_none(self):
+        self.assertEqual(url_or_none(None), None)
+        self.assertEqual(url_or_none(''), None)
+        self.assertEqual(url_or_none('foo'), None)
+        self.assertEqual(url_or_none('http://foo.de'), 'http://foo.de')
+        self.assertEqual(url_or_none('https://foo.de'), 'https://foo.de')
+        self.assertEqual(url_or_none('http$://foo.de'), None)
+        self.assertEqual(url_or_none('http://foo.de'), 'http://foo.de')
+        self.assertEqual(url_or_none('//foo.de'), '//foo.de')
+

     def test_parse_age_limit(self):
         self.assertEqual(parse_age_limit(None), None)
         self.assertEqual(parse_age_limit(False), None)
     def test_parse_age_limit(self):
         self.assertEqual(parse_age_limit(None), None)
         self.assertEqual(parse_age_limit(False), None)


@@ -503,6 +531,8 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(parse_age_limit('PG-13'), 13)
         self.assertEqual(parse_age_limit('TV-14'), 14)
         self.assertEqual(parse_age_limit('TV-MA'), 17)
         self.assertEqual(parse_age_limit('PG-13'), 13)
         self.assertEqual(parse_age_limit('TV-14'), 14)
         self.assertEqual(parse_age_limit('TV-MA'), 17)

+        self.assertEqual(parse_age_limit('TV14'), 14)
+        self.assertEqual(parse_age_limit('TV_G'), 0)

 
     def test_parse_duration(self):
         self.assertEqual(parse_duration(None), None)
 
     def test_parse_duration(self):
         self.assertEqual(parse_duration(None), None)


@@ -535,6 +565,7 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(parse_duration('87 Min.'), 5220)
         self.assertEqual(parse_duration('PT1H0.040S'), 3600.04)
         self.assertEqual(parse_duration('PT00H03M30SZ'), 210)
         self.assertEqual(parse_duration('87 Min.'), 5220)
         self.assertEqual(parse_duration('PT1H0.040S'), 3600.04)
         self.assertEqual(parse_duration('PT00H03M30SZ'), 210)

+        self.assertEqual(parse_duration('P0Y0M0DT0H4M20.880S'), 260.88)

 
     def test_fix_xml_ampersands(self):
         self.assertEqual(
 
     def test_fix_xml_ampersands(self):
         self.assertEqual(


@@ -653,6 +684,17 @@ class TestUtil(unittest.TestCase):
             self.assertEqual(dict_get(d, ('b', 'c', key, )), None)
             self.assertEqual(dict_get(d, ('b', 'c', key, ), skip_false_values=False), false_value)
 
             self.assertEqual(dict_get(d, ('b', 'c', key, )), None)
             self.assertEqual(dict_get(d, ('b', 'c', key, ), skip_false_values=False), false_value)
 

+    def test_merge_dicts(self):
+        self.assertEqual(merge_dicts({'a': 1}, {'b': 2}), {'a': 1, 'b': 2})
+        self.assertEqual(merge_dicts({'a': 1}, {'a': 2}), {'a': 1})
+        self.assertEqual(merge_dicts({'a': 1}, {'a': None}), {'a': 1})
+        self.assertEqual(merge_dicts({'a': 1}, {'a': ''}), {'a': 1})
+        self.assertEqual(merge_dicts({'a': 1}, {}), {'a': 1})
+        self.assertEqual(merge_dicts({'a': None}, {'a': 1}), {'a': 1})
+        self.assertEqual(merge_dicts({'a': ''}, {'a': 1}), {'a': ''})
+        self.assertEqual(merge_dicts({'a': ''}, {'a': 'abc'}), {'a': 'abc'})
+        self.assertEqual(merge_dicts({'a': None}, {'a': ''}, {'a': 'abc'}), {'a': 'abc'})
+

     def test_encode_compat_str(self):
         self.assertEqual(encode_compat_str(b'\xd1\x82\xd0\xb5\xd1\x81\xd1\x82', 'utf-8'), 'тест')
         self.assertEqual(encode_compat_str('тест', 'utf-8'), 'тест')
     def test_encode_compat_str(self):
         self.assertEqual(encode_compat_str(b'\xd1\x82\xd0\xb5\xd1\x81\xd1\x82', 'utf-8'), 'тест')
         self.assertEqual(encode_compat_str('тест', 'utf-8'), 'тест')


@@ -678,6 +720,18 @@ class TestUtil(unittest.TestCase):
         d = json.loads(stripped)
         self.assertEqual(d, {'status': 'success'})
 
         d = json.loads(stripped)
         self.assertEqual(d, {'status': 'success'})
 

