Merge pull request #4953 from minrk/wait-for-idle

add utils.wait_for_idle in js tests

IPython/html/tests/casperjs/util.js

@@ -30,6 +30,15 b' casper.open_new_notebook = function () {'
     this.waitForSelector('.CodeMirror-code');
     // and make sure the kernel has started
     this.waitFor( this.kernel_running  );
+    // track the IPython busy/idle state
+    this.thenEvaluate(function () {
+        $([IPython.events]).on('status_idle.Kernel',function () {
+            IPython._status = 'idle';
+        });
+        $([IPython.events]).on('status_busy.Kernel',function () {
+            IPython._status = 'busy';
+        });
+    });
 };
 
 // return whether or not the kernel is running
@@ -57,8 +66,17 b' casper.delete_current_notebook = function () {'
     });
 };
 
+casper.wait_for_idle = function () {
+    this.waitFor(function () {
+        return this.evaluate(function () {
+            return IPython._status == 'idle';
+        });
+    });
+};
+
 // wait for the nth output in a given cell
 casper.wait_for_output = function (cell_num, out_num) {
+    this.wait_for_idle();
     out_num = out_num || 0;
     this.then(function() {
         this.waitFor(function (c, o) {
@@ -157,7 +175,7 b' casper.execute_cell = function(index){'
 casper.execute_cell_then = function(index, then_callback) {
     var return_val = this.execute_cell(index);
 
-    this.wait_for_output(index);
+    this.wait_for_idle();
 
     var that = this;
     this.then(function(){