Array#permutation: Test that the enum doesn't cache anything about th…

…e array.
jimweirich · Dec 31, 2009 · eedf133 · eedf133
1 parent d485b7e
commit eedf133
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/core/array/permutation_spec.rb b/core/array/permutation_spec.rb
@@ -87,6 +87,14 @@
       @numbers.permutation(3.7).to_a.sort.should == 
         @numbers.permutation(3).to_a.sort
     end  
-
+
+    it "returns an Enumerator which works as expected even when the array was modified" do
+      @numbers = [1, 2]
+      enum = @numbers.permutation
+      @numbers << 3
+      enum.to_a.sort.should == [
+        [1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]
+      ].sort
+    end
   end
 end