Add solc 0.6.x integration tests

package.json

@@ -44,9 +44,9 @@
     "web3-utils": "^1.0.0"
   },
   "devDependencies": {
-    "@nomiclabs/buidler": "^1.0.1",
-    "@nomiclabs/buidler-truffle5": "^1.0.1",
-    "@nomiclabs/buidler-web3": "^1.0.1",
+    "@nomiclabs/buidler": "^1.0.2",
+    "@nomiclabs/buidler-truffle5": "^1.0.2",
+    "@nomiclabs/buidler-web3": "^1.0.2",
     "@truffle/contract": "^4.0.36",
     "decache": "^4.5.1",
     "ganache-core-sc": "^2.7.0-sc.0",

test/integration/projects/solc-6/.solcover.js

@@ -0,0 +1,8 @@
+// Testing hooks
+const fn = (msg, config) => config.logger.log(msg);
+
+module.exports = {
+  skipFiles: ['Migrations.sol'],
+  silent: process.env.SILENT ? true : false,
+  istanbulReporter: ['json-summary', 'text'],
+}

test/integration/projects/solc-6/buidler.config.js

@@ -0,0 +1,10 @@
+const { loadPluginFile } = require("@nomiclabs/buidler/plugins-testing");
+loadPluginFile(__dirname + "/../plugins/buidler.plugin");
+usePlugin("@nomiclabs/buidler-truffle5");
+
+module.exports={
+  defaultNetwork: "buidlerevm",
+  solc: {
+    version: "0.6.0"
+  }
+};

test/integration/projects/solc-6/contracts/ContractA.sol

@@ -0,0 +1,56 @@
+pragma solidity ^0.6.0;
+
+import "./ContractB.sol";
+
+/**
+ * New syntaxes in solc 0.6.x
+ */
+contract ContractA is ContractB {
+  uint counter;
+  uint errorCount;
+
+  modifier overridden() override {
+    require(true);
+    _;
+  }
+
+  constructor() public {
+  }
+
+  function simpleSet(uint i)
+    public
+    override(ContractB)
+  {
+    counter = counter + i;
+  }
+
+  function simpleView(uint i)
+    view
+    overridden
+    external
+    returns (uint, bool)
+  {
+    return (counter + i, true);
+  }
+
+  function tryCatch() public returns (uint, bool) {
+    try this.simpleView(5) returns (uint, bool) {
+        return (2, true);
+    } catch Error(string memory) {
+        errorCount++;
+        return (0, false);
+    } catch (bytes memory) {
+        errorCount++;
+        return (0, false);
+    }
+  }
+
+  function arraySlice() public pure {
+    abi.decode(msg.data[4:], (uint, uint));
+  }
+
+  function payableFn() public pure {
+    address x;
+    address y = payable(x);
+  }
+}

test/integration/projects/solc-6/contracts/ContractB.sol

@@ -0,0 +1,18 @@
+pragma solidity ^0.6.0;
+
+
+contract ContractB {
+  uint value;
+
+  constructor() public {
+  }
+
+  modifier overridden() virtual {
+    require(true);
+    _;
+  }
+
+  function simpleSet(uint i) public virtual {
+    value = 5;
+  }
+}

test/integration/projects/solc-6/test/test.js

@@ -0,0 +1,27 @@
+const ContractA = artifacts.require("ContractA");
+
+contract("contracta", function(accounts) {
+  let instance;
+
+  before(async () => instance = await ContractA.new())
+
+  it('simpleSet (overridden method)', async function(){
+    await instance.simpleSet(5);
+  });
+
+  it('simpleView (overridden modifier)', async function(){
+    await instance.simpleView(5);
+  });
+
+  it('tryCatch', async function(){
+    await instance.tryCatch();
+  });
+
+  it('arraySlice', async function(){
+    await instance.arraySlice();
+  });
+
+  it('payableFn', async function(){
+    await instance.payableFn();
+  })
+});

test/integration/projects/solc-6/truffle-config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  networks: {},
+  mocha: {},
+  compilers: {
+    solc: {
+      version: "0.6.0"
+    }
+  }
+}

test/sources/js/wallet.js

@@ -17,6 +17,7 @@ contract('Wallet', accounts => {
       from: accounts[0],
     });
 
+    // Throws invalid opcode if compiled w/ solc >= 0.5.14 & default EVM version
     const balance = await walletB.getBalance();
     assert.equal(balance.toNumber(), 100);
   });

test/util/integration.js

@@ -152,6 +152,9 @@ function getDefaultBuidlerConfig() {
         url: "http://127.0.0.1:8545",
       }
     },
+    solc: {
+      evmVersion: 'petersburg'
+    }
   }
 
   return vals;