Adding more MSE tests.

LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html

Index: LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
diff --git a/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html b/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
index e78e0fece61767e608f826995bd696d2df636d80..2ba416461d4002f4e9e0dfcd8b4127389799c174 100644
--- a/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
+++ b/LayoutTests/http/tests/media/media-source/mediasource-appendwindow.html
@@ -53,10 +53,18 @@
                   "set appendWindowStart throws an exception when equal to appendWindowEnd.");

[wolenetz, 2014/07/26 00:07:15]

I see in our tracking spreadsheet that "set appendWindowEnd value equal to
appendWindowStart" is "NewAdded" as of Jul 21, but I see no corresponding test.
Note that there is distinct code executed by setting appendWindowStart vs
setting appendWindowEnd attribute, so this specific assert_throws() doesn't
exactly cover verification of both attribute's setter logic for this case.
Please add another assert_throws() to really cover the "NewAdded" described
above.

[prabhur1, 2014/07/28 21:36:48]

Done.

[prabhur1, 2014/07/28 21:36:49]

ah..got it!
On 2014/07/26 00:07:15, wolenetz wrote:

 
               assert_throws("InvalidAccessError",
+                  function() { sourceBuffer.appendWindowEnd = sourceBuffer.appendWindowStart - 1; },
+                  "set appendWindowEnd throws an exception if less than appendWindowStart.");
+
+              assert_throws("InvalidAccessError",
                   function() { sourceBuffer.appendWindowStart = -100.0; },
                   "set appendWindowStart throws an exception when less than 0.");
 
               assert_throws("InvalidAccessError",
+                  function() { sourceBuffer.appendWindowEnd = -100.0; },
+                  "set appendWindowEnd throws an exception when less than 0.");
+
+              assert_throws("InvalidAccessError",
                   function() { sourceBuffer.appendWindowEnd = Number.NaN; },
                   "set appendWindowEnd throws an exception if NaN.");