diff --git a/tests/lapi/builtin_pairs_test.lua b/tests/lapi/builtin_pairs_test.lua
index 00b4120..2d53b1f 100644
--- a/tests/lapi/builtin_pairs_test.lua
+++ b/tests/lapi/builtin_pairs_test.lua
@@ -28,7 +28,7 @@ local function TestOneInput(buf)
     local MAX_N = 1000
     local count = fdp:consume_integer(0, MAX_N)
     local tbl = fdp:consume_integers(test_lib.MIN_INT, test_lib.MAX_INT, count)
-	-- Use string keys to activate hash part of the table.
+    -- Use string keys to activate hash part of the table.
     tbl.a = fdp:consume_string(test_lib.MAX_STR_LEN)
     tbl.b = fdp:consume_string(test_lib.MAX_STR_LEN)
     for key, value in pairs(tbl) do
diff --git a/tests/lapi/lib.lua b/tests/lapi/lib.lua
index c4bb890..973ee22 100644
--- a/tests/lapi/lib.lua
+++ b/tests/lapi/lib.lua
@@ -86,9 +86,14 @@ local function approx_equal(a, b, epsilon)
     return abs(a - b) <= ((abs(a) < abs(b) and abs(b) or abs(a)) * epsilon)
 end
 
+local locales
+
 local function random_locale(fdp)
-    local locales = {}
+    if locales then
+        return fdp:oneof(locales)
+    end
     local locale_it = io.popen("locale -a"):read("*a"):gmatch("([^\n]*)\n?")
+    locales = {}
     for locale in locale_it do
         table.insert(locales, locale)
     end
diff --git a/tests/lapi/os_date_test.lua b/tests/lapi/os_date_test.lua
index ac63eac..6869374 100644
--- a/tests/lapi/os_date_test.lua
+++ b/tests/lapi/os_date_test.lua
@@ -32,11 +32,12 @@ local function TestOneInput(buf)
     local err_handler = test_lib.err_handler(ignored_msgs)
     local ok, res = xpcall(os.date, err_handler, format, time)
     if not ok then return end
-    assert(type(res) == "string" or
-           type(res) == "table" or
-           -- Undocumented.
-           type(res) == "number" or
-           res == nil)
+    local type_check = type(res) == "string" or type(res) == "table"
+    if test_lib.lua_version() == "LuaJIT" then
+        assert(type_check or type(res) == "number" or res == nil)
+    else
+        assert(type_check)
+    end
 end
 
 local args = {
diff --git a/tests/lapi/os_setlocale_test.lua b/tests/lapi/os_setlocale_test.lua
index 3a8c4cd..492226b 100644
--- a/tests/lapi/os_setlocale_test.lua
+++ b/tests/lapi/os_setlocale_test.lua
@@ -19,7 +19,7 @@ local function TestOneInput(buf)
     })
     local locale_string = os.setlocale(locale, category)
     assert(type(locale_string) == "string" or
-	       locale_string == nil)
+           locale_string == nil)
 end
 
 local args = {
diff --git a/tests/lapi/os_time_test.lua b/tests/lapi/os_time_test.lua
index 981ffed..f8feebd 100644
--- a/tests/lapi/os_time_test.lua
+++ b/tests/lapi/os_time_test.lua
@@ -32,11 +32,12 @@ local function TestOneInput(buf)
     local err_handler = test_lib.err_handler(ignored_msgs)
     local ok, res = xpcall(os.time, err_handler, time)
     if not ok then return end
-    io.stderr:write(type(res) .. "\n")
-    assert(type(res) == "number" or
-           type(res) == "table" or
-           -- Undocumented.
-           res == nil)
+    local type_check = type(res) == "number" or type(res) == "table"
+    if test_lib.lua_version() == "LuaJIT" then
+        assert(type_check or res == nil)
+    else
+        assert(type_check)
+    end
 end
 
 local args = {
diff --git a/tests/lapi/string_byte_test.lua b/tests/lapi/string_byte_test.lua
index e309f72..bea7490 100644
--- a/tests/lapi/string_byte_test.lua
+++ b/tests/lapi/string_byte_test.lua
@@ -1,4 +1,4 @@
---[[
+--[=[[
 SPDX-License-Identifier: ISC
 Copyright (c) 2023-2025, Sergey Bronnikov.
 
@@ -7,28 +7,32 @@ https://www.lua.org/manual/5.3/manual.html#6.4
 
 string.byte gets confused with some out-of-range negative indices,
 https://www.lua.org/bugs.html#5.1.3-9
-]]
 
--- Synopsis: string.byte(s [, i [, j]])
+Synopsis: string.byte(s [, i [, j]])
+]]=]
 
 local luzer = require("luzer")
 local test_lib = require("lib")
 
