1 files changed, 9 insertions, 1 deletions
diff --git a/spec/ruby/core/env/delete_spec.rb b/spec/ruby/core/env/delete_spec.rb
index 3d69e4b022..db6d07b057 100644
--- a/spec/ruby/core/env/delete_spec.rb
+++ b/spec/ruby/core/env/delete_spec.rb
@@ -41,7 +41,15 @@ describe "ENV.delete" do
     ENV["foo"].should == nil
   end
 
+  it "removes the variable coerced with #to_str" do
+    ENV["foo"] = "bar"
+    k = mock('key')
+    k.should_receive(:to_str).and_return("foo")
+    ENV.delete(k)
+    ENV["foo"].should == nil
+  end
+
   it "raises TypeError if the argument is not a String and does not respond to #to_str" do
-    -> { ENV.delete(Object.new) }.should raise_error(TypeError, "no implicit conversion of Object into String")
+    -> { ENV.delete(Object.new) }.should.raise(TypeError, "no implicit conversion of Object into String")
   end
 end