add InputFrontEnd tests

tests/unit/src/FlxAssert.hx

@@ -59,6 +59,26 @@ class FlxAssert
 			Assert.fail('\nValue\n   ${actual}\nwas equal to\n   ${expected}\n', info);
 	}
 
+	public static function arrayContains<T>(array:Array<T>, item:T, ?msg:String, ?info:PosInfos):Void
+	{
+		if (array.contains(item))
+			Assert.assertionCount++;
+		else if (msg != null)
+			Assert.fail(msg, info);
+		else
+			Assert.fail('\nValue\n   ${item}\nwas not found in array\n   ${array}\n', info);
+	}
+
+	public static function arrayNotContains<T>(array:Array<T>, item:T, ?msg:String, ?info:PosInfos):Void
+	{
+		if (!array.contains(item))
+			Assert.assertionCount++;
+		else if (msg != null)
+			Assert.fail(msg, info);
+		else
+			Assert.fail('\nValue\n   ${item}\nwas found in array\n   ${array}\n', info);
+	}
+
 	public static function pointsEqual(expected:FlxPoint, actual:FlxPoint, ?msg:String, ?info:PosInfos)
 	{
 		if (expected.equals(actual))

tests/unit/src/flixel/system/frontEnds/InputFrontEndTest.hx

@@ -0,0 +1,70 @@
+package flixel.system.frontEnds;
+
+import flixel.system.frontEnds.InputFrontEnd;
+import flixel.FlxG;
+import flixel.input.IFlxInputManager;
+import massive.munit.Assert;
+
+class InputFrontEndTest
+{
+	var inputs:InputFrontEnd;
+
+	@Before
+	function before():Void
+	{
+		@:privateAccess
+		inputs = new InputFrontEnd();
+	}
+
+	@Test
+	@:haxe.warning("-WDeprecated")
+	function testAdd()
+	{
+		final input1 = new CustomInputManager();
+		inputs.add(input1);
+		FlxAssert.arrayContains(inputs.list, input1);
+
+		final input2 = new CustomInputManager();
+		inputs.add(input2);
+		FlxAssert.arrayNotContains(inputs.list, input2);
+	}
+
+	@Test
+	function testAddUniqueType()
+	{
+		final input1 = new CustomInputManager();
+		inputs.addUniqueType(input1);
+		FlxAssert.arrayContains(inputs.list, input1);
+
+		final input2 = new CustomInputManager();
+		inputs.addUniqueType(input2);
+		FlxAssert.arrayNotContains(inputs.list, input2);
+	}
+
+	@Test
+	function testAddInput()
+	{
+		final input1 = new CustomInputManager();
+		inputs.addInput(input1);
+		FlxAssert.arrayContains(inputs.list, input1);
+
+		final oldLength = inputs.list.length;
+		// add again
+		inputs.addInput(input1);
+		Assert.areEqual(inputs.list.length, oldLength);
+
+		final input2 = new CustomInputManager();
+		inputs.addInput(input2);
+		FlxAssert.arrayContains(inputs.list, input2);
+	}
+}
+
+class CustomInputManager implements IFlxInputManager
+{
+	public function new () {}
+	public function destroy() {}
+	public function reset():Void {}
+	function update():Void {}
+	function onFocus():Void {}
+	function onFocusLost():Void {}
+}