+local unpack = unpack or table.unpack
+
 local function TestOneInput(buf, _size)
     local fdp = luzer.FuzzedDataProvider(buf)
     os.setlocale(test_lib.random_locale(fdp), "all")
     local str = fdp:consume_string(test_lib.MAX_STR_LEN)
-    local i = fdp:consume_integer(0, test_lib.MAX_INT)
-    local j = fdp:consume_integer(0, test_lib.MAX_INT)
+    local i = fdp:consume_integer(test_lib.MIN_INT, test_lib.MAX_INT)
+    local j = fdp:consume_integer(test_lib.MIN_INT, test_lib.MAX_INT)
     -- `string.byte()` is the same as `str:byte()`.
     assert(string.byte(str, i, j) == str:byte(i, j))
-    local char_code = string.byte(str, i, j)
-    if char_code then
-        assert(type(char_code) == "number")
-        local byte = string.char(char_code)
-        assert(byte)
-        assert(byte == str)
+    local char_codes = { string.byte(str, i, j) }
+    -- `string.byte()` returns `nil` when values `i` or `j` are
+    -- outside the acceptable range (less than zero and greater
+    -- than the length of the string). It is undocumented.
+    if #char_codes == 0 then
+        return
     end
+    local bytes = string.char(unpack(char_codes))
+    assert(bytes == string.sub(str, i, j))
 end
 
 local args = {
diff --git a/tests/lapi/string_rep_test.lua b/tests/lapi/string_rep_test.lua
index 08070e1..36af220 100644
--- a/tests/lapi/string_rep_test.lua
+++ b/tests/lapi/string_rep_test.lua
@@ -5,10 +5,10 @@ Copyright (c) 2023-2025, Sergey Bronnikov.
 6.4 – String Manipulation
 https://www.lua.org/manual/5.3/manual.html#6.4
 
-Synopsis: string.rep(s, n [, sep])
-
 read overflow in 'l_strcmp',
 https://github.com/lua/lua/commit/f623b969325be736297bc1dff48e763c08778243
+
+Synopsis: string.rep(s, n [, sep])
 ]]
 
 local luzer = require("luzer")
@@ -18,7 +18,7 @@ local function TestOneInput(buf, _size)
     local fdp = luzer.FuzzedDataProvider(buf)
     os.setlocale(test_lib.random_locale(fdp), "all")
     -- Huge length leads to slow units.
-    local n = fdp:consume_integer(0, test_lib.MAX_STR_LEN)
+    local n = fdp:consume_integer(1, test_lib.MAX_STR_LEN)
     local s = fdp:consume_string(test_lib.MAX_STR_LEN)
     local sep = fdp:consume_string(test_lib.MAX_STR_LEN)
     local len = string.len(string.rep(s, n, sep))
diff --git a/tests/lapi/table_clear_test.lua b/tests/lapi/table_clear_test.lua
new file mode 100644
index 0000000..074df89
--- /dev/null
+++ b/tests/lapi/table_clear_test.lua
@@ -0,0 +1,40 @@
+--[[
+SPDX-License-Identifier: ISC
+Copyright (c) 2023-2025, Sergey Bronnikov.
+
+Double-emitting of IR_NEWREF for the same key on the snap replay,
+https://github.com/LuaJIT/LuaJIT/issues/1128
+
+X86/X64 load fusion conflict detection doesn't detect table.clear,
+https://github.com/LuaJIT/LuaJIT/issues/1117
+
+Problem of HREFK with table.clear,
+https://github.com/LuaJIT/LuaJIT/issues/792
+
+Add support for freeing memory manually,
+https://github.com/LuaJIT/LuaJIT/issues/620
+
+Synopsis: table.clear(tbl)
+]]
+
+local luzer = require("luzer")
+local test_lib = require("lib")
+
+if test_lib.lua_version() ~= "LuaJIT" then
+    print("Unsupported version.")
+    os.exit(0)
+end
+
+local table_clear = require("table.clear")
+
+local function TestOneInput(buf)
+    local fdp = luzer.FuzzedDataProvider(buf)
+    local count = fdp:consume_integer(0, test_lib.MAX_INT64)
+    local tbl = fdp:consume_strings(test_lib.MAX_STR_LEN, count)
+    table_clear(tbl)
+end
+
+local args = {
+    artifact_prefix = "table_clear_",
+}
+luzer.Fuzz(TestOneInput, nil, args)
diff --git a/tests/lapi/table_remove_test.lua b/tests/lapi/table_remove_test.lua
index 330d946..323e0b6 100644
--- a/tests/lapi/table_remove_test.lua
+++ b/tests/lapi/table_remove_test.lua
@@ -16,11 +16,11 @@ local test_lib = require("lib")
 
 local function TestOneInput(buf, _size)
     local fdp = luzer.FuzzedDataProvider(buf)
-    local count = fdp:consume_integer(0, test_lib.MAX_INT)
+    local count = fdp:consume_integer(1, test_lib.MAX_INT)
     local tbl = fdp:consume_strings(test_lib.MAX_STR_LEN, count)
 
     local indices_count = fdp:consume_integer(0, #tbl)
-    local indices = fdp:consume_integers(0, count, indices_count)
+    local indices = fdp:consume_integers(1, count, indices_count)
     for _, idx in ipairs(indices) do
         local old_v = tbl[idx]
         assert(table.remove(tbl, idx) == old_v)