third_party/WebKit/ManualTests/inspector/debugger-watch-expressions.html

   1 <p>Test for
   2 <a href="https://bugs.webkit.org/show_bug.cgi?id=27514">Bug 27514 - add support for watched expression</a>.
   3
   4 <p>To begin test, open web inspector, go the scripts panel
   5 (enabling script debugging if necccessary), and then click this link:
   6 <a href="javascript:runTest()">[begin test]</a>.
   7
   8 <p>Perform the following steps, and note the expected results:
   9
  10 <ol>
  11
  12 <li><p>After clicking the link above, you should now be paused in the body of
  13 the test method, thanks to the <code>debugger</code> statement.
  14
  15 <li><p>Add the following expressions to the "Watch Expressions" section of the
  16 Scripts panel sidebar pane: "<code>this</code>", "<code>a</code>",
  17 "<code>b</code>", "<code>c</code>" and "<code>d</code>". Do <b>NOT</b> enter the quotes.
  18
  19 <li><p>The values of the expressions as shown in the window should a
  20 <code>DOMWindow</code> for <code>this</code>, <code>undefined</code> for
  21 the <code>a</code>, <code>b</code>, and <code>c</code> variables, and a
  22 value of <code>ReferenceError: Can't find variable: d</code>
  23 for the <code>d</code> variable.
  24
  25 <li><p>Note that the value for <code>d</code> should not change for the life of
  26 the test, as the variable <code>d</code> is never introduced in the program.
  27
  28 <li><p>Step through the code, and you'll see the values of <code>a</code>,
  29 <code>b</code>, and <code>c</code> change, as the variables are assigned.
  30 Also note that as the scope changes due to the function invocation, values
  31 will be changed to refer to their current scope.  The <code>this</code>
  32 expression will change when the method is invoked on the object constructed by
  33 the test.
  34
  35 <li><p>Click different stack frames in the Call Stack section to ensure the
  36 expressions change value appropriately as the current stack frame changes.
  37
  38 <li><p>Drive the debugger through the end of the outermost function, so that
  39 the debugger is no longer in paused state.  The values of
  40 <code>a</code>, <code>b</code>, and <code>c</code> should all be a
  41 ReferenceError like <code>d</code>, since these variables are defined in the
  42 <code>runTest()</code> function, and the expressions are being evaluated against
  43 the global object.
  44
  45 <li><p>From the console, execute the statement "<code>a = 1</code>".  The
  46 watch expressions do not currently refresh, so the value for <code>a</code>
  47 should still be ReferenceError.
  48
  49 <li><p>Click the "Refresh" button in the Watch Expressions section and the
  50 value for "<code>a</code>" should now be "<code>1</code>".
  51
  52 <li><p>Close down the browser, start it back up, traverse to a web site,
  53 bring up web inspector, go to the Scripts panel.  You should see the same
  54 set of Watch Expressions in the list as you had when you last used web
  55 inspector.
  56
  57 <li><p>Delete an expression by moving the mouse into the Watch Expression
  58 section, and clicking the X icon which appears to the right of an
  59 expression (on hover).
  60
  61 <li><p>Delete an expression by double-clicking anywhere on a top-level line
  62 of a watch expression, and changing the expression to an empty string or
  63 nothing but white-space.
  64
  65 <li><p>Modify an entry by double-clicking anywhere on a top-level line
  66 of a watch expression, and changing the expression.
  67
  68 <li><p>Enter a new expression, "<code>new Date()</code>".  The value should be
  69 a toString() version of the date.  Repeatedly press the Refresh button to see
  70 the value updated with the current time.
  71
  72 </ol>
  73
  74 <script>
  75 function runTest() {
  76
  77     // a nested function
  78     function subFunction() {
  79         debugger;
  80         var a = "a in subFunction()";
  81
  82         subSubFunction();
  83
  84         // another nested function
  85         function subSubFunction() {
  86             debugger;
  87             var b = "b in subSubFunction()";
  88         }
  89     }
  90
  91     // a class
  92     function aClass() {
  93         this.x = "xxx";
  94         this.y = "yyy";
  95     }
  96
  97     aClass.prototype.aMethod = function() {
  98         debugger;
  99         var c = "c in aMethod()";
 100     }
 101
 102     // main logic
 103     debugger;
 104
 105     var a = "a in runTest()";
 106     var b = "b in runTest()";
 107     var c = "c in runTest()";
 108
 109     subFunction();
 110
 111     var object = new aClass();
 112     object.aMethod();
 113
 114 }
 115 </script>