1 files changed, 121 insertions, 0 deletions
diff --git a/tests/config/test_utils.lua b/tests/config/test_utils.lua
new file mode 100644
index 0000000..4389293
--- /dev/null
+++ b/tests/config/test_utils.lua
@@ -0,0 +1,121 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+local M = {}
+
+function M.test(f, ...)
+	local res, exception = xpcall(f, debug.traceback, ...)
+	if not res then
+		io.stderr:write(string.format('%s\n', exception))
+		os.exit(2)
+	end
+	return res
+end
+
+function M.table_keys_to_lower(table)
+	local res = {}
+	for k, v in pairs(table) do
+		res[k:lower()] = v
+	end
+	return res
+end
+
+local function contains(pass, fail, table, value, message)
+	message = message or string.format('table contains "%s"', value)
+	for _, v in pairs(table) do
+		if v == value then
+			pass(message)
+			return
+		end
+	end
+	fail(message)
+	return
+end
+
+function M.contains(table, value, message)
+	return contains(pass, fail, table, value, message)
+end
+
+function M.not_contains(table, value, message)
+	return contains(fail, pass, table, value, message)
+end
+
+local function answer2table(pkt)
+	local got_answers = {}
+	local ans_rrs = pkt:rrsets(kres.section.ANSWER)
+	for i = 1, #ans_rrs do
+		rrs = ans_rrs[i]
+		for rri = 0, rrs:rdcount() - 1 do
+			local rr = ans_rrs[i]:txt_fields(rri)
+			got_answers[rr.owner] = got_answers[rr.owner] or {}
+			got_answers[rr.owner][rr.type] = got_answers[rr.owner][rr.type] or {}
+			table.insert(got_answers[rr.owner][rr.type], rr.rdata)
+			table.sort(got_answers[rr.owner][rr.type])
+		end
+	end
+	return got_answers
+end
+
+M.NODATA = -1
+-- Resolve a name and check the answer.  Do *not* return until finished.
+-- expected_rdata is one string or a table of strings in presentation format
+function M.check_answer(desc, qname, qtype, expected_rcode, expected_rdata)
+	assert(type(qtype) == 'number')
+	local qtype_str = kres.tostring.type[qtype]
+	qname = string.lower(qname)
+
+	local expected_answer = {}
+	if expected_rdata ~= nil then
+		if type(expected_rdata) ~= 'table' then
+			expected_rdata = { expected_rdata }
+		end
+		if #expected_rdata > 0 then
+			table.sort(expected_rdata)
+			expected_answer = {
+				[qname] = {
+					[qtype_str] =
+						expected_rdata
+				}
+			}
+		end
+	end
+
+	local wire_rcode = expected_rcode
+	if expected_rcode == kres.rcode.NOERROR and type(expected_rdata) == 'table'
+			and #expected_rdata == 0 then
+		expected_rcode = M.NODATA
+	end
+	if expected_rcode == M.NODATA then wire_rcode = kres.rcode.NOERROR end
+
+	local done = false
+	local callback = function(pkt)
+		ok(pkt, 'answer not dropped')
+		same(pkt:rcode(), wire_rcode,
+		     desc .. ': expecting answer for query ' .. qname .. ' ' .. qtype_str
+		      .. ' with rcode ' .. kres.tostring.rcode[wire_rcode])
+
+		ok((pkt:ancount() > 0) == (expected_rcode == kres.rcode.NOERROR),
+		   desc ..': checking number of answers for ' .. qname .. ' ' .. qtype_str)
+
+		if expected_rdata then
+			same(expected_answer, answer2table(pkt), 'ANSWER section matches')
+		end
+		done = true
+	end
+	resolve(qname, qtype, kres.class.IN, {},
+		function(...)
+			local ok, err = xpcall(callback, debug.traceback, ...)
+			if not ok then
+				fail('error in check_answer callback function')
+				io.stderr:write(string.format('%s\n', err))
+				os.exit(2)
+			end
+		end
+	)
+
+	for delay = 0.1, 5, 0.5 do -- total max 23.5s in 9 steps
+		if done then return end
+		worker.sleep(delay)
+	end
+	if not done then fail('check_answer() timed out') end
+end
+
+return M