Add tests for paint_bucket tool

scripts/paint_bucket.lua

@@ -0,0 +1,55 @@
+-- Copyright (C) 2020-2021  Igara Studio S.A.
+--
+-- This file is released under the terms of the MIT license.
+-- Read LICENSE.txt for more information.
+
+dofile('./test_utils.lua')
+
+app.activeTool = 'paint_bucket'
+assert(app.activeTool.id == 'paint_bucket')
+assert(app.activeBrush.type == BrushType.CIRCLE)
+assert(app.activeBrush.size == 1)
+assert(app.activeBrush.angle == 0)
+assert(app.preferences.tool('paint_bucket').floodfill.pixel_connectivity == 0)
+
+local function test_paint_bucket(colorMode, a, b, c)
+  local spr = Sprite(4, 4, colorMode)
+  local img = app.activeImage
+
+  array_to_pixels({ a, a, a, a,
+                    a, b, b, a,
+                    a, a, b, a,
+                    a, a, a, b, }, img)
+
+  app.useTool{ points={Point(0, 0)}, color=b }
+  expect_img(img, { b, b, b, b,
+                    b, b, b, b,
+                    b, b, b, b,
+                    b, b, b, b, })
+
+  app.undo()
+  -- FOUR_CONNECTED=0
+  app.preferences.tool('paint_bucket').floodfill.pixel_connectivity = 0
+  assert(app.preferences.tool('paint_bucket').floodfill.pixel_connectivity == 0)
+  app.useTool{ points={Point(1, 1)}, color=c }
+  expect_img(img, { a, a, a, a,
+                    a, c, c, a,
+                    a, a, c, a,
+                    a, a, a, b, })
+
+  app.undo()
+  -- EIGHT_CONNECTED=1
+  app.preferences.tool('paint_bucket').floodfill.pixel_connectivity = 1
+  assert(app.preferences.tool('paint_bucket').floodfill.pixel_connectivity == 1)
+  app.useTool{ points={Point(1, 1)}, color=c }
+  expect_img(img, { a, a, a, a,
+                    a, c, c, a,
+                    a, a, c, a,
+                    a, a, a, c, })
+end
+
+local rgba = app.pixelColor.rgba
+local gray = app.pixelColor.graya
+test_paint_bucket(ColorMode.RGB, rgba(0, 0, 0), rgba(128, 128, 128), rgba(255, 255, 255))
+test_paint_bucket(ColorMode.GRAYSCALE, gray(0), gray(128), gray(255))
+test_paint_bucket(ColorMode.INDEXED, 1, 2, 3)