Actually add test

tests/two_color_bitmap_2_visualized.toit

@@ -0,0 +1,52 @@
+// Copyright (C) 2023 Toitware ApS.
+// Use of this source code is governed by a Zero-Clause BSD license that can
+// be found in the TESTS_LICENSE file.
+
+// Tests for Label that the change box is smaller when we only
+// change part of the text.
+
+import bitmap show *
+import expect show *
+import font
+
+import host.file
+import pixel_display show *
+import pixel_display.element show *
+import pixel_display.two_color show WHITE BLACK
+import .png_visualizer
+
+SANS := font.Font.get "sans10"
+
+main args:
+  if args.size != 1:
+    print "Usage: script.toit png-basename"
+    exit 1
+
+  basename := args[0]
+
+  driver := TwoColorPngVisualizer 440 240 basename --outline=BLACK
+  display := TwoColorPixelDisplay driver
+  display.background = WHITE
+
+  heater-red := file.read_content "tests/third_party/pictogrammers/heater-red.png"
+  heater-red-uncompressed := file.read_content "tests/third_party/pictogrammers/heater-red-uncompressed.png"
+  heater-2-bit := file.read_content "tests/third_party/pictogrammers/heater-2-bit.png"
+  heater-2-bit-uncompressed := file.read_content "tests/third_party/pictogrammers/heater-2-bit-uncompressed.png"
+  heater-bw := file.read_content "tests/third_party/pictogrammers/heater-bw.png"
+  heater-bw-uncompressed := file.read_content "tests/third_party/pictogrammers/heater-bw-uncompressed.png"
+  heater-white-bg := file.read_content "tests/third_party/pictogrammers/heater-white-bg.png"
+  heater-white-bg-uncompressed := file.read_content "tests/third_party/pictogrammers/heater-white-bg-uncompressed.png"
+
+  display.add (PngElement --x=100 --y=32 heater-red)
+  display.add (PngElement --x=184 --y=32 heater-2-bit)
+  display.add (PngElement --x=268 --y=32 heater-bw)
+  display.add (PngElement --x=352 --y=32 heater-white-bg)
+
+  display.add (PngElement --x=100 --y=120 heater-red-uncompressed)
+  display.add (PngElement --x=184 --y=120 heater-2-bit-uncompressed)
+  display.add (PngElement --x=268 --y=120 heater-bw-uncompressed)
+  display.add (PngElement --x=352 --y=120 heater-white-bg-uncompressed)
+
+  display.draw
+
+  driver.write_png