Tests for the DOM.showGridOverlay command.

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== Running test suite: DOM.showGridOverlay
-- Running test case: DOM.showGridOverlay.ShowOneGrid
PASS: Should have 0 grids displayed.
Requesting to show grid overlay for first .grid-container
PASS: Should have 1 grid displayed.
Requesting to show a different grid overlay for first .grid-container
PASS: Should have 1 grid displayed.
Requesting to hide grid overlay
PASS: Should have 0 grids displayed.

-- Running test case: DOM.showGridOverlay.ShowTwoGrids
PASS: Should have 0 grids displayed.
Requesting to show first grid overlay
PASS: Should have 1 grid displayed.
Requesting to show second grid overlay
PASS: Should have 2 grids displayed.
Requesting to hide first grid overlay
PASS: Should have 1 grid displayed.
Requesting to hide second grid overlay
PASS: Should have 0 grids displayed.

-- Running test case: DOM.showGridOverlay.HideAllGrids
PASS: Should have 0 grids displayed.
Requesting to show grid overlay
PASS: Should have 1 grid displayed.
Requesting to show a different grid overlay
PASS: Should have 2 grids displayed.
Requesting to hide all grid overlays. Hiding all grids is idempotent and should not throw an error.
PASS: Should have 0 grids displayed.
Requesting to hide all grid overlays again, expecting none to be cleared. Hiding all grids is idempotent and should not throw an error.
PASS: Should have 0 grids displayed.

-- Running test case: DOM.showGridOverlay.HideBeforeShowShouldError
PASS: Should have 0 grids displayed.
Requesting to hide grid overlay for .grid-container
PASS: Should produce an exception.
Error: No grid overlay exists for the node, so cannot clear.
Requesting to hide all grid overlays. Hiding all grids is idempotent and should not throw an error.
PASS: Should have 0 grids displayed.

-- Running test case: DOM.showGridOverlay.ForNonexistentNodeShouldError
PASS: Should have 0 grids displayed.
Requesting to show grid overlay for invalid nodeId -1
PASS: Should produce an exception.
Error: Missing node for given nodeId
PASS: Should have 0 grids displayed.