1 files changed, 43 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..2bc598c0af
--- /dev/null
+++ b/spec/ruby/library/etc/getlogin_spec.rb
@@ -0,0 +1,43 @@
+require_relative '../../spec_helper'
+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
+        if ENV['TRAVIS'] and platform_is(:darwin)
+          # See https://travis-ci.org/ruby/spec/jobs/285967744
+          # and https://travis-ci.org/ruby/spec/jobs/285999602
+          Etc.getlogin.should.instance_of?(String)
+        else
+          # Etc.getlogin returns the same result of logname(2)
+          # if it returns non NULL
+          if system("which logname", out: File::NULL, err: File::NULL)
+            Etc.getlogin.should == `logname`.chomp
+          else
+            # fallback to `id` command since `logname` is not available
+            Etc.getlogin.should == `id -un`.chomp
+          end
+        end
+      else
+        # Etc.getlogin may return nil if the login name is not set
+        # because of chroot or sudo or something.
+        Etc.getlogin.should == 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