On Jul 22, 6:59 am, Daniel Wellman <etl...@gmail.com> wrote:
> So it seems it's a tradeoff in how much test coverage you need --
> expose the low-level HasXyz interfaces in your view if you need more
> automated test code coverage, or use a gateway interface to the view
> which exposes higher-level methods like getPassword(). Using this
> gateway means you lose test coverage of which specific widgets are
> wired to a given Presenter callback, but you may be able to live with
> that risk (a quick manual exploratory test might give you that
> confidence).
If you think about it, there is more a spectrum than a clear
separation between HasXyz as a low-level interface and a gateway
interface to the view. Based on Ray's talk, the Display interface for
each presenter is in effect the Gateway interface for the View and the
HasClickHandler or HasValue interface components expose the expect
interaction with that object. While these appear to be low-level, it
all depends on how the View itself is implemented. For example, I
could have a display interface for a UI that displays a list of
contacts having a function like this:
interface Display {
...
HasSelectionHandlers<Integer> getSelectionButton(){}
..
}
The Display Gateway object specifies that the SelectionButton is
responsible for producing selection events that return the index of
the list item selected. However, from a UI perspective this could be
implemented as a selection on a ComboBox, an HTML List, response to
clicking on a FlexTable row, clicking on a Radio button, or even
clicking a CheckBox next to the list item and then clicking on a "Make
Selection" button object. The level of granularity depends, like you
said, on how much interaction you want testable using JUnit tests
rather than GWTTestCases, but it is not an either/or choice. I do see
value in having HasXyzHandlers interfaces returned in the View Gateway
interface as a way of testing asynchronous interaction is correct,
since asynchronous interaction cannot be statically verified at
compile time.
-Jason
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