tests/lapi: add table.clear test

The patch adds a test for `table.clear()` function that is
present in LuaJIT. Follows up the commit ee032e7
("tests/lapi: add table tests").

Follows up #142

Author: ligurio

tests/lapi/table_clear_test.lua

@@ -0,0 +1,46 @@
+--[[
+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)
+    -- Make sure the table is empty.
+    local n_items = 0
+    for _ in pairs(tbl) do
+        n_items = n_items + 1
+    end
+    assert(n_items == 0)
+end
+
+local args = {
+    artifact_prefix = "table_clear_",
+}
+luzer.Fuzz(TestOneInput, nil, args)