1 files changed, 66 insertions, 0 deletions
diff --git a/spec/util_interpolation_spec.lua b/spec/util_interpolation_spec.lua
new file mode 100644
index 00000000..1d6d22c7
--- /dev/null
+++ b/spec/util_interpolation_spec.lua
@@ -0,0 +1,66 @@
+local template = [[
+{greet!?Hi}, {name?world}!
+]];
+local expect1 = [[
+Hello, WORLD!
+]];
+local expect2 = [[
+Hello, world!
+]];
+local expect3 = [[
+Hi, YOU!
+]];
+local template_array = [[
+{foo#{idx}. {item}
+}]]
+local expect_array = [[
+1. HELLO
+2. WORLD
+]]
+local template_func_pipe = [[
+{foo|sort#{idx}. {item}
+}]]
+local expect_func_pipe = [[
+1. A
+2. B
+3. C
+4. D
+]]
+local template_map = [[
+{foo%{idx}: {item!}
+}]]
+local expect_map = [[
+FOO: bar
+]]
+local template_not = [[
+{thing~Thing is falsy}{thing&Thing is truthy}
+]]
+local expect_not_true = [[
+Thing is truthy
+]]
+local expect_not_nil = [[
+Thing is falsy
+]]
+local expect_not_false = [[
+Thing is falsy
+]]
+describe("util.interpolation", function ()
+	it("renders", function ()
+		local render = require "util.interpolation".new("%b{}", string.upper, { sort = function (t) table.sort(t) return t end });
+		assert.equal(expect1, render(template, { greet = "Hello", name = "world" }));
+		assert.equal(expect2, render(template, { greet = "Hello" }));
+		assert.equal(expect3, render(template, { name = "you" }));
+		assert.equal(expect_array, render(template_array, { foo = { "Hello", "World" } }));
+		assert.equal(expect_func_pipe, render(template_func_pipe, { foo = { "c", "a", "d", "b", } }));
+		-- assert.equal("", render(template_func_pipe, { foo = nil })); -- FIXME
+		assert.equal(expect_map, render(template_map, { foo = { foo = "bar" } }));
+		assert.equal(expect_not_true, render(template_not, { thing = true }));
+		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);