+        stripped = strip_jsonp('window.cb && window.cb({"status": "success"});')
+        d = json.loads(stripped)
+        self.assertEqual(d, {'status': 'success'})
+
+        stripped = strip_jsonp('window.cb && cb({"status": "success"});')
+        d = json.loads(stripped)
+        self.assertEqual(d, {'status': 'success'})
+
+        stripped = strip_jsonp('({"status": "success"});')
+        d = json.loads(stripped)
+        self.assertEqual(d, {'status': 'success'})
+

     def test_uppercase_escape(self):
         self.assertEqual(uppercase_escape('aä'), 'aä')
         self.assertEqual(uppercase_escape('\\U0001d550'), '𝕐')
     def test_uppercase_escape(self):
         self.assertEqual(uppercase_escape('aä'), 'aä')
         self.assertEqual(uppercase_escape('\\U0001d550'), '𝕐')


@@ -731,6 +785,10 @@ class TestUtil(unittest.TestCase):
             'vcodec': 'h264',
             'acodec': 'aac',
         })
             'vcodec': 'h264',
             'acodec': 'aac',
         })

+        self.assertEqual(parse_codecs('av01.0.05M.08'), {
+            'vcodec': 'av01.0.05M.08',
+            'acodec': 'none',
+        })

 
     def test_escape_rfc3986(self):
         reserved = "!*'();:@&=+$,/?#[]"
 
     def test_escape_rfc3986(self):
         reserved = "!*'();:@&=+$,/?#[]"


@@ -799,6 +857,9 @@ class TestUtil(unittest.TestCase):
         inp = '''{"duration": "00:01:07"}'''
         self.assertEqual(js_to_json(inp), '''{"duration": "00:01:07"}''')
 
         inp = '''{"duration": "00:01:07"}'''
         self.assertEqual(js_to_json(inp), '''{"duration": "00:01:07"}''')
 

+        inp = '''{segments: [{"offset":-3.885780586188048e-16,"duration":39.75000000000001}]}'''
+        self.assertEqual(js_to_json(inp), '''{"segments": [{"offset":-3.885780586188048e-16,"duration":39.75000000000001}]}''')
+

     def test_js_to_json_edgecases(self):
         on = js_to_json("{abc_def:'1\\'\\\\2\\\\\\'3\"4'}")
         self.assertEqual(json.loads(on), {"abc_def": "1'\\2\\'3\"4"})
     def test_js_to_json_edgecases(self):
         on = js_to_json("{abc_def:'1\\'\\\\2\\\\\\'3\"4'}")
         self.assertEqual(json.loads(on), {"abc_def": "1'\\2\\'3\"4"})


@@ -870,6 +931,13 @@ class TestUtil(unittest.TestCase):
         on = js_to_json('{/*comment\n*/42/*comment\n*/:/*comment\n*/42/*comment\n*/}')
         self.assertEqual(json.loads(on), {'42': 42})
 
         on = js_to_json('{/*comment\n*/42/*comment\n*/:/*comment\n*/42/*comment\n*/}')
         self.assertEqual(json.loads(on), {'42': 42})
 

+        on = js_to_json('{42:4.2e1}')
+        self.assertEqual(json.loads(on), {'42': 42.0})
+
+    def test_js_to_json_malformed(self):
+        self.assertEqual(js_to_json('42a1'), '42"a1"')
+        self.assertEqual(js_to_json('42a-1'), '42"a"-1')
+

     def test_extract_attributes(self):
         self.assertEqual(extract_attributes('<e x="y">'), {'x': 'y'})
         self.assertEqual(extract_attributes("<e x='y'>"), {'x': 'y'})
     def test_extract_attributes(self):
         self.assertEqual(extract_attributes('<e x="y">'), {'x': 'y'})
         self.assertEqual(extract_attributes("<e x='y'>"), {'x': 'y'})


@@ -907,6 +975,8 @@ class TestUtil(unittest.TestCase):
             supports_outside_bmp = False
         if supports_outside_bmp:
             self.assertEqual(extract_attributes('<e x="Smile &#128512;!">'), {'x': 'Smile \U0001f600!'})
             supports_outside_bmp = False
         if supports_outside_bmp:
             self.assertEqual(extract_attributes('<e x="Smile &#128512;!">'), {'x': 'Smile \U0001f600!'})

+        # Malformed HTML should not break attributes extraction on older Python
+        self.assertEqual(extract_attributes('<mal"formed/>'), {})

 
     def test_clean_html(self):
         self.assertEqual(clean_html('a:\nb'), 'a: b')
 
     def test_clean_html(self):
         self.assertEqual(clean_html('a:\nb'), 'a: b')


