Add integration test to verify behavior from bundle

packages/truffle/test/scenarios/commands/develop.js

@@ -0,0 +1,46 @@
+const MemoryLogger = require("../memorylogger");
+const CommandRunner = require("../commandrunner");
+const path = require("path");
+const assert = require("assert");
+const Server = require("../server");
+const Reporter = require("../reporter");
+const sandbox = require("../sandbox");
+
+describe("develop", function () {
+  let config;
+  const project = path.join(
+    __dirname,
+    "../../sources/develop",
+  );
+  const logger = new MemoryLogger();
+
+  // before(done => Server.start(done));
+  // after(done => Server.stop(done));
+
+  before(async function () {
+    this.timeout(10000);
+    config = await sandbox.create(project);
+    config.network = "development";
+    config.logger = logger;
+    config.mocha = {
+      reporter: new Reporter(logger),
+    };
+  });
+
+  it("should load snippets", async function () {
+    this.timeout(70000);
+
+    await CommandRunner.run("develop", config);
+    const output = logger.contents();
+
+    //prepare a helpful message to standout in CI log noise
+    const formatLines = (lines) =>
+      lines.split("\n").map((line) => `\t---truffle develop log---\t${line}`)
+        .join("\n");
+    const successMessage = "Snippet Loaded";
+    assert(
+      output.includes(successMessage),
+      `Expected "${successMessage}" in output:\n${formatLines(output)}`,
+    );
+  });
+});

packages/truffle/test/sources/develop/contracts/Migrations.sol

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+pragma solidity ^0.5.0;
+
+contract Migrations {
+  address public owner;
+  uint public last_completed_migration;
+
+  constructor() public {
+    owner = msg.sender;
+  }
+
+  modifier restricted() {
+    if (msg.sender == owner) _;
+  }
+
+  function setCompleted(uint completed) public restricted {
+    last_completed_migration = completed;
+  }
+
+  function upgrade(address new_address) public restricted {
+    Migrations upgraded = Migrations(new_address);
+    upgraded.setCompleted(last_completed_migration);
+  }
+}

packages/truffle/test/sources/develop/contracts/contract.sol

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+pragma solidity ^0.5.0;
+
+contract Contract { }

packages/truffle/test/sources/develop/snippets/helper.js

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+const main = () => {
+  console.log("Snippet Loaded");
+
+  // todo: might need to allow some time for io flush
+  setTimeout(() => process.exit(0), 0);
+}
+
+main();

packages/truffle/test/sources/develop/truffle-config.js

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+module.exports = {
+  networks: {
+    local: {
+      host: "127.0.0.1",
+      port: 8545,
+      network_id: "*",
+      gas: 4700000,
+      gasPrice: 20000000000
+    }
+  },
+  console: {
+    require: [
+      { path: "./snippets/helper.js" }
+    ]
+  }
+};