Sergey,

This patch moves the aforementioned test from the <misc> to the <lang/>
directory, includes it in <index>, and names the subtest.

Part of tarantool/tarantool#9398
---

 test/LuaJIT-tests/lang/index        |  1 +
 test/LuaJIT-tests/lang/wbarrier.lua | 11 +++++++++++
 test/LuaJIT-tests/misc/wbarrier.lua |  7 -------
 3 files changed, 12 insertions(+), 7 deletions(-)
 create mode 100644 test/LuaJIT-tests/lang/wbarrier.lua
 delete mode 100644 test/LuaJIT-tests/misc/wbarrier.lua

diff --git a/test/LuaJIT-tests/lang/index b/test/LuaJIT-tests/lang/index
index 8da748d0..ab4dc45d 100644
--- a/test/LuaJIT-tests/lang/index
+++ b/test/LuaJIT-tests/lang/index
@@ -32,3 +32,4 @@ gc_stack.lua
 gc_step.lua
 goto.lua +goto
 meta
+wbarrier.lua
diff --git a/test/LuaJIT-tests/lang/wbarrier.lua b/test/LuaJIT-tests/lang/wbarrier.lua
new file mode 100644
index 00000000..3bee865e
--- /dev/null
+++ b/test/LuaJIT-tests/lang/wbarrier.lua
@@ -0,0 +1,11 @@
+do --- Check write barrier when insert strings.
+  local t = {}
+
+  for i = 1, 20000 do
+    t[i] = tostring(i)
+  end
+
+  for i = 1, #t do
+    assert(t[i] == tostring(i))
+  end
+end
diff --git a/test/LuaJIT-tests/misc/wbarrier.lua b/test/LuaJIT-tests/misc/wbarrier.lua
deleted file mode 100644
index 5536625a..00000000
--- a/test/LuaJIT-tests/misc/wbarrier.lua
+++ /dev/null
@@ -1,7 +0,0 @@
-local t={}
-for i=1,20000 do
-  t[i] = tostring(i)
-end
-for i=1,#t do
-  assert(t[i] == tostring(i))
-end