1 files changed, 32 insertions, 0 deletions
diff --git a/spec/ruby/library/etc/getlogin_spec.rb b/spec/ruby/library/etc/getlogin_spec.rb
new file mode 100644
index 0000000000..ae52942a92
--- /dev/null
+++ b/spec/ruby/library/etc/getlogin_spec.rb
@@ -0,0 +1,32 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'etc'
+
+describe "Etc.getlogin" do
+  it "returns the name associated with the current login activity" do
+    getlogin_null = false
+
+    # POSIX logname(1) shows getlogin(2)'s result
+    # NOTE: Etc.getlogin returns ENV['USER'] if getlogin(2) returns NULL
+    begin
+      # make Etc.getlogin to return nil if getlogin(3) returns NULL
+      envuser, ENV['USER'] = ENV['USER'], nil
+      if Etc.getlogin
+        # Etc.getlogin returns the same result of logname(2)
+        # if it returns non NULL
+        Etc.getlogin.should == `id -un`.chomp
+      else
+        # Etc.getlogin may return nil if the login name is not set
+        # because of chroot or sudo or something.
+        Etc.getlogin.should be_nil
+        getlogin_null = true
+      end
+    ensure
+      ENV['USER'] = envuser
+    end
+
+    # if getlogin(2) returns NULL, Etc.getlogin returns ENV['USER']
+    if getlogin_null
+      Etc.getlogin.should == ENV['USER']
+    end
+  end
+end