diff -r affcbccc1dff -r 6ed0d6224d64 spec/util_format_spec.lua
--- a/spec/util_format_spec.lua	Sat Dec 08 17:10:51 2018 +0100
+++ b/spec/util_format_spec.lua	Fri Oct 12 01:29:34 2018 +0200
@@ -11,6 +11,7 @@
 			assert.equal("true", format("%s", true));
 			assert.equal("[true]", format("%d", true));
 			assert.equal("% [true]", format("%%", true));
+			assert.equal("{ }", format("%q", { }));
 		end);
 	end);
 end);