1 files changed, 7 insertions, 0 deletions
diff --git a/spec/ruby/core/env/shared/include.rb b/spec/ruby/core/env/shared/include.rb
index 3efcd523d6..70aa555301 100644
--- a/spec/ruby/core/env/shared/include.rb
+++ b/spec/ruby/core/env/shared/include.rb
@@ -17,6 +17,13 @@ describe :env_include, shared: true do
     ENV.send(@method, "foo").should == false
   end
 
+  it "coerces the key with #to_str" do
+    ENV["foo"] = "bar"
+    k = mock('key')
+    k.should_receive(:to_str).and_return("foo")
+    ENV.send(@method, k).should == true
+  end
+
   it "raises TypeError if the argument is not a String and does not respond to #to_str" do
     -> { ENV.send(@method, Object.new) }.should raise_error(TypeError, "no implicit conversion of Object into String")
   end