added test for #891: incorrect inversion of chained comparisons; fixed a

faulty test case in test/test_switch.coffee

test/test_operations.coffee

@@ -173,3 +173,6 @@ ok a is '123456'
 
 # Multiple operators should space themselves.
 ok + +1 is - -1
+
+#891: incorrect inversion of chained comparisons
+ok (true unless 0 > 1 > 2)

test/test_switch.coffee

@@ -59,7 +59,7 @@ result = switch
   when '' not of {''}           then 2
   when [] not instanceof Array  then 3
   when true is false            then 4
-  when 'x' < 'y' > 'z'          then 5
+  when 'x' > 'y' > 'z'          then 5
   when 'a' in ['b', 'c']        then 6
   when 'd' in (['e', 'f'])      then 7
   else ok