diff --git a/run-tests.sh b/run-tests.sh
new file mode 100755
index 000000000..e4b157b9a
--- /dev/null
+++ b/run-tests.sh
@@ -0,0 +1,46 @@
+#! /bin/sh
+# Copyright (C) 2018 David Capello
+
+if [[ "$ASEPRITE" == "" ]]; then
+    echo ASEPRITE env var must be pointing to the Aseprite executable
+    exit 1
+fi
+
+function fail() {
+    echo FAIL
+    echo $BASH_SOURCE:$BASH_LINENO: error: $*
+    exit 1
+}
+
+echo ----------------------------------------------------------------------
+echo $ASEPRITE --version
+$ASEPRITE --version
+
+echo ----------------------------------------------------------------------
+echo "Testing console..."
+$ASEPRITE -b --script scripts/console_assert.js > tmp
+! grep -q Error tmp && fail
+! grep -q "this should be in the output" tmp && fail
+grep -q "this should not be in the output" tmp && fail
+
+$ASEPRITE -b --script scripts/console_log.js > tmp
+cat >tmp_expected <<EOF
+hello world
+1 2 3
+EOF
+! diff -u tmp tmp_expected && fail
+
+echo ----------------------------------------------------------------------
+echo "Testing scripts..."
+for jsfile in scripts/*.js ; do
+    [[ $jsfile =~ console ]] && continue
+
+    echo "Running $jsfile"
+    if ! $ASEPRITE -b --script $jsfile > tmp ; then
+        fail
+    fi
+done
+
+echo ----------------------------------------------------------------------
+echo Done
+echo ----------------------------------------------------------------------
diff --git a/scripts/app_pixel_color.js b/scripts/app_pixel_color.js
new file mode 100644
index 000000000..1e7d1ecb7
--- /dev/null
+++ b/scripts/app_pixel_color.js
@@ -0,0 +1,9 @@
+// Copyright (C) 2018  David Capello
+
+var pc = app.pixelColor
+console.assert(0 == pc.rgba(0, 0, 0, 0))
+console.assert(1 == pc.rgbaR(pc.rgba(1, 2, 3, 4)))
+console.assert(2 == pc.rgbaG(pc.rgba(1, 2, 3, 4)))
+console.assert(3 == pc.rgbaB(pc.rgba(1, 2, 3, 4)))
+console.assert(4 == pc.rgbaA(pc.rgba(1, 2, 3, 4)))
+console.assert(0xff104080 == pc.rgba(0x80, 0x40, 0x10, 0xff))
diff --git a/scripts/app_version.js b/scripts/app_version.js
new file mode 100644
index 000000000..03c3bcb8e
--- /dev/null
+++ b/scripts/app_version.js
@@ -0,0 +1,4 @@
+// Copyright (C) 2018  David Capello
+
+console.assert(app.version[0] == "1")
+console.assert(app.version[1] == ".")
diff --git a/scripts/console_assert.js b/scripts/console_assert.js
new file mode 100644
index 000000000..cfa0729c5
--- /dev/null
+++ b/scripts/console_assert.js
@@ -0,0 +1,6 @@
+// Copyright (C) 2018  David Capello
+
+console.assert(true)
+console.log("this should be in the output")
+console.assert(false)
+console.log("this should not be in the output")
diff --git a/scripts/console_log.js b/scripts/console_log.js
new file mode 100644
index 000000000..bd856a026
--- /dev/null
+++ b/scripts/console_log.js
@@ -0,0 +1,4 @@
+// Copyright (C) 2018  David Capello
+
+console.log("hello world")
+console.log(1, 2, 3)
diff --git a/scripts/constants.js b/scripts/constants.js
new file mode 100644
index 000000000..911eef2b7
--- /dev/null
+++ b/scripts/constants.js
@@ -0,0 +1,5 @@
+// Copyright (C) 2018  David Capello
+
+console.assert(ColorMode.RGB == 0)
+console.assert(ColorMode.GRAYSCALE == 1)
+console.assert(ColorMode.INDEXED == 2)
diff --git a/scripts/point.js b/scripts/point.js
new file mode 100644
index 000000000..616a049cd
--- /dev/null
+++ b/scripts/point.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2018  David Capello
+
+var pt = new Point()
+console.assert(pt.x == 0)
+console.assert(pt.y == 0)
+
+pt = new Point(1, 2)
+console.assert(pt.x == 1)
+console.assert(pt.y == 2)
+
+var pt2 = new Point(pt)
+console.assert(pt2.x == 1)
+console.assert(pt2.y == 2)
+
+pt.x = 5;
+pt.y = 6;
+console.assert(pt.x == 5)
