1 files changed, 18 insertions, 0 deletions
diff --git a/spec/ruby/core/array/drop_spec.rb b/spec/ruby/core/array/drop_spec.rb
index 89b8534af4..84ea86b04c 100644
--- a/spec/ruby/core/array/drop_spec.rb
+++ b/spec/ruby/core/array/drop_spec.rb
@@ -30,4 +30,22 @@ describe "Array#drop" do
     ary.shift
     ary.drop(1).should == [2]
   end
+
+  it "tries to convert the passed argument to an Integer using #to_int" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return(2)
+
+    [1, 2, 3].drop(obj).should == [3]
+  end
+
+  it "raises a TypeError when the passed argument can't be coerced to Integer" do
+    -> { [1, 2].drop("cat") }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the passed argument isn't an integer and #to_int returns non-Integer" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return("cat")
+
+    -> { [1, 2].drop(obj) }.should raise_error(TypeError)
+  end
 end