diff --git a/activesupport/test/callbacks_test.rb b/activesupport/test/callbacks_test.rb
index f8e2ce22fa..32c2dfdfc0 100644
--- a/activesupport/test/callbacks_test.rb
+++ b/activesupport/test/callbacks_test.rb
@@ -1,27 +1,6 @@
 require 'abstract_unit'
 
 module CallbacksTest
-  class Phone
-    include ActiveSupport::Callbacks
-    define_callbacks :save
-
-    set_callback :save, :before, :before_save1
-    set_callback :save, :after, :after_save1
-
-    def before_save1; self.history << :before; end
-    def after_save1; self.history << :after; end
-
-    def save
-      run_callbacks :save do
-        raise 'boom'
-      end
-    end
-
-    def history
-      @history ||= []
-    end
-  end
-
   class Record
     include ActiveSupport::Callbacks
 
diff --git a/activesupport/test/core_ext/module_test.rb b/activesupport/test/core_ext/module_test.rb
index 283b13ff8b..5b99fae411 100644
--- a/activesupport/test/core_ext/module_test.rb
+++ b/activesupport/test/core_ext/module_test.rb
@@ -12,12 +12,6 @@ class Ab
   Constant3 = "Goodbye World"
 end
 
-module Xy
-  class Bc
-    include One
-  end
-end
-
 module Yz
   module Zy
     class Cd
diff --git a/activesupport/test/fixtures/custom.rb b/activesupport/test/fixtures/custom.rb
deleted file mode 100644
index 0eefce0c25..0000000000
--- a/activesupport/test/fixtures/custom.rb
+++ /dev/null
@@ -1,2 +0,0 @@
-class Custom
-end
\ No newline at end of file
diff --git a/activesupport/test/testing/constant_lookup_test.rb b/activesupport/test/testing/constant_lookup_test.rb
index aca2951450..71a9561189 100644
--- a/activesupport/test/testing/constant_lookup_test.rb
+++ b/activesupport/test/testing/constant_lookup_test.rb
@@ -6,7 +6,6 @@ class Bar < Foo
   def index; end
   def self.index; end
 end
-class Baz < Bar; end
 module FooBar; end
 
 class ConstantLookupTest < ActiveSupport::TestCase