test_etc.rb: fix for non unique GID

* test/etc/test_etc.rb (TestEtc#test_getgrgid): fix for non unique GID.
  No unixen systems guarantee that GID is unique. Etc.getgrgid would
  not return the first entry in the order of Etc.group for shared GID.
  [ruby-core:47312] [Bug #6935]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36833 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 6 deletions

diff --git a/test/etc/test_etc.rb b/test/etc/test_etc.rb
index 5bc8db431c..c105122af1 100644
--- a/test/etc/test_etc.rb
+++ b/test/etc/test_etc.rb
@@ -76,13 +76,18 @@ class TestEtc < Test::Unit::TestCase
   end
 
   def test_getgrgid
-    groups = {}
-    Etc.group do |s|
-      groups[s.gid] ||= s
+    # group database is not unique on GID, and which entry will be
+    # returned by getgrgid() is not specified.
+    groups = Hash.new {[]}
+    # on MacOSX, same entries are returned from /etc/group and Open
+    # Directory.
+    Etc.group {|s| groups[s.gid] |= [s]}
+    groups.each_pair do |gid, s|
+      assert_include(s, Etc.getgrgid(gid))
     end
-    groups.each_value do |s|
-      assert_equal(s, Etc.getgrgid(s.gid))
-      assert_equal(s, Etc.getgrgid) if Process.egid == s.gid
+    s = groups[Process.egid]
+    unless s.empty?
+      assert_include(s, Etc.getgrgid)
     end
   end