Add tests for bitmap.

test/all.js

@@ -2,3 +2,4 @@
 require('./mouse');
 require('./keyboard');
 require('./screen');
+require('./bitmap');

test/bitmap.js

@@ -0,0 +1,81 @@
+var test = require('tape');
+var robot = require('..');
+
+var params =
+{
+	'width': 'number',
+	'height': 'number',
+	'byteWidth': 'number',
+	'bitsPerPixel': 'number',
+	'bytesPerPixel': 'number',
+	'image': 'object'
+};
+
+test('Get a bitmap.', function(t)
+{
+	t.plan(1);
+	t.ok(robot.screen.capture(), 'got a bitmap.');
+});
+
+test('Get a bitmap and check the parameters.', function(t)
+{
+	t.plan(6);
+	var img = robot.screen.capture();
+
+	for (var x in params)
+	{
+		t.equal(typeof img[x], params[x], 'make sure ' + x  + ' is a ' + params[x] + '.');
+	}
+});
+
+test('Get a bitmap of a specific size.', function(t)
+{
+	var size = 10;
+	t.plan(2);
+	var img = robot.screen.capture(0, 0, size, size);
+
+	t.equals(img.height, size, 'make sure image is expected height.');
+	t.equals(img.width, size, 'make sure image is expected width.');
+});
+
+test('Get a bitmap and make sure the colorAt works as expected.', function(t)
+{
+	t.plan(7);
+	var img = robot.screen.capture();
+	var hex = img.colorAt(0, 0);
+
+	t.ok(/^[0-9A-F]{6}$/i.test(hex), "colorAt returned valid hex.");
+
+	var screenSize = robot.getScreenSize();
+
+	t.throws(function()
+	{
+		img.colorAt(0, screenSize.height);
+	}, /are outside the bitmap/, 'colorAt (0, screen.height) threw an error.');
+
+	t.doesNotThrow(function()
+	{
+		img.colorAt(0, screenSize.height-1);
+	}, /are outside the bitmap/, 'colorAt (0, screen.height-1) did not throw an error.');
+
+	t.throws(function()
+	{
+		img.colorAt(screenSize.width, 0);
+	}, /are outside the bitmap/, 'colorAt (screen.width, 0) threw an error.');
+
+	t.doesNotThrow(function()
+	{
+		img.colorAt(screenSize.width-1, 0);
+	}, /are outside the bitmap/, 'colorAt (screen.width-1, 0) did not throw an error.');
+
+	t.throws(function()
+	{
+		img.colorAt(9999999999999, 0);
+	}, /are outside the bitmap/, 'colorAt (9999999999999, 0) threw an error.');
+
+	// Regression test for https://github.com/octalmage/robotjs/commit/c41f38217fd73f59e6ca63015b51565cd1e7cfb7
+	t.throws(function()
+	{
+		img.colorAt(0, 9999999999999);
+	}, /are outside the bitmap/, 'colorAt (0, 9999999999999) threw an error.');
+});