# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1611606425 -3600
# Node ID 5d4d90d1eabb88f7a26ef9a11bad05a36215e5a4
# Parent  f2e276bb4ef8a98ac574cfdcec7f8ebd1358fb83
util.interpolation: Add test for #1623

diff -r f2e276bb4ef8 -r 5d4d90d1eabb spec/util_interpolation_spec.lua
--- a/spec/util_interpolation_spec.lua	Mon Jan 25 21:26:45 2021 +0100
+++ b/spec/util_interpolation_spec.lua	Mon Jan 25 21:27:05 2021 +0100
@@ -58,4 +58,9 @@
 		assert.equal(expect_not_nil, render(template_not, { thing = nil }));
 		assert.equal(expect_not_false, render(template_not, { thing = false }));
 	end);
+	it("fixes #1623", function ()
+		local render = require "util.interpolation".new("%b{}", string.upper, { x = string.lower });
+		assert.equal("", render("{foo?}", {  }))
+		assert.equal("", render("{foo|x?}", {  }))
+	end);
 end);