mjhjmtu

I'm trying to make a test coverage for MetaCoin.
This is my package.json, truffle-config.js and
.solcover.js:

module.exports = 
 port: 8555,
 norpc: true,
 compileCommand: '../node_modules/.bin/truffle compile',
 testCommand: '../node_modules/.bin/truffle test --network coverage'
;

I run the commands ./node_modules/.bin/ganache-cli --port 8555 --gasLimit 0xfffffffffff and ./node_modules/.bin/solidity-coverage and the result is an empty test coverage:

Generating coverage environment
Running: node --max-old-space-size=4096 ../node_modules/.bin/truffle compile --network coverage
(this can take a few seconds)...
Compiling ./contracts/ConvertLib.sol...
Compiling ./contracts/MetaCoin.sol...
Compiling ./contracts/Migrations.sol...
Writing artifacts to ./build/contracts

Instrumenting ./coverageEnv/contracts/ConvertLib.sol
Instrumenting ./coverageEnv/contracts/MetaCoin.sol
Skipping instrumentation of ./coverageEnv/contracts/Migrations.sol
Running: node --max-old-space-size=4096 ../node_modules/.bin/truffle compile --network coverage
(this can take a few seconds)...
Compiling ./contracts/ConvertLib.sol...
Compiling ./contracts/MetaCoin.sol...
Compiling ./contracts/Migrations.sol...
Writing artifacts to ./build/contracts

Running: node --max-old-space-size=4096 ../node_modules/.bin/truffle test --network coverage
(this can take a few seconds)...
Using network 'coverage'.

Compiling ./test/TestMetacoin.sol...


 TestMetacoin
 ✓ testInitialBalanceUsingDeployedContract (89ms)
 ✓ testInitialBalanceWithNewMetaCoin (85ms)

 Contract: MetaCoin
 ✓ should put 10000 MetaCoin in the first account
 ✓ should call a function that depends on a linked library (54ms)
 ✓ should send coin correctly (128ms)


 5 passing (8s)

-----------------|----------|----------|----------|----------|----------------|
File | % Stmts | % Branch | % Funcs | % Lines |Uncovered Lines |
-----------------|----------|----------|----------|----------|----------------|
 contracts/ | 0 | 0 | 0 | 0 | |
 ConvertLib.sol | 0 | 100 | 0 | 0 | 6 |
 MetaCoin.sol | 0 | 0 | 0 | 0 |... 23,24,28,32 |
-----------------|----------|----------|----------|----------|----------------|
All files | 0 | 0 | 0 | 0 | |
-----------------|----------|----------|----------|----------|----------------|

Istanbul coverage reports generated
Cleaning up...
Done. 

I get the same result if I check without tests .

Maybe I'm doing something wrong. Please help me.