@@ -921,7 +991,7 @@ class TestUtil(unittest.TestCase):
     def test_args_to_str(self):
         self.assertEqual(
             args_to_str(['foo', 'ba/r', '-baz', '2 be', '']),
     def test_args_to_str(self):
         self.assertEqual(
             args_to_str(['foo', 'ba/r', '-baz', '2 be', '']),

-            'foo ba/r -baz \'2 be\' \'\''
+            'foo ba/r -baz \'2 be\' \'\'' if compat_os_name != 'nt' else 'foo ba/r -baz "2 be" ""'

         )
 
     def test_parse_filesize(self):
         )
 
     def test_parse_filesize(self):


@@ -948,6 +1018,16 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(parse_count('1.1kk '), 1100000)
         self.assertEqual(parse_count('1.1kk views'), 1100000)
 
         self.assertEqual(parse_count('1.1kk '), 1100000)
         self.assertEqual(parse_count('1.1kk views'), 1100000)
 

+    def test_parse_resolution(self):
+        self.assertEqual(parse_resolution(None), {})
+        self.assertEqual(parse_resolution(''), {})
+        self.assertEqual(parse_resolution('1920x1080'), {'width': 1920, 'height': 1080})
+        self.assertEqual(parse_resolution('1920×1080'), {'width': 1920, 'height': 1080})
+        self.assertEqual(parse_resolution('1920 x 1080'), {'width': 1920, 'height': 1080})
+        self.assertEqual(parse_resolution('720p'), {'height': 720})
+        self.assertEqual(parse_resolution('4k'), {'height': 2160})
+        self.assertEqual(parse_resolution('8K'), {'height': 4320})
+

     def test_version_tuple(self):
         self.assertEqual(version_tuple('1'), (1,))
         self.assertEqual(version_tuple('10.23.344'), (10, 23, 344))
     def test_version_tuple(self):
         self.assertEqual(version_tuple('1'), (1,))
         self.assertEqual(version_tuple('10.23.344'), (10, 23, 344))


@@ -1026,6 +1106,18 @@ ffmpeg version 2.4.4 Copyright (c) 2000-2014 the FFmpeg ...'''), '2.4.4')
         self.assertFalse(match_str(
             'like_count > 100 & dislike_count <? 50 & description',
             {'like_count': 190, 'dislike_count': 10}))
         self.assertFalse(match_str(
             'like_count > 100 & dislike_count <? 50 & description',
             {'like_count': 190, 'dislike_count': 10}))

+        self.assertTrue(match_str('is_live', {'is_live': True}))
+        self.assertFalse(match_str('is_live', {'is_live': False}))
+        self.assertFalse(match_str('is_live', {'is_live': None}))
+        self.assertFalse(match_str('is_live', {}))
+        self.assertFalse(match_str('!is_live', {'is_live': True}))
+        self.assertTrue(match_str('!is_live', {'is_live': False}))
+        self.assertTrue(match_str('!is_live', {'is_live': None}))
+        self.assertTrue(match_str('!is_live', {}))
+        self.assertTrue(match_str('title', {'title': 'abc'}))
+        self.assertTrue(match_str('title', {'title': ''}))
+        self.assertFalse(match_str('!title', {'title': 'abc'}))
+        self.assertFalse(match_str('!title', {'title': ''}))

 
     def test_parse_dfxp_time_expr(self):
         self.assertEqual(parse_dfxp_time_expr(None), None)
 
     def test_parse_dfxp_time_expr(self):
         self.assertEqual(parse_dfxp_time_expr(None), None)


@@ -1049,7 +1141,7 @@ ffmpeg version 2.4.4 Copyright (c) 2000-2014 the FFmpeg ...'''), '2.4.4')
                     <p begin="3" dur="-1">Ignored, three</p>
                 </div>
             </body>
                     <p begin="3" dur="-1">Ignored, three</p>
                 </div>
             </body>

-            </tt>'''
+            </tt>'''.encode('utf-8')

         srt_data = '''1
 00:00:00,000 --> 00:00:01,000
 The following line contains Chinese characters and special symbols
         srt_data = '''1
 00:00:00,000 --> 00:00:01,000
 The following line contains Chinese characters and special symbols


@@ -1074,7 +1166,7 @@ Line
                     <p begin="0" end="1">The first line</p>
                 </div>
             </body>
                     <p begin="0" end="1">The first line</p>
                 </div>
             </body>

