diff --git a/lib/commonmarker.rb b/lib/commonmarker.rb
index edfc0e57..7d0f0cb2 100755
--- a/lib/commonmarker.rb
+++ b/lib/commonmarker.rb
@@ -12,32 +12,34 @@
   require "awesome_print"
 rescue LoadError; end # rubocop:disable Lint/SuppressedException
 module CommonMarker
-  # Public:  Parses a Markdown string into an HTML string.
-  #
-  # text - A {String} of text
-  # option - Either a {Symbol} or {Array of Symbol}s indicating the render options
-  # extensions - An {Array of Symbol}s indicating the extensions to use
-  #
-  # Returns a {String} of converted HTML.
-  def self.render_html(text, options = :DEFAULT, extensions = [])
-    raise TypeError, "text must be a String; got a #{text.class}!" unless text.is_a?(String)
+  class << self
+    # Public:  Parses a Markdown string into an HTML string.
+    #
+    # text - A {String} of text
+    # option - Either a {Symbol} or {Array of Symbol}s indicating the render options
+    # extensions - An {Array of Symbol}s indicating the extensions to use
+    #
+    # Returns a {String} of converted HTML.
+    def render_html(text, options = :DEFAULT, extensions = [])
+      raise TypeError, "text must be a String; got a #{text.class}!" unless text.is_a?(String)
 
-    opts = Config.process_options(options, :render)
-    Node.markdown_to_html(text.encode("UTF-8"), opts, extensions)
-  end
+      opts = Config.process_options(options, :render)
+      Node.markdown_to_html(text.encode("UTF-8"), opts, extensions)
+    end
 
-  # Public: Parses a Markdown string into a `document` node.
-  #
-  # string - {String} to be parsed
-  # option - A {Symbol} or {Array of Symbol}s indicating the parse options
-  # extensions - An {Array of Symbol}s indicating the extensions to use
-  #
-  # Returns the `document` node.
-  def self.render_doc(text, options = :DEFAULT, extensions = [])
-    raise TypeError, "text must be a String; got a #{text.class}!" unless text.is_a?(String)
+    # Public: Parses a Markdown string into a `document` node.
+    #
+    # string - {String} to be parsed
+    # option - A {Symbol} or {Array of Symbol}s indicating the parse options
+    # extensions - An {Array of Symbol}s indicating the extensions to use
+    #
+    # Returns the `document` node.
+    def render_doc(text, options = :DEFAULT, extensions = [])
+      raise TypeError, "text must be a String; got a #{text.class}!" unless text.is_a?(String)
 
-    opts = Config.process_options(options, :parse)
-    text = text.encode("UTF-8")
-    Node.parse_document(text, text.bytesize, opts, extensions)
-  end
+      opts = Config.process_options(options, :parse)
+      text = text.encode("UTF-8")
+      Node.parse_document(text, text.bytesize, opts, extensions)
+    end
+end
 end
diff --git a/lib/commonmarker/config.rb b/lib/commonmarker/config.rb
index 59f02790..db09d8ac 100644
--- a/lib/commonmarker/config.rb
+++ b/lib/commonmarker/config.rb
@@ -33,20 +33,22 @@ module Config
       format: [:html, :xml, :commonmark, :plaintext].freeze,
     }.freeze
 
-    def self.process_options(option, type)
-      case option
-      when Symbol
-        OPTS.fetch(type).fetch(option)
-      when Array
-        raise TypeError if option.none?
+    class << self
+      def process_options(option, type)
+        case option
+        when Symbol
+          OPTS.fetch(type).fetch(option)
+        when Array
+          raise TypeError if option.none?
 
