chore: add GUT test framework

addons/gut/scratch/bitwise.gd

@@ -0,0 +1,41 @@
+extends SceneTree
+
+func dec2bistr(decimal_value, max_bits = 31):
+	var binary_string = ""
+	var temp
+	var count = max_bits
+
+	while(count >= 0):
+		temp = decimal_value >> count
+		if(temp & 1):
+			binary_string = binary_string + "1"
+		else:
+			binary_string = binary_string + "0"
+		count -= 1
+
+	return binary_string
+
+func print_binary(i):
+	print(str(i).rpad(5), dec2bistr(i, 10))
+
+func print_has_index_set(i, index):
+	var s = str(str(i).rpad(10), dec2bistr(i, 10))
+	var result = i & (1 << index) != 0
+	s += str(' has ', index, ' = ', result)
+	print(s)
+
+func _init():
+	print_has_index_set(5, 0)
+	print_has_index_set(5, 1)
+	print_has_index_set(5, 2)
+	print()
+	print_has_index_set(17, 4)
+	print()
+	print_has_index_set(73, 3)
+	print_has_index_set(73, 6)
+
+
+	print(1<< 2)
+	print(1 << 3)
+	print(1 << 6)
+	quit()