diff --git a/test/html4/test_document.rb b/test/html4/test_document.rb
index 357c4bcc7b4..0372db438ba 100644
--- a/test/html4/test_document.rb
+++ b/test/html4/test_document.rb
@@ -626,7 +626,7 @@ def html.path
 
         # issue #1821, #2110
         def test_parse_can_take_pathnames
-          assert(File.size(HTML_FILE) > 4096) # file must be big enough to trip the read callback more than once
+          assert_operator(File.size(HTML_FILE), :>, 4096) # file must be big enough to trip the read callback more than once
 
           doc = Nokogiri::HTML4.parse(Pathname.new(HTML_FILE))
 
diff --git a/test/test_memory_leak.rb b/test/test_memory_leak.rb
index 14d0889b254..d337645f3ed 100644
--- a/test/test_memory_leak.rb
+++ b/test/test_memory_leak.rb
@@ -84,7 +84,7 @@ def test_for_memory_leak
       end
       2.times { GC.start }
       count_end = count_object_space_documents
-      assert((count_end - count_start) <= 2, "memory leak detected")
+      assert_operator((count_end - count_start), :<=, 2, "memory leak detected")
     rescue LoadError
       puts "\ndike is not installed, skipping memory leak test"
     end
@@ -289,28 +289,28 @@ def test_object_space_memsize_of
         <child>asdf</child>
       </root>
     XML
-    assert(more_children_size > base_size, "adding children should increase memsize")
+    assert_operator(more_children_size, :>, base_size, "adding children should increase memsize")
 
     attributes_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
       <root>
         <child a="b" c="d">asdf</child>
       </root>
     XML
-    assert(attributes_size > base_size, "adding attributes should increase memsize")
+    assert_operator(attributes_size, :>, base_size, "adding attributes should increase memsize")
 
     string_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
       <root>
         <child>asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf</child>
       </root>
     XML
-    assert(string_size > base_size, "longer strings should increase memsize")
+    assert_operator(string_size, :>, base_size, "longer strings should increase memsize")
 
     bigger_name_size = ObjectSpace.memsize_of(Nokogiri::XML(<<~XML))
       <root>
         <superduperamazingchild>asdf</superduperamazingchild>
       </root>
     XML
-    assert(bigger_name_size > base_size, "longer tags should increase memsize")
+    assert_operator(bigger_name_size, :>, base_size, "longer tags should increase memsize")
   end
 
   def test_object_space_memsize_with_dtd
diff --git a/test/xml/sax/test_push_parser.rb b/test/xml/sax/test_push_parser.rb
index 7c6e01e266d..5c9ddd38405 100644
--- a/test/xml/sax/test_push_parser.rb
+++ b/test/xml/sax/test_push_parser.rb
@@ -173,7 +173,7 @@ def error(msg)
       </p>
     XML
     parser.finish
-    assert(parser.document.errors.size >= 1)
+    assert_operator(parser.document.errors.size, :>=, 1)
     assert_equal [["p", []], ["bar", []]], parser.document.start_elements
     assert_equal "FooBar", parser.document.data.map { |x|
       x.gsub(/\s/, "")
@@ -186,7 +186,7 @@ def error(msg)
     # This is ISO_8859-1:
     parser << "<?xml version='1.0' encoding='UTF-8'?><r>Gau\337</r>"
     parser.finish
-    assert(parser.document.errors.size >= 1)
+    assert_operator(parser.document.errors.size, :>=, 1)
     assert_equal "Gau\337", parser.document.data.join
     assert_equal [["r"]], parser.document.end_elements
   end
diff --git a/test/xml/test_document.rb b/test/xml/test_document.rb
index e39dbab26c7..ad8575704df 100644
--- a/test/xml/test_document.rb
+++ b/test/xml/test_document.rb
@@ -685,7 +685,7 @@ def xml.path
 
         # issue #1821, #2110
         def test_parse_can_take_pathnames
-          assert(File.size(XML_ATOM_FILE) > 4096) # file must be big enough to trip the read callback more than once
+          assert_operator(File.size(XML_ATOM_FILE), :>, 4096) # file must be big enough to trip the read callback more than once
 
           doc = Nokogiri::XML.parse(Pathname.new(XML_ATOM_FILE))
 
diff --git a/test/xml/test_node.rb b/test/xml/test_node.rb
index 5946c7a31f4..cc483062284 100644
--- a/test/xml/test_node.rb
+++ b/test/xml/test_node.rb
@@ -143,7 +143,7 @@ def test_node_context_parsing_of_malformed_xml_fragment_uses_the_right_class_to_
         def test_parse_error_list
           error_count = xml.errors.length
           xml.root.parse("<hello>")
-          assert(error_count < xml.errors.length, "errors should have increased")
+          assert_operator(error_count, :<, xml.errors.length, "errors should have increased")
         end
 
         def test_parse_error_on_fragment_with_empty_document
diff --git a/test/xml/test_node_set.rb b/test/xml/test_node_set.rb
index 158a92f61f9..0f76bcefdfd 100644
--- a/test/xml/test_node_set.rb
+++ b/test/xml/test_node_set.rb
@@ -284,22 +284,22 @@ def awesome(ns)
             assert(node_set_one = xml.xpath("//employee"))
             assert(node_set_two = xml.xpath("//employee"))
 
-            refute_equal(node_set_one.object_id, node_set_two.object_id)
+            refute_operator(node_set_one.object_id, :==, node_set_two.object_id)
             refute_same(node_set_one, node_set_two)
 
-            assert_equal(node_set_one, node_set_two)
+            assert_operator(node_set_one, :==, node_set_two)
           end
 
           it "handles comparison to a string" do
             node_set_one = xml.xpath("//employee")
-            refute(node_set_one == "asdfadsf")
+            refute_operator(node_set_one, :==, "asdfadsf")
           end
 
           it "returns false if same elements are out of order" do
             one = xml.xpath("//employee")
             two = xml.xpath("//employee")
             two.push(two.shift)
-            refute_equal(one, two)
+            refute_operator(one, :==, two)
           end
 
           it "returns false if one is a subset of the other" do
@@ -307,8 +307,8 @@ def awesome(ns)
             node_set_two = xml.xpath("//employee")
             node_set_two.delete(node_set_two.first)
 
-            refute(node_set_one == node_set_two)
-            refute(node_set_two == node_set_one)
+            refute_operator(node_set_one, :==, node_set_two)
+            refute_operator(node_set_two, :==, node_set_one)
           end
         end