-        # neckbearding around. the map will both check the opts and then bitwise-OR it
-        OPTS.fetch(type).fetch_values(*option).inject(0, :|)
-      else
-        raise TypeError, "option type must be a valid symbol or array of symbols within the #{name}::OPTS[:#{type}] context"
+          # neckbearding around. the map will both check the opts and then bitwise-OR it
+          OPTS.fetch(type).fetch_values(*option).inject(0, :|)
+        else
+          raise TypeError, "option type must be a valid symbol or array of symbols within the #{name}::OPTS[:#{type}] context"
+        end
+      rescue KeyError => e
+        raise TypeError, "option ':#{e.key}' does not exist for #{name}::OPTS[:#{type}]"
       end
-    rescue KeyError => e
-      raise TypeError, "option ':#{e.key}' does not exist for #{name}::OPTS[:#{type}]"
-    end
+  end
   end
 end
diff --git a/lib/commonmarker/renderer.rb b/lib/commonmarker/renderer.rb
index 3be353e6..049e4c7f 100644
--- a/lib/commonmarker/renderer.rb
+++ b/lib/commonmarker/renderer.rb
@@ -113,7 +113,7 @@ def tagfilter(str)
             )
             (?=\s|>|/>)
           }xi,
-          '&lt;\1'
+          '&lt;\1',
         )
       else
         str
diff --git a/test/test_basics.rb b/test/test_basics.rb
index 70bbe76b..d6958a2c 100644
--- a/test/test_basics.rb
+++ b/test/test_basics.rb
@@ -13,6 +13,7 @@ def test_to_html
 
   def test_markdown_to_html
     html = CommonMarker.render_html("Hi *there*")
+
     assert_equal("<p>Hi <em>there</em></p>\n", html)
   end
 
diff --git a/test/test_commands.rb b/test/test_commands.rb
index f26fe89f..9dc31ff2 100644
--- a/test/test_commands.rb
+++ b/test/test_commands.rb
@@ -5,11 +5,13 @@
 class TestCommands < Minitest::Test
   def test_basic
     out = make_bin("strong.md")
+
     assert_equal("<p>I am <strong>strong</strong></p>", out)
   end
 
   def test_does_not_have_extensions
     out = make_bin("table.md")
+
     assert_includes(out, "| a")
     refute_includes(out, "<p><del>hi</del>")
     refute_includes(out, "<table> <tr> <th> a </th> <td> c </td>")
@@ -17,6 +19,7 @@ def test_does_not_have_extensions
 
   def test_understands_extensions
     out = make_bin("table.md", "--extension=table")
+
     refute_includes(out, "| a")
     refute_includes(out, "<p><del>hi</del>")
     ["<table>", "<tr>", "<th>", "a", "</th>", "<td>", "c", "</td>"].each { |html| assert_includes(out, html) }
@@ -24,6 +27,7 @@ def test_understands_extensions
 
   def test_understands_multiple_extensions
     out = make_bin("table.md", "--extension=table,strikethrough")
+
     refute_includes(out, "| a")
     assert_includes(out, "<p><del>hi</del>")
     ["<table>", "<tr>", "<th>", "a", "</th>", "<td>", "c", "</td>"].each { |html| assert_includes(out, html) }
@@ -31,6 +35,7 @@ def test_understands_multiple_extensions
 
   def test_understands_html_format_with_renderer_and_extensions
     out = make_bin("table.md", "--to=html --extension=table,strikethrough --html-renderer")
+
     refute_includes(out, "| a")
     assert_includes(out, "<p><del>hi</del>")
     ["<table>", "<tr>", "<th>", "a", "</th>", "<td>", "c", "</td>"].each { |html| assert_includes(out, html) }
@@ -38,17 +43,20 @@ def test_understands_html_format_with_renderer_and_extensions
 
   def test_understands_xml_format
     out = make_bin("strong.md", "--to=xml")
+
     assert_includes(out, '<?xml version="1.0" encoding="UTF-8"?>')
     assert_includes(out, '<text xml:space="preserve">strong</text>')
   end
 
   def test_understands_commonmark_format
     out = make_bin("strong.md", "--to=commonmark")
+
     assert_equal("I am **strong**", out)
   end
 
   def test_understands_plaintext_format
     out = make_bin("strong.md", "--to=plaintext")
+
     assert_equal("I am strong", out)
   end
 
diff --git a/test/test_commonmark.rb b/test/test_commonmark.rb
index 0c8d00ca..e4861359 100644
--- a/test/test_commonmark.rb
+++ b/test/test_commonmark.rb
@@ -31,7 +31,7 @@ def test_to_commonmark
 
