util.async: Add once() to create temporary runners

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/util_async_spec.lua b/spec/util_async_spec.lua
index ac71e755..f7e469c9 100644
--- a/spec/util_async_spec.lua
+++ b/spec/util_async_spec.lua
@@ -593,4 +593,14 @@ describe("util.async", function()
 			assert.spy(r.watchers.error).was_not.called();
 		end);
 	end);
+
+	describe("#once()", function ()
+		it("should work", function ()
+			local f = spy.new(function ()
+				assert.truthy(async.ready());
+			end);
+			async.once(f);
+			assert.spy(f).was.called();
+		end);
+	end);
 end);