1 files changed, 6 insertions, 4 deletions
diff --git a/spec/ruby/core/env/each_key_spec.rb b/spec/ruby/core/env/each_key_spec.rb
index 294bf39912..ad2cb560a0 100644
--- a/spec/ruby/core/env/each_key_spec.rb
+++ b/spec/ruby/core/env/each_key_spec.rb
@@ -10,16 +10,18 @@ describe "ENV.each_key" do
       ENV.clear
       ENV["1"] = "3"
       ENV["2"] = "4"
-      ENV.each_key { |k| e << k }
-      e.should include("1")
-      e.should include("2")
+      ENV.each_key { |k| e << k }.should.equal?(ENV)
+      e.should.include?("1")
+      e.should.include?("2")
     ensure
       ENV.replace orig
     end
   end
 
   it "returns an Enumerator if called without a block" do
-    ENV.each_key.should be_an_instance_of(Enumerator)
+    enum = ENV.each_key
+    enum.should.instance_of?(Enumerator)
+    enum.to_a.should == ENV.keys
   end
 
   it "returns keys in the locale encoding" do