     assert_equal(\
       render_doc(@markdown).to_html.squeeze(" ").gsub(HTML_COMMENT, ""),
-      render_doc(compare).to_html.squeeze(" ").gsub(HTML_COMMENT, "")
+      render_doc(compare).to_html.squeeze(" ").gsub(HTML_COMMENT, ""),
     )
   end
 end
diff --git a/test/test_doc.rb b/test/test_doc.rb
index 9b77a638..c77cb980 100644
--- a/test/test_doc.rb
+++ b/test/test_doc.rb
@@ -34,24 +34,28 @@ def test_get_next
 
   def test_insert_before
     paragraph = Node.new(:paragraph)
+
     assert(@first_child.insert_before(paragraph))
     assert_match("<p></p>\n<p>Hi <em>there</em>.", @doc.to_html)
   end
 
   def test_insert_after
     paragraph = Node.new(:paragraph)
+
     assert(@first_child.insert_after(paragraph))
     assert_match("<strong>many nodes</strong>!</p>\n<p></p>\n", @doc.to_html)
   end
 
   def test_prepend_child
     code = Node.new(:code)
+
     assert(@first_child.prepend_child(code))
     assert_match("<p><code></code>Hi <em>there</em>.", @doc.to_html)
   end
 
   def test_append_child
     strong = Node.new(:strong)
+
     assert(@first_child.append_child(strong))
     assert_match("!<strong></strong></p>\n", @doc.to_html)
   end
diff --git a/test/test_encoding.rb b/test/test_encoding.rb
index 35d5c33c..50e08fa9 100644
--- a/test/test_encoding.rb
+++ b/test/test_encoding.rb
@@ -8,15 +8,18 @@ def test_encoding
     contents = fixtures_file("curly.md")
     doc = CommonMarker.render_doc(contents, :SMART)
     render = doc.to_html
+
     assert_equal("<p>This curly quote “makes commonmarker throw an exception”.</p>", render.rstrip)
 
     render = doc.to_xml
+
     assert_includes(render, '<text xml:space="preserve">This curly quote “makes commonmarker throw an exception”.</text>')
   end
 
   def test_string_content_is_utf8
     doc = CommonMarker.render_doc("Hi *there*")
     text = doc.first_child.last_child.first_child
+
     assert_equal("there", text.string_content)
     assert_equal("UTF-8", text.string_content.encoding.name)
   end
diff --git a/test/test_extensions.rb b/test/test_extensions.rb
index ced40e34..4faf69d7 100644
--- a/test/test_extensions.rb
+++ b/test/test_extensions.rb
@@ -17,6 +17,7 @@ def test_uses_specified_extensions
     CommonMarker.render_html(@markdown, :DEFAULT, [:table]).tap do |out|
       refute_includes(out, "| a")
       ["<table>", "<tr>", "<th>", "a", "</th>", "<td>", "c", "</td>", "<strong>x</strong>"].each { |html| assert_includes(out, html) }
+
       assert_includes(out, "~~hi~~")
     end
 
@@ -27,9 +28,11 @@ def test_uses_specified_extensions
     end
 
     doc = CommonMarker.render_doc("~a~ ~~b~~ ~~~c~~~", :STRIKETHROUGH_DOUBLE_TILDE, [:strikethrough])
+
     assert_equal("<p>~a~ <del>b</del> ~~~c~~~</p>\n", doc.to_html)
 
     html = CommonMarker.render_html("~a~ ~~b~~ ~~~c~~~", :STRIKETHROUGH_DOUBLE_TILDE, [:strikethrough])
+
     assert_equal("<p>~a~ <del>b</del> ~~~c~~~</p>\n", html)
 
     CommonMarker.render_html(@markdown, :DEFAULT, [:table, :strikethrough]).tap do |out|
@@ -45,16 +48,19 @@ def test_extensions_with_renderers
     doc.to_html.tap do |out|
       refute_includes(out, "| a")
       ["<table>", "<tr>", "<th>", "a", "</th>", "<td>", "c", "</td>", "<strong>x</strong>"].each { |html| assert_includes(out, html) }
+
       assert_includes(out, "~~hi~~")
     end
 
