diff --git a/test/fileutils/test_fileutils.rb b/test/fileutils/test_fileutils.rb
index 27511c2..cb7c5cf 100644
--- a/test/fileutils/test_fileutils.rb
+++ b/test/fileutils/test_fileutils.rb
@@ -1229,7 +1229,7 @@ def test_mkdir_p
     )
     my_rm_rf 'tmpdir'
     dirs.each do |d|
-      mkdir_p d
+      assert_equal([d], mkdir_p(d))
       assert_directory d
       assert_file_not_exist "#{d}/a"
       assert_file_not_exist "#{d}/b"
@@ -1981,10 +1981,12 @@ def test_link
 
   def test_makedirs
     check_singleton :makedirs
+    assert_equal(FileUtils.method(:mkdir_p), FileUtils.method(:makedirs))
   end
 
   def test_mkpath
     check_singleton :mkpath
+    assert_equal(FileUtils.method(:mkdir_p), FileUtils.method(:mkpath))
   end
 
   def test_move