--- a/spec/util_dbuffer_spec.lua	Thu May 27 13:09:18 2021 +0200
+++ b/spec/util_dbuffer_spec.lua	Tue Jun 29 13:48:14 2021 +0100
@@ -36,6 +36,50 @@
 		end);
 	end);
 
+	describe(":read_until", function ()
+		it("works", function ()
+			local b = dbuffer.new();
+			b:write("hello\n");
+			b:write("world");
+			b:write("\n");
+			b:write("\n\n");
+			b:write("stuff");
+			b:write("more\nand more");
+
+			assert.equal(nil, b:read_until("."));
+			assert.equal(nil, b:read_until("%"));
+			assert.equal("hello\n", b:read_until("\n"));
+			assert.equal("world\n", b:read_until("\n"));
+			assert.equal("\n", b:read_until("\n"));
+			assert.equal("\n", b:read_until("\n"));
+			assert.equal("stu", b:read(3));
+			assert.equal("ffmore\n", b:read_until("\n"));
+			assert.equal(nil, b:read_until("\n"));
+			assert.equal("and more", b:read_chunk());
+		end);
+
+		it("works with multi-character sequences", function ()
+			local b = dbuffer.new();
+			b:write("hello\r\n");
+			b:write("world");
+			b:write("\r\n");
+			b:write("\r\n\r\n");
+			b:write("stuff");
+			b:write("more\r\nand more");
+
+			assert.equal(nil, b:read_until("."));
+			assert.equal(nil, b:read_until("%"));
+			assert.equal("hello\r\n", b:read_until("\r\n"));
+			assert.equal("world\r\n", b:read_until("\r\n"));
+			assert.equal("\r\n", b:read_until("\r\n"));
+			assert.equal("\r\n", b:read_until("\r\n"));
+			assert.equal("stu", b:read(3));
+			assert.equal("ffmore\r\n", b:read_until("\r\n"));
+			assert.equal(nil, b:read_until("\r\n"));
+			assert.equal("and more", b:read_chunk());
+		end);
+	end);
+
 	describe(":discard", function ()
 		local b = dbuffer.new();
 		it("works", function ()