license added in tests libraries

apps/remix-ide/src/app/editor/example-contracts.js

 'use strict'
 
 const storage = `// SPDX-License-Identifier: GPL-3.0
+
 pragma solidity >=0.7.0 <0.8.0;
 
 /**
@@ -29,6 +30,7 @@ contract Storage {
 }`
 
 const owner = `// SPDX-License-Identifier: GPL-3.0
+
 pragma solidity >=0.7.0 <0.8.0;
 
 /**
@@ -80,6 +82,7 @@ contract Owner {
 }`
 
 const ballot = `// SPDX-License-Identifier: GPL-3.0
+
 pragma solidity >=0.7.0 <0.8.0;
 
 /** 
@@ -219,6 +222,7 @@ contract Ballot {
 `
 
 var ballotTest = `// SPDX-License-Identifier: GPL-3.0
+
 pragma solidity >=0.7.0 <0.8.0;
 import "remix_tests.sol"; // this import is automatically injected by Remix.
 import "../3_Ballot.sol";

libs/remix-tests/sol/tests.sol.ts

-module.exports = `
+module.exports = `// SPDX-License-Identifier: GPL-3.0
+
 pragma solidity >=0.4.22 <0.8.0;
 
 library Assert {

libs/remix-tests/sol/tests_accounts.sol.ts

-module.exports = `
+module.exports = `// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity >=0.4.22 <0.8.0;
+
 library TestsAccounts {
     function getAccount(uint index) public returns (address) {
         >accounts<