     HtmlRenderer.new.render(doc).tap do |out|
       refute_includes(out, "| a")
       ["<table>", "<tr>", "<th>", "a", "</th>", "<td>", "c", "</td>", "<strong>x</strong>"].each { |html| assert_includes(out, html) }
+
       assert_includes(out, "~~hi~~")
     end
 
     doc = CommonMarker.render_doc("~a~ ~~b~~ ~~~c~~~", :STRIKETHROUGH_DOUBLE_TILDE, [:strikethrough])
+
     assert_equal("<p>~a~ <del>b</del> ~~~c~~~</p>\n", HtmlRenderer.new.render(doc))
   end
 
diff --git a/test/test_gc.rb b/test/test_gc.rb
index 05456e45..24e78279 100644
--- a/test/test_gc.rb
+++ b/test/test_gc.rb
@@ -24,6 +24,7 @@ def test_drop_child_reference
     GC.start
     # Test that the cached child object is still valid.
     text = doc.first_child.last_child.first_child
+
     assert_equal("there", text.string_content)
   end
 
diff --git a/test/test_linebreaks.rb b/test/test_linebreaks.rb
index f81b049c..1fa885e5 100644
--- a/test/test_linebreaks.rb
+++ b/test/test_linebreaks.rb
@@ -5,11 +5,13 @@
 class TestLinebreaks < Minitest::Test
   def test_hardbreak_no_spaces
     doc = CommonMarker.render_doc("foo\nbaz")
+
     assert_equal("<p>foo<br />\nbaz</p>\n", doc.to_html(:HARDBREAKS))
   end
 
   def test_hardbreak_with_spaces
     doc = CommonMarker.render_doc("foo  \nbaz")
+
     assert_equal("<p>foo<br />\nbaz</p>\n", doc.to_html(:HARDBREAKS))
   end
 end
diff --git a/test/test_maliciousness.rb b/test/test_maliciousness.rb
index 454cf50f..dac58fb6 100644
--- a/test/test_maliciousness.rb
+++ b/test/test_maliciousness.rb
@@ -74,6 +74,7 @@ def test_rendering_with_bad_type
       err = assert_raises(TypeError) do
         CommonMarker.render_doc("foo \n baz", :safe)
       end
+
       assert_equal("option ':safe' does not exist for CommonMarker::Config::OPTS[:parse]", err.message)
 
       assert_raises(TypeError) do
diff --git a/test/test_node.rb b/test/test_node.rb
index b21c4269..48f29994 100644
--- a/test/test_node.rb
+++ b/test/test_node.rb
@@ -12,6 +12,7 @@ def test_walk
     @doc.walk do |node|
       nodes << node.type
     end
+
     assert_equal([:document, :paragraph, :text, :emph, :text, :text], nodes)
   end
 
@@ -20,6 +21,7 @@ def test_each
     @doc.first_child.each do |node|
       nodes << node.type
     end
+
     assert_equal([:text, :emph, :text], nodes)
   end
 
@@ -30,18 +32,21 @@ def test_deprecated_each_child
         nodes << node.type
       end
     end
+
     assert_equal([:text, :emph, :text], nodes)
     assert_match(/`each_child` is deprecated/, err)
   end
 
   def test_select
     nodes = @doc.first_child.select { |node| node.type == :text }
+
     assert_equal(CommonMarker::Node, nodes.first.class)
     assert_equal([:text, :text], nodes.map(&:type))
   end
 
   def test_map
     nodes = @doc.first_child.map(&:type)
+
     assert_equal([:text, :emph, :text], nodes)
   end
 
@@ -58,6 +63,7 @@ def test_to_html
   def test_html_renderer
     renderer = HtmlRenderer.new
     result = renderer.render(@doc)
+
     assert_equal("<p>Hi <em>there</em>, I am mostly text!</p>\n", result)
   end
 
@@ -66,6 +72,7 @@ def test_walk_and_set_string_content
       node.string_content = "world" if node.type == :text && node.string_content == "there"
     end
     result = HtmlRenderer.new.render(@doc)
+
     assert_equal("<p>Hi <em>world</em>, I am mostly text!</p>\n", result)
   end
 
