1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/file/extname_spec.rb b/spec/ruby/core/file/extname_spec.rb
new file mode 100644
index 0000000000..fedd4fc89f
--- /dev/null
+++ b/spec/ruby/core/file/extname_spec.rb
@@ -0,0 +1,54 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "File.extname" do
+  it "returns the extension (the portion of file name in path after the period)." do
+    File.extname("foo.rb").should == ".rb"
+    File.extname("/foo/bar.rb").should == ".rb"
+    File.extname("/foo.rb/bar.c").should == ".c"
+    File.extname("bar").should == ""
+    File.extname(".bashrc").should == ""
+    File.extname("/foo.bar/baz").should == ""
+    File.extname(".app.conf").should == ".conf"
+  end
+
+  it "returns the extension (the portion of file name in path after the period).(edge cases)" do
+    File.extname("").should ==  ""
+    File.extname(".").should ==  ""
+    File.extname("/").should ==  ""
+    File.extname("/.").should ==  ""
+    File.extname("..").should ==  ""
+    File.extname("...").should ==  ""
+    File.extname("....").should ==  ""
+    File.extname(".foo.").should ==  ""
+    File.extname("foo.").should ==  ""
+  end
+
+  it "returns only the last extension of a file with several dots" do
+    File.extname("a.b.c.d.e").should == ".e"
+  end
+
+  it "accepts an object that has a #to_path method" do
+    File.extname(mock_to_path("a.b.c.d.e")).should == ".e"
+  end
+
+  it "raises a TypeError if not passed a String type" do
+    lambda { File.extname(nil)   }.should raise_error(TypeError)
+    lambda { File.extname(0)     }.should raise_error(TypeError)
+    lambda { File.extname(true)  }.should raise_error(TypeError)
+    lambda { File.extname(false) }.should raise_error(TypeError)
+  end
+
+  it "raises an ArgumentError if not passed one argument" do
+    lambda { File.extname }.should raise_error(ArgumentError)
+    lambda { File.extname("foo.bar", "foo.baz") }.should raise_error(ArgumentError)
+  end
+
+  with_feature :encoding do
+
+    it "returns the extension for a multibyte filename" do
+      File.extname('Имя.m4a').should == ".m4a"
+    end
+
+  end
+end