-            </tt>'''
+            </tt>'''.encode('utf-8')

         srt_data = '''1
 00:00:00,000 --> 00:00:01,000
 The first line
         srt_data = '''1
 00:00:00,000 --> 00:00:01,000
 The first line


@@ -1100,7 +1192,7 @@ The first line
       <p style="s1" tts:textDecoration="underline" begin="00:00:09.56" id="p2" end="00:00:12.36"><span style="s2" tts:color="lime">inner<br /> </span>style</p>
     </div>
   </body>
       <p style="s1" tts:textDecoration="underline" begin="00:00:09.56" id="p2" end="00:00:12.36"><span style="s2" tts:color="lime">inner<br /> </span>style</p>
     </div>
   </body>

-</tt>'''
+</tt>'''.encode('utf-8')

         srt_data = '''1
 00:00:02,080 --> 00:00:05,839
 <font color="white" face="sansSerif" size="16">default style<font color="red">custom style</font></font>
         srt_data = '''1
 00:00:02,080 --> 00:00:05,839
 <font color="white" face="sansSerif" size="16">default style<font color="red">custom style</font></font>


@@ -1123,6 +1215,26 @@ part 3</font></u>
 '''
         self.assertEqual(dfxp2srt(dfxp_data_with_style), srt_data)
 
 '''
         self.assertEqual(dfxp2srt(dfxp_data_with_style), srt_data)
 

+        dfxp_data_non_utf8 = '''<?xml version="1.0" encoding="UTF-16"?>
+            <tt xmlns="http://www.w3.org/ns/ttml" xml:lang="en" xmlns:tts="http://www.w3.org/ns/ttml#parameter">
+            <body>
+                <div xml:lang="en">
+                    <p begin="0" end="1">Line 1</p>
+                    <p begin="1" end="2">第二行</p>
+                </div>
+            </body>
+            </tt>'''.encode('utf-16')
+        srt_data = '''1
+00:00:00,000 --> 00:00:01,000
+Line 1
+
+2
+00:00:01,000 --> 00:00:02,000
+第二行
+
+'''
+        self.assertEqual(dfxp2srt(dfxp_data_non_utf8), srt_data)
+

     def test_cli_option(self):
         self.assertEqual(cli_option({'proxy': '127.0.0.1:3128'}, '--proxy', 'proxy'), ['--proxy', '127.0.0.1:3128'])
         self.assertEqual(cli_option({'proxy': None}, '--proxy', 'proxy'), [])
     def test_cli_option(self):
         self.assertEqual(cli_option({'proxy': '127.0.0.1:3128'}, '--proxy', 'proxy'), ['--proxy', '127.0.0.1:3128'])
         self.assertEqual(cli_option({'proxy': None}, '--proxy', 'proxy'), [])


@@ -1168,6 +1280,10 @@ part 3</font></u>
             cli_bool_option(
                 {'nocheckcertificate': False}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
             ['--check-certificate=true'])
             cli_bool_option(
                 {'nocheckcertificate': False}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
             ['--check-certificate=true'])

+        self.assertEqual(
+            cli_bool_option(
+                {}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
+            [])

 
     def test_ohdave_rsa_encrypt(self):
         N = 0xab86b6371b5318aaa1d3c9e612a9f1264f372323c8c0f19875b5fc3b3fd3afcc1e5bec527aa94bfa85bffc157e4245aebda05389a5357b75115ac94f074aefcd
 
     def test_ohdave_rsa_encrypt(self):
         N = 0xab86b6371b5318aaa1d3c9e612a9f1264f372323c8c0f19875b5fc3b3fd3afcc1e5bec527aa94bfa85bffc157e4245aebda05389a5357b75115ac94f074aefcd


@@ -1217,6 +1333,12 @@ part 3</font></u>
         self.assertEqual(get_element_by_attribute('class', 'foo', html), None)
         self.assertEqual(get_element_by_attribute('class', 'no-such-foo', html), None)
 
         self.assertEqual(get_element_by_attribute('class', 'foo', html), None)
         self.assertEqual(get_element_by_attribute('class', 'no-such-foo', html), None)
 

+        html = '''
+            <div itemprop="author" itemscope>foo</div>
+        '''
+
+        self.assertEqual(get_element_by_attribute('itemprop', 'author', html), 'foo')
+

     def test_get_elements_by_class(self):
         html = '''
             <span class="foo bar">nice</span><span class="foo bar">also nice</span>
     def test_get_elements_by_class(self):
         html = '''
             <span class="foo bar">nice</span><span class="foo bar">also nice</span>