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tests/lapi: add utf8 tests
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‎tests/lapi/utf8_char_test.lua

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--[[
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SPDX-License-Identifier: ISC
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Copyright (c) 2023-2025, Sergey Bronnikov.
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6.5 – UTF-8 Support
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https://www.lua.org/manual/5.3/manual.html#6.5
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Synopsis: utf8.char(...)
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]]
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local luzer = require("luzer")
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local test_lib = require("lib")
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local MAX_INT = test_lib.MAX_INT
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local MIN_INT = test_lib.MIN_INT
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-- The function is introduced in Lua 5.3.
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if test_lib.lua_current_version_lt_than(5, 3) then
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print("Unsupported version.")
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os.exit()
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end
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local unpack = unpack or table.unpack
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local ignored_msgs = {
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"value out of range",
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}
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local function TestOneInput(buf)
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local fdp = luzer.FuzzedDataProvider(buf)
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-- Limit count to prevent error "too many results to unpack".
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local MAX_N = 1000
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local count = fdp:consume_integer(1, MAX_N)
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local chars = fdp:consume_integers(MIN_INT, MAX_INT, count)
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os.setlocale(test_lib.random_locale(fdp), "all")
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local err_handler = test_lib.err_handler(ignored_msgs)
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local ok, _ = xpcall(utf8.char, err_handler, unpack(chars))
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if not ok then return end
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end
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local args = {
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artifact_prefix = "utf8_char_",
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}
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luzer.Fuzz(TestOneInput, nil, args)

‎tests/lapi/utf8_codepoint_test.lua

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--[=[[
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SPDX-License-Identifier: ISC
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Copyright (c) 2023-2025, Sergey Bronnikov.
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6.5 – UTF-8 Support
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https://www.lua.org/manual/5.3/manual.html#6.5
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Synopsis: utf8.codepoint(s [, i [, j [, lax]]])
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]]=]
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local luzer = require("luzer")
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local test_lib = require("lib")
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local MAX_INT = test_lib.MAX_INT
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-- The function is introduced in Lua 5.3.
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if test_lib.lua_current_version_lt_than(5, 3) then
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print("Unsupported version.")
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os.exit()
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end
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local function TestOneInput(buf)
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local fdp = luzer.FuzzedDataProvider(buf)
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local max_len = fdp:consume_integer(1, MAX_INT)
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local s = fdp:consume_string(max_len)
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local i = fdp:consume_integer(0, MAX_INT)
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local j = fdp:consume_integer(0, MAX_INT)
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local lax = fdp:consume_boolean()
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os.setlocale(test_lib.random_locale(fdp), "all")
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pcall(utf8.codepoint, s, i, j, lax)
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end
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local args = {
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artifact_prefix = "utf8_codepoint_",
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}
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luzer.Fuzz(TestOneInput, nil, args)

‎tests/lapi/utf8_codes_test.lua

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--[[
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SPDX-License-Identifier: ISC
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Copyright (c) 2023-2025, Sergey Bronnikov.
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6.5 – UTF-8 Support
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https://www.lua.org/manual/5.3/manual.html#6.5
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'utf8.codes' does not raise an error on spurious continuation bytes,
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https://github.com/lua/lua/commit/a1089b415a3f5c753aa1b40758ffdaf28d5701b0
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Synopsis: utf8.codes(s [, lax])
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]]
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local luzer = require("luzer")
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local test_lib = require("lib")
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local MAX_INT = test_lib.MAX_INT
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-- The function is introduced in Lua 5.3.
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if test_lib.lua_current_version_lt_than(5, 3) then
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print("Unsupported version.")
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os.exit()
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end
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local ignored_msgs = {
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"invalid UTF-8 code",
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}
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local function TestOneInput(buf)
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local fdp = luzer.FuzzedDataProvider(buf)
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local max_len = fdp:consume_integer(1, MAX_INT)
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local s = fdp:consume_string(max_len)
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local lax = fdp:consume_boolean()
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os.setlocale(test_lib.random_locale(fdp), "all")
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local err_handler = test_lib.err_handler(ignored_msgs)
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local ok, _ = xpcall(utf8.codes, err_handler, s, lax)
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if not ok then return end
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end
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local args = {
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artifact_prefix = "utf8_codes_",
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}
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luzer.Fuzz(TestOneInput, nil, args)

‎tests/lapi/utf8_len_test.lua

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--[=[[
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SPDX-License-Identifier: ISC
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Copyright (c) 2023-2025, Sergey Bronnikov.
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6.5 – UTF-8 Support
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https://www.lua.org/manual/5.3/manual.html#6.5
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Synopsis: utf8.len(s [, i [, j [, lax]]])
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]]=]
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local luzer = require("luzer")
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local test_lib = require("lib")
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local MAX_INT = test_lib.MAX_INT
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-- The function is introduced in Lua 5.3.
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if test_lib.lua_current_version_lt_than(5, 3) then
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print("Unsupported version.")
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os.exit()
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end
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local function TestOneInput(buf)
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local fdp = luzer.FuzzedDataProvider(buf)
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local max_len = fdp:consume_integer(1, MAX_INT)
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local s = fdp:consume_string(max_len)
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local i = fdp:consume_integer(0, MAX_INT)
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local j = fdp:consume_integer(0, MAX_INT)
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local lax = fdp:consume_boolean()
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os.setlocale(test_lib.random_locale(fdp), "all")
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pcall(utf8.len, s, i, j, lax)
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end
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local args = {
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artifact_prefix = "utf8_len_",
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}
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luzer.Fuzz(TestOneInput, nil, args)

‎tests/lapi/utf8_offset_test.lua

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--[[
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SPDX-License-Identifier: ISC
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Copyright (c) 2023-2025, Sergey Bronnikov.
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6.5 – UTF-8 Support
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https://www.lua.org/manual/5.3/manual.html#6.5
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Synopsis: utf8.offset(s, n [, i])
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]]
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local luzer = require("luzer")
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local test_lib = require("lib")
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local MAX_INT = test_lib.MAX_INT
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local MIN_INT = test_lib.MIN_INT
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-- The function is introduced in Lua 5.3.
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if test_lib.lua_current_version_lt_than(5, 3) then
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print("Unsupported version.")
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os.exit()
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end
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local function TestOneInput(buf)
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local fdp = luzer.FuzzedDataProvider(buf)
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local max_len = fdp:consume_integer(0, MAX_INT)
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local s = fdp:consume_string(max_len)
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local n = fdp:consume_integer(MIN_INT, MAX_INT)
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local i = fdp:consume_integer(1, MAX_INT)
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os.setlocale(test_lib.random_locale(fdp), "all")
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utf8.offset(s, n, i)
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end
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local args = {
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artifact_prefix = "utf8_offset_",
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}
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luzer.Fuzz(TestOneInput, nil, args)

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