1 files changed, 17 insertions, 1 deletions
diff --git a/mrbgems/mruby-io/test/file.rb b/mrbgems/mruby-io/test/file.rb
index e5c127746..dc6fe369a 100644
--- a/mrbgems/mruby-io/test/file.rb
+++ b/mrbgems/mruby-io/test/file.rb
@@ -54,7 +54,7 @@ assert('File.extname') do
   assert_equal '', File.extname('.foo')
 end
 
-assert('IO#flock') do
+assert('File#flock') do
   f = File.open $mrbtest_io_rfname
   begin
     assert_equal(f.flock(File::LOCK_SH), 0)
@@ -68,6 +68,22 @@ assert('IO#flock') do
   end
 end
 
+assert('File#mtime') do
+  unless Object.const_defined?(:Time)
+    skip "File#mtime require Time"
+  end
+  begin
+    now = Time.now.to_i
+    mt = 0
+    File.open('mtime-test', 'w') do |f|
+      mt = f.mtime.to_i
+    end
+    assert_equal true, mt >= now
+  ensure
+    File.delete('mtime-test')
+  end
+end
+
 assert('File.join') do
   assert_equal "", File.join()
   assert_equal "a", File.join("a")