[patch] [cla] Tree: use doh.robot to test keyboard a11y

[Joseph Scheuhammer]

Manually testing that dijit.Tree is keyboard accessible, and that it implements the keystrokes as documented, is time consuming. Such testing should be automated.

Also, there should be tests for the aria properties for tree and its nodes.

[Joseph Scheuhammer]

The attached patch, "8000.patch", has automated tests for:

• aria roles for tree
• aria-expanded state for tree (will fail until patch for #7998 is applied)
• aria roles for tree nodes
• aria-expanded state for tree nodes
• tab navigation to and from tree
• tab navigation to and from when a leaf was focussed before tabbing away.

[Joseph Scheuhammer]

Attaching patch, "8000a.patch" that, in addition to doing everything that the "8000.patch" does, includes robot tests for keyboard a11y:

• expand/collapse nodes using arrow keys.
• use of DOWN and RIGHT arrows to navigate to the first leaf.
• use of HOME and END keys to navigate to the first and last visible nodes in the tree.

Note that the tests of the END keystroke will fail, pending resolution of #8028.

[Becky Gibson]

this just needs review and checkin so moving back to 1.3

[Becky Gibson]

fixed in [15950]

[bill]

In [29966]:

Inline functions used only once, and remove "treeTests" wrapper around helper functions. The wrapper was of questionable value. Refs #8000.

[bill]

In [29967]:

Group startup, runTest, tearDown functions together, refs #8000.

[bill]

In [29968]:

Rearrange definitions of tests to be next to doh.register() calls, refs #8000.

[bill]

In [30028]:

Combine tests for basic navigation (tab, arrows, home, and end keys, plus selection) into one section, in order to simplify test and to better check that tab stops work correctly in typical usage. Refs #8000.

[bill]

In [30047]:

Catch errors during _setup(), refs #8000

[bill]

In [30608]:

fix race conditions with test not waiting for TreeNodes to expand/collapse before setting aria roles, refs #8000