Bump beautifulsoup4 from 4.10.0 to 4.11.1 (#1717)

* Bump beautifulsoup4 from 4.10.0 to 4.11.1

Bumps [beautifulsoup4](https://www.crummy.com/software/BeautifulSoup/bs4/) from 4.10.0 to 4.11.1.

---
updated-dependencies:
- dependency-name: beautifulsoup4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update beautifulsoup4==4.11.1

* Update soupsieve==2.3.2.post1

* Update requirements.txt

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/bs4/tests/test_element.py

@@ -0,0 +1,74 @@
+"""Tests of classes in element.py.
+
+The really big classes -- Tag, PageElement, and NavigableString --
+are tested in separate files.
+"""
+
+from bs4.element import (
+    CharsetMetaAttributeValue,
+    ContentMetaAttributeValue,
+    NamespacedAttribute,
+)
+from . import SoupTest
+
+
+class TestNamedspacedAttribute(object):
+
+    def test_name_may_be_none_or_missing(self):
+        a = NamespacedAttribute("xmlns", None)
+        assert a == "xmlns"
+
+        a = NamespacedAttribute("xmlns", "")
+        assert a == "xmlns"
+
+        a = NamespacedAttribute("xmlns")
+        assert a == "xmlns"
+        
+    def test_namespace_may_be_none_or_missing(self):
+        a = NamespacedAttribute(None, "tag")
+        assert a == "tag"
+        
+        a = NamespacedAttribute("", "tag")
+        assert a == "tag"
+        
+    def test_attribute_is_equivalent_to_colon_separated_string(self):
+        a = NamespacedAttribute("a", "b")
+        assert "a:b" == a
+
+    def test_attributes_are_equivalent_if_prefix_and_name_identical(self):
+        a = NamespacedAttribute("a", "b", "c")
+        b = NamespacedAttribute("a", "b", "c")
+        assert a == b
+
+        # The actual namespace is not considered.
+        c = NamespacedAttribute("a", "b", None)
+        assert a == c
+
+        # But name and prefix are important.
+        d = NamespacedAttribute("a", "z", "c")
+        assert a != d
+
+        e = NamespacedAttribute("z", "b", "c")
+        assert a != e
+
+
+class TestAttributeValueWithCharsetSubstitution(object):
+    """Certain attributes are designed to have the charset of the
+    final document substituted into their value.
+    """
+    
+    def test_content_meta_attribute_value(self):
+        # The value of a CharsetMetaAttributeValue is whatever
+        # encoding the string is in.
+        value = CharsetMetaAttributeValue("euc-jp")
+        assert "euc-jp" == value
+        assert "euc-jp" == value.original_value
+        assert "utf8" == value.encode("utf8")
+        assert "ascii" == value.encode("ascii")
+
+    def test_content_meta_attribute_value(self):
+        value = ContentMetaAttributeValue("text/html; charset=euc-jp")
+        assert "text/html; charset=euc-jp" == value
+        assert "text/html; charset=euc-jp" == value.original_value
+        assert "text/html; charset=utf8" == value.encode("utf8")
+        assert "text/html; charset=ascii" == value.encode("ascii")