third_party/WebKit/LayoutTests/fast/js/exception-thrown-from-equal.html

   1 <p>This page tests whether primitive conversions during equality tests properly
   2 throw exceptions. If the test passes, you'll see a series of PASS messages below.
   3 </p>
   4 <hr>
   5 <pre id="console"></pre>
   6
   7 <script>
   8 function log(s)
   9 {
  10     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
  11 }
  12
  13 function shouldThrow(expression, exception, didCorrectlyThrow)
  14 {
  15     if (didCorrectlyThrow)
  16         log("PASS: " + expression + " should throw a " + exception + ", and did.");
  17     else
  18         log("FAIL: " + expression + " should throw a " + exception + ", but didn't.");
  19 }
  20
  21 if (window.testRunner)
  22     testRunner.dumpAsText();
  23
  24 var o = {
  25     valueOf: function() {
  26         return { }; // should throw, because this is not a primitive value
  27     },
  28
  29     toString: function() {
  30         return { }; // should throw, because this is not a primitive value
  31     }
  32 };
  33
  34 shouldThrow("o == 'a'", "type error", (function() { try { o == 'a'; return false; } catch(e) { return e instanceof TypeError; } })());
  35 shouldThrow("o != 'a'", "type error", (function() { try { o != 'a'; return false; } catch(e) { return e instanceof TypeError; } })());
  36 shouldThrow("o == 0", "type error", (function() { try { o == 'a'; return false; } catch(e) { return e instanceof TypeError; } })());
  37 shouldThrow("o != 0", "type error", (function() { try { o != 'a'; return false; } catch(e) { return e instanceof TypeError; } })());
  38 </script>