Revert "Should return "." for File.extname("file.") also on Windows"

We want to introduce consistency and better compatibility with unixen,
but the Windows APIs doues not have consistency fundamentally and
we can not found any logical way...

This reverts commit 61aff0cd189e67fa6f2565639ad0128fa33b88fc.

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/ruby/core/file/extname_spec.rb b/spec/ruby/core/file/extname_spec.rb
index 79290960fb..e9b53bc24d 100644
--- a/spec/ruby/core/file/extname_spec.rb
+++ b/spec/ruby/core/file/extname_spec.rb
@@ -23,14 +23,14 @@ describe "File.extname" do
   end
 
   describe "for a filename ending with a dot" do
-    ruby_version_is ""..."2.7" do
+    guard -> { platform_is :windows or ruby_version_is ""..."2.7" } do
       it "returns ''" do
         File.extname(".foo.").should == ""
         File.extname("foo.").should == ""
       end
     end
 
-    ruby_version_is "2.7" do
+    guard -> { platform_is_not :windows and ruby_version_is "2.7" } do
       it "returns '.'" do
         File.extname(".foo.").should == "."
         File.extname("foo.").should == "."