Are there any Java test frameworks which allows to check (assert) some visual properties of tested applications?
For example, that some button displayed, or that text fit into frame and so on?
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1 Answer
There is Jemmy Java test library which allows to capture images of controls, compare it with golden screenshot (strictly and unstrictrly), verify java entities borders, etc.
5 Comments
Dims
What is golden screenshot?
Sergei Grinev
golden (or master, or reference) screenshot is one which you expect your application to produce. Thus comparing current screenshot with golden one you can find out if application works correctly.
Dims
How screenshots can be compared portable? For example on Mac and Win?
Sergei Grinev
Oh, this is complex problem. You either make comparison non-strict (e.g. allow slight differences in rendering, see AverageDistanceImageComparator in jemmy) or you provide different set of images for each platform (which increases maintenance costs)
Shura
There are 3 algorithms implemented in Jemmy, besides strict pixel-to-pixel comparison. 1: Allow some percentage of pixels to go wrong in actual image, comparing to a reference (golden) image. 2: Maximum from pixel-to-pixel color distance for given two images. 3: Average color distance over all pixels in given two images. For two colors (r1, g1, b1) and (r2, g2, b2), "color distance" is equal to sqrt((r2-r1)^2 + (g2-g1)^2 + (b2-b1)^2) Despite the simplicity, all three algorithms work well in different cases.