Fixed File.extname at a name ending with a dot

File.extname now returns a dot string at a name ending with a dot.
[Bug #15267]

2 files changed, 12 insertions, 6 deletions

diff --git a/test/ruby/test_file_exhaustive.rb b/test/ruby/test_file_exhaustive.rb
index 6b80b82389..4bb5479303 100644
--- a/test/ruby/test_file_exhaustive.rb
+++ b/test/ruby/test_file_exhaustive.rb
@@ -1308,21 +1308,23 @@ class TestFileExhaustive < Test::Unit::TestCase
     assert_equal(".test", File.extname(regular_file))
     assert_equal(".test", File.extname(utf8_file))
     prefixes = ["", "/", ".", "/.", "bar/.", "/bar/."]
-    infixes = ["", " ", "."]
+    infixes = ["", " "]
     infixes2 = infixes + [".ext "]
     appendixes = [""]
     if NTFS
       appendixes << " " << "." << "::$DATA" << "::$DATA.bar"
+    else
+      appendixes << [".", "."]
     end
     prefixes.each do |prefix|
-      appendixes.each do |appendix|
+      appendixes.each do |appendix, ext = ""|
         infixes.each do |infix|
           path = "#{prefix}foo#{infix}#{appendix}"
-          assert_equal("", File.extname(path), "File.extname(#{path.inspect})")
+          assert_equal(ext, File.extname(path), "File.extname(#{path.inspect})")
         end
         infixes2.each do |infix|
           path = "#{prefix}foo#{infix}.ext#{appendix}"
-          assert_equal(".ext", File.extname(path), "File.extname(#{path.inspect})")
+          assert_equal(ext.empty? ? ".ext" : appendix, File.extname(path), "File.extname(#{path.inspect})")
         end
       end
     end
diff --git a/test/ruby/test_path.rb b/test/ruby/test_path.rb
index 6af4fb6ac0..b35e942a2a 100644
--- a/test/ruby/test_path.rb
+++ b/test/ruby/test_path.rb
@@ -236,10 +236,14 @@ class TestPath < Test::Unit::TestCase
     assert_equal(ext, File.extname('.a/b/d/test.rb'))
     unless /mswin|bccwin|mingw/ =~ RUBY_PLATFORM
       # trailing spaces and dots are ignored on NTFS.
-      ext = ''
+      ext = '.'
     end
     assert_equal(ext, File.extname('a.rb.'))
-    assert_equal('', File.extname('a.'))
+    if /mswin|bccwin|mingw/ =~ RUBY_PLATFORM
+      # trailing spaces and dots are ignored on NTFS.
+      ext = ''
+    end
+    assert_equal(ext, File.extname('a.'))
     assert_equal('', File.extname('.x'))
     assert_equal('', File.extname('..x'))
   end