No coverage when Cluster is created inside `helper.lua`

[opomuc]

Luatest v0.5.3 (with 0.5.0 it works correctly)

Steps to reproduce using cartridge-cli:

cartridge create --name myapp
cd myapp
cartridge build
tarantoolctl rocks install luatest 0.5.3
tarantoolctl rocks install luacov

.rocks/bin/luatest --coverage -v
.rocks/bin/luacov .

cat tmp/luacov.report.out

The result will be an empty report.

It works on v0.5.0, but if you move Cluster object creation and cluster start from test/helper.lua to test/integration/api_test.lua you will get the report back