added deserialiser tests, fixed some bugs in deserialised

tests/deserialise/root.zig

@@ -0,0 +1,40 @@
+const std = @import("std");
+
+pub const binary = @import("binary.zig");
+pub const string = @import("string.zig");
+pub const int = @import("int.zig");
+
+pub const msgpack = @import("msgpack");
+
+const deserialise = msgpack.deserialise.deserialise;
+
+test {
+    @import("std").testing.refAllDecls(@This());
+}
+
+test "nil" {
+    const alloc = std.testing.allocator;
+
+    const obj = try deserialise(alloc, &[_]u8{0xc0});
+    defer obj.deinit(alloc);
+
+    try std.testing.expectEqualDeep(msgpack.Object.nil, obj);
+}
+
+test "bool" {
+    const alloc = std.testing.allocator;
+
+    {
+        const obj = try deserialise(alloc, &[_]u8{0xc2});
+        defer obj.deinit(alloc);
+
+        try std.testing.expectEqualDeep(msgpack.Object{ .bool = false }, obj);
+    }
+
+    {
+        const obj = try deserialise(alloc, &[_]u8{0xc3});
+        defer obj.deinit(alloc);
+
+        try std.testing.expectEqualDeep(msgpack.Object{ .bool = true }, obj);
+    }
+}