1 files changed, 12 insertions, 9 deletions
diff --git a/spec/ruby/core/process/groups_spec.rb b/spec/ruby/core/process/groups_spec.rb
index 2e12aa350c..fa916671a4 100644
--- a/spec/ruby/core/process/groups_spec.rb
+++ b/spec/ruby/core/process/groups_spec.rb
@@ -1,20 +1,24 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "Process.groups" do
   platform_is_not :windows do
     it "gets an Array of the gids of groups in the supplemental group access list" do
       groups = `id -G`.scan(/\d+/).map { |i| i.to_i }
+      # Include the standard `id` command output.  On macOS, GNU
+      # coreutils `id` is limited to NGROUPS_MAX groups, because of
+      # the backward compatibility of getgroups(2).
+      (groups |= `/usr/bin/id -G`.scan(/\d+/).map { |i| i.to_i }) rescue nil
       gid = Process.gid
 
-      expected = (groups.sort - [gid]).sort
-      actual = (Process.groups - [gid]).sort
+      expected = (groups.sort - [gid]).uniq.sort
+      actual = (Process.groups - [gid]).uniq.sort
       actual.should == expected
     end
   end
 end
 
 describe "Process.groups=" do
-  platform_is_not :windows do
+  platform_is_not :windows, :android do
     as_superuser do
       it "sets the list of gids of groups in the supplemental group access list" do
         groups = Process.groups
@@ -46,17 +50,16 @@ describe "Process.groups=" do
           Process.groups.should == [ Process.gid ]
           supplementary = groups - [ Process.gid ]
           if supplementary.length > 0
-            lambda { Process.groups = supplementary }.should raise_error(Errno::EPERM)
+            -> { Process.groups = supplementary }.should.raise(Errno::EPERM)
           end
         end
       end
 
       platform_is_not :aix do
         it "raises Errno::EPERM" do
-          groups = Process.groups
-          lambda {
-            Process.groups = groups
-          }.should raise_error(Errno::EPERM)
+          -> {
+            Process.groups = [0]
+          }.should.raise(Errno::EPERM)
         end
       end
     end