+console.assert(pt.y == 6)
+
+// TODO fix this
+console.log(JSON.stringify(pt))
diff --git a/scripts/rectangle.js b/scripts/rectangle.js
new file mode 100644
index 000000000..ce3b650aa
--- /dev/null
+++ b/scripts/rectangle.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2018  David Capello
+
+var rc = new Rectangle()
+console.assert(rc.x == 0)
+console.assert(rc.y == 0)
+console.assert(rc.width == 0)
+console.assert(rc.height == 0)
+
+rc = new Rectangle(1, 2, 3, 4)
+console.assert(rc.x == 1)
+console.assert(rc.y == 2)
+console.assert(rc.width == 3)
+console.assert(rc.height == 4)
+
+var rc2 = new Rectangle(rc)
+console.assert(rc2.x == 1)
+console.assert(rc2.y == 2)
+console.assert(rc2.width == 3)
+console.assert(rc2.height == 4)
+
+rc.x = 5;
+rc.y = 6;
+rc.width = 7;
+rc.height = 8;
+console.assert(rc.x == 5)
+console.assert(rc.y == 6)
+console.assert(rc.width == 7)
+console.assert(rc.height == 8)
+
+// TODO fix this
+console.log(JSON.stringify(rc))
diff --git a/scripts/selection.js b/scripts/selection.js
new file mode 100644
index 000000000..08abfd7c1
--- /dev/null
+++ b/scripts/selection.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2018  David Capello
+
+// Isolated selection
+var a = new Selection()
+console.assert(a.bounds.x == 0)
+console.assert(a.bounds.y == 0)
+console.assert(a.bounds.width == 0)
+console.assert(a.bounds.height == 0)
+
+a.select(1, 2, 3, 4);
+console.assert(a.bounds.x == 1)
+console.assert(a.bounds.y == 2)
+console.assert(a.bounds.width == 3)
+console.assert(a.bounds.height == 4)
+
+a.select({ 'x': 5, 'y': 6, 'width': 7, 'height': 8 })
+console.assert(a.bounds.x == 5)
+console.assert(a.bounds.y == 6)
+console.assert(a.bounds.width == 7)
+console.assert(a.bounds.height == 8)
+
+a.deselect();
+console.assert(a.bounds.x == 0)
+console.assert(a.bounds.y == 0)
+console.assert(a.bounds.width == 0)
+console.assert(a.bounds.height == 0)
+
+// Selection related to a sprite
+// TODO
diff --git a/scripts/size.js b/scripts/size.js
new file mode 100644
index 000000000..8561babbb
--- /dev/null
+++ b/scripts/size.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2018  David Capello
+
+var sz = new Size()
+console.assert(sz.width == 0)
+console.assert(sz.height == 0)
+
+sz = new Size(3, 4)
+console.assert(sz.width == 3)
+console.assert(sz.height == 4)
+
+var sz2 = new Size(sz)
+console.assert(sz2.width == 3)
+console.assert(sz2.height == 4)
+
+sz.width = 7;
+sz.height = 8;
+console.assert(sz.width == 7)
+console.assert(sz.height == 8)
+
+// TODO fix this
+console.log(JSON.stringify(sz))
diff --git a/scripts/sprite.js b/scripts/sprite.js
new file mode 100644
index 000000000..42a199df0
--- /dev/null
+++ b/scripts/sprite.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2018  David Capello
+
+var a = new Sprite(32, 64)
+console.assert(a.width == 32)
+console.assert(a.height == 64)
+console.assert(a.colorMode == ColorMode.RGB) // RGB by default
+a.selection.select(2, 3, 4, 5)
+console.assert(a.selection.bounds.x == 2)
+console.assert(a.selection.bounds.y == 3)
+console.assert(a.selection.bounds.width == 4)
+console.assert(a.selection.bounds.height == 5)
+a.crop()
+console.assert(a.width == 4)
+console.assert(a.height == 5)
+a.resize(6, 8)
+console.assert(a.width == 6)
+console.assert(a.height == 8)
+a.crop({ 'x': -1, 'y': -1, 'width': 20, 'height': 30 })
+console.assert(a.width == 20)
+console.assert(a.height == 30)
+
+// resize sprite setting width/height
+a.width = 8
+a.height = 10
+console.assert(a.width == 8)
+console.assert(a.height == 10)
+
+var b = new Sprite(4, 4, ColorMode.INDEXED)
+console.assert(b.width == 4)
+console.assert(b.height == 4)
+console.assert(b.colorMode == ColorMode.INDEXED)