@@ -76,6 +83,7 @@ def test_walk_and_delete_node
         node.delete
       end
     end
+
     assert_equal("<p>Hi there, I am mostly text!</p>\n", @doc.to_html)
   end
 
diff --git a/test/test_pathological_inputs.rb b/test/test_pathological_inputs.rb
index eb8fca3e..427fc64d 100644
--- a/test/test_pathological_inputs.rb
+++ b/test/test_pathological_inputs.rb
@@ -47,6 +47,7 @@ def markdown(str)
 pathological.each_pair do |name, description|
   define_method("test_#{name}") do
     input, = description
+
     assert markdown(input)
   end
 end
diff --git a/test/test_renderer.rb b/test/test_renderer.rb
index d3209a29..a13ca975 100644
--- a/test/test_renderer.rb
+++ b/test/test_renderer.rb
@@ -10,6 +10,7 @@ def setup
   def test_html_renderer
     renderer = HtmlRenderer.new
     result = renderer.render(@doc)
+
     assert_equal("<p>Hi <em>there</em></p>\n", result)
   end
 
@@ -25,6 +26,7 @@ def test_multiple_tables
     DOC
     doc = CommonMarker.render_doc(content, :DEFAULT, [:autolink, :table, :tagfilter])
     results = CommonMarker::HtmlRenderer.new.render(doc)
+
     assert_equal(2, results.scan(/<tbody>/).size)
   end
 
@@ -41,6 +43,7 @@ def text(node)
     end
 
     renderer = my_renderer.new
+
     assert_equal(Encoding::UTF_8, renderer.render(@doc).encoding)
     assert_equal(renderer.input_encoding, renderer.output_encoding)
   end
diff --git a/test/test_smartpunct.rb b/test/test_smartpunct.rb
index c2e308ee..f9ee8568 100644
--- a/test/test_smartpunct.rb
+++ b/test/test_smartpunct.rb
@@ -22,6 +22,7 @@ def test_smart_hardbreak_no_spaces_render_doc
     markdown = "\"foo\"\nbaz"
     result = "<p>“foo”<br />\nbaz</p>\n"
     doc = CommonMarker.render_doc(markdown, :SMART)
+
     assert_equal(result, doc.to_html([:HARDBREAKS]))
   end
 end
diff --git a/test/test_spec.rb b/test/test_spec.rb
index 9ef865aa..a7c059a6 100644
--- a/test/test_spec.rb
+++ b/test/test_spec.rb
@@ -13,17 +13,20 @@ class TestSpec < Minitest::Test
 
     define_method("test_to_html_example_#{testcase[:example]}") do
       actual = doc.to_html(:UNSAFE, testcase[:extensions]).rstrip
+
       assert_equal testcase[:html], actual, testcase[:markdown]
     end
 
     define_method("test_html_renderer_example_#{testcase[:example]}") do
       actual = HtmlRenderer.new(options: :UNSAFE, extensions: testcase[:extensions]).render(doc).rstrip
+
       assert_equal testcase[:html], actual, testcase[:markdown]
     end
 
     define_method("test_sourcepos_example_#{testcase[:example]}") do
       lhs = doc.to_html([:UNSAFE, :SOURCEPOS], testcase[:extensions]).rstrip
       rhs = HtmlRenderer.new(options: [:UNSAFE, :SOURCEPOS], extensions: testcase[:extensions]).render(doc).rstrip
+
       assert_equal lhs, rhs, testcase[:markdown]
     end
   end
diff --git a/test/test_tasklists.rb b/test/test_tasklists.rb
index a135376a..b59db5bc 100644
--- a/test/test_tasklists.rb
+++ b/test/test_tasklists.rb
@@ -27,6 +27,7 @@ def test_html_renderer
 
   def test_tasklist_state
     list = @doc.first_child
+
     assert_equal("checked", list.first_child.tasklist_state)
     assert_predicate(list.first_child, :tasklist_item_checked?)
     assert_equal("unchecked", list.first_child.next.tasklist_state)
@@ -36,8 +37,10 @@ def test_tasklist_state
   def test_set_tasklist_state
     list = @doc.first_child
     list.first_child.tasklist_item_checked = false
+
     refute_predicate(list.first_child, :tasklist_item_checked?)
     list.first_child.next.tasklist_item_checked = true
+
     assert_predicate(list.first_child.next, :tasklist_item_checked?)
   end
 end