增加erc20货币的单元测试

package.json

@@ -4,14 +4,15 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "npx truffle test",
     "deploy:dev": "truffle migrate --network development",
-    "deploy:local": "truffle migrate --network local",
+    "deploy:22": "truffle migrate --network lan22",
     "deploy:bsctest": "truffle migrate --network bsc_testnet"
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
+    "@openzeppelin/test-helpers": "^0.5.15",
     "@truffle/hdwallet-provider": "^2.0.0",
     "chai": "^4.3.4",
     "truffle": "^5.4.23"

test/becoin.test.js

@@ -0,0 +1,46 @@
+const { expect } = require("chai");
+const {
+  BN,
+  constants,
+  expectEvent,
+  expectRevert,
+} = require("@openzeppelin/test-helpers");
+const BECoin = artifacts.require("BECoin");
+
+contract("BECoin", ([owner, other]) => {
+  const amount = new BN(10000);
+
+  beforeEach(async () => {
+    