diff --git a/tests/stretch-blt-bounds/Graphics/Pictures/OST_009.jxl b/tests/stretch-blt-bounds/Graphics/Pictures/OST_009.jxl
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index 0000000..3d55e0e
Binary files /dev/null and b/tests/stretch-blt-bounds/Graphics/Pictures/OST_009.jxl differ
diff --git a/tests/stretch-blt-bounds/stretch-blt-test.rb b/tests/stretch-blt-bounds/stretch-blt-test.rb
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--- /dev/null
+++ b/tests/stretch-blt-bounds/stretch-blt-test.rb
@@ -0,0 +1,62 @@
+# Test suite for mkxp-z stretch_blt.
+# Copyright 2024 Splendide Imaginarius.
+# License GPLv2+.
+# Test images are from https://github.com/xinntao/Real-ESRGAN/
+#
+# Run the suite via the "customScript" field in mkxp.json.
+# Use RGSS v3 for best results.
+
+def dump(bmp, spr, desc)
+	spr.bitmap = bmp
+	Graphics.wait(1)
+	bmp.to_file("test-results/" + desc + ".png")
+	System::puts("Finished " + desc)
+end
+
+# Setup graphics
+Graphics.resize_screen(1920, 1080)
+
+# Setup font
+fnt = Font.new("Liberation Sans", 100)
+
+# Setup splash screen
+bmp = Bitmap.new(1920, 1080)
+bmp.fill_rect(0, 0, 1920, 1080, Color.new(0, 0, 0))
+
+bmp.font = fnt
+bmp.draw_text(0, 0, 1920, 540, "stretch_blt Test Suite", 1)
+bmp.draw_text(0, 540, 1920, 540, "Starting Now", 1)
+
+spr = Sprite.new()
+spr.bitmap = bmp
+
+Graphics.wait(1 * 60)
+
+# Tests start here
+
+foreground = Bitmap.new("Graphics/Pictures/OST_009")
+dump(foreground, spr, "foreground")
+
+background = Bitmap.new(1920, 1080)
+background.clear
+dump(background, spr, "background")
+
+composite = background.dup
+composite.stretch_blt(Rect.new(0, 0, 1920, 1080), foreground, Rect.new(0, 0, 1920, 1080))
+dump(composite, spr, "composite")
+
+# Tests are finished, show exit screen
+
+bmp = Bitmap.new(1920, 1080)
+bmp.fill_rect(0, 0, 1920, 1080, Color.new(0, 0, 0))
+
+fnt = Font.new("Liberation Sans", 100)
+
+bmp.font = fnt
+bmp.draw_text(0, 0, 1920, 540, "stretch_blt Test Suite", 1)
+bmp.draw_text(0, 540, 1920, 540, "Has Finished", 1)
+spr.bitmap = bmp
+
+Graphics.wait(1 * 60)
+
+exit
diff --git a/tests/stretch-blt-bounds/test-results/.RESULTS WILL GO HERE b/tests/stretch-blt-bounds/test-results/.RESULTS WILL GO HERE
new file mode 100644
index 0000000..e69de29