tests: Add size changes to the `xeyes` test.

It should trigger some shape related code in the core which wasn't
hit reliably until now.

tests/test-client-shape.lua

@@ -11,6 +11,18 @@ runner.run_steps{
             assert(type(a) == "number", a)
         end
         if #client.get() == 1 then
+            local c = client.get()[1]
+
+            local geo = c:geometry()
+
+            -- Resize it to test shape change events.
+            c:geometry {
+                x      = geo.x,
+                y      = geo.y,
+                width  = geo.width * 2,
+                height = geo.height * 2,
+            }
+
             return true
         end
     end,
@@ -27,8 +39,15 @@ runner.run_steps{
         assert(not surface.load_silently(c.client_shape_clip, false))
         assert(not surface.load_silently(c.shape_clip, false))
 
+        return true
+    end,
+
+    function()
+        client.get()[1]:kill()
         return true
     end
+
+
 }
 
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