[Tarantool-patches] [PATCH luajit 4/5] test: fix warnings found with luacheck in misclib*

[Igor Munkin via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

Since the regular static analysis has not been enabled for the test
chunks in LuaJIT repository yet, the tests for recently implemented
features still produce luacheck warnings.

The most of the issues are fixed in scope of the commit
8fc103fb1a21c28185a1942e75d8d9485e3aade7 ('test: fix warnings spotted by
luacheck') and this patch fixes the remaining ones.

Fixes tarantool/tarantool#5631
Part of tarantool/tarantool#4862
Part of tarantool/tarantool#5470
Follows up tarantool/tarantool#5187

Reported-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>
---
 .../misclib-getmetrics-capi.test.lua          | 22 ++++++---------
 .../misclib-getmetrics-lapi.test.lua          | 28 +++++++++----------
 2 files changed, 23 insertions(+), 27 deletions(-)

diff --git a/test/tarantool-tests/misclib-getmetrics-capi.test.lua b/test/tarantool-tests/misclib-getmetrics-capi.test.lua
index c418e9f..d409ea9 100755
--- a/test/tarantool-tests/misclib-getmetrics-capi.test.lua
+++ b/test/tarantool-tests/misclib-getmetrics-capi.test.lua
@@ -38,29 +38,29 @@ test:ok(testgetmetrics.objcount(function(iterations)
     }
 
     -- Separate objects creations to separate jit traces.
-    for i = 1, iterations do
-        table.insert(placeholder.str, tostring(i))
+    for _ = 1, iterations do
+        table.insert(placeholder.str, tostring(_))
     end
 
-    for i = 1, iterations do
-        table.insert(placeholder.tab, {i})
+    for _ = 1, iterations do
+        table.insert(placeholder.tab, {_})
     end
 
-    for i = 1, iterations do
+    for _ = 1, iterations do
         table.insert(placeholder.udata, newproxy())
     end
 
-    for i = 1, iterations do
+    for _ = 1, iterations do
         -- Check counting of VLA/VLS/aligned cdata.
         table.insert(placeholder.cdata, ffi.new("char[?]", 4))
     end
 
-    for i = 1, iterations do
+    for _ = 1, iterations do
         -- Check counting of non-VLA/VLS/aligned cdata.
-        table.insert(placeholder.cdata, ffi.new("uint64_t", i))
+        table.insert(placeholder.cdata, ffi.new("uint64_t", _))
     end
 
-    placeholder = nil
+    placeholder = nil -- luacheck: no unused
     -- Restore default jit settings.
     jit.opt.start(unpack(jit_opt_default))
 end))
@@ -69,15 +69,11 @@ end))
 test:ok(testgetmetrics.snap_restores(function()
     jit.opt.start(0, "hotloop=1")
 
-    local old_metrics = misc.getmetrics()
-
     local sum = 0
     for i = 1, 20 do
         sum = sum + i
     end
 
-    local new_metrics = misc.getmetrics()
-
     -- Restore default jit settings.
     jit.opt.start(unpack(jit_opt_default))
 
diff --git a/test/tarantool-tests/misclib-getmetrics-lapi.test.lua b/test/tarantool-tests/misclib-getmetrics-lapi.test.lua
index 959293d..d54caac 100755
--- a/test/tarantool-tests/misclib-getmetrics-lapi.test.lua
+++ b/test/tarantool-tests/misclib-getmetrics-lapi.test.lua
@@ -58,10 +58,10 @@ test:test("gc-allocated-freed", function(subtest)
     until collectgarbage("count") == count
 
     -- Bump getmetrics table and string keys allocation.
-    local old_metrics = misc.getmetrics()
+    misc.getmetrics()
 
     -- Remember allocated size for getmetrics table.
-    old_metrics = misc.getmetrics()
+    local old_metrics = misc.getmetrics()
 
     collectgarbage("collect")
 
@@ -77,7 +77,7 @@ test:test("gc-allocated-freed", function(subtest)
     -- (such as concatenation, string.format, table.concat)
     -- while creating the string. Otherwise gc_freed/gc_allocated
     -- relations will not be so straightforward.
-    local str = string.sub("Hello, world", 1, 5)
+    local str = string.sub("Hello, world", 1, 5) -- luacheck: no unused
     collectgarbage("collect")
 
     new_metrics = misc.getmetrics()
@@ -196,29 +196,29 @@ test:test("objcount", function(subtest)
     }
 
     -- Separate objects creations to separate jit traces.
-    for i = 1, 1000 do
-        table.insert(placeholder.str, tostring(i))
+    for _ = 1, 1000 do
+        table.insert(placeholder.str, tostring(_))
     end
 
-    for i = 1, 1000 do
-        table.insert(placeholder.tab, {i})
+    for _ = 1, 1000 do
+        table.insert(placeholder.tab, {_})
     end
 
-    for i = 1, 1000 do
+    for _ = 1, 1000 do
         table.insert(placeholder.udata, newproxy())
     end
 
-    for i = 1, 1000 do
+    for _ = 1, 1000 do
         -- Check counting of VLA/VLS/aligned cdata.
         table.insert(placeholder.cdata, ffi.new("char[?]", 4))
     end
 
-    for i = 1, 1000 do
+    for _ = 1, 1000 do
         -- Check counting of non-VLA/VLS/aligned cdata.
-        table.insert(placeholder.cdata, ffi.new("uint64_t", i))
+        table.insert(placeholder.cdata, ffi.new("uint64_t", _))
     end
 
-    placeholder = nil
+    placeholder = nil -- luacheck: no unused
     collectgarbage("collect")
     local new_metrics = misc.getmetrics()
 
@@ -372,7 +372,7 @@ test:test("strhash", function(subtest)
     assert(new_metrics.strhash_miss - old_metrics.strhash_miss == 0)
     old_metrics = new_metrics
 
-    local str1  = "strhash".."_hit"
+    local _ = "strhash".."_hit"
 
     new_metrics = misc.getmetrics()
     assert(new_metrics.strhash_hit - old_metrics.strhash_hit == 20)
@@ -384,7 +384,7 @@ test:test("strhash", function(subtest)
     assert(new_metrics.strhash_miss - old_metrics.strhash_miss == 0)
     old_metrics = new_metrics
 
-    local str2 = "new".."string"
+    local _ = "new".."string"
 
     new_metrics = misc.getmetrics()
     assert(new_metrics.strhash_hit - old_metrics.strhash_hit == 19)
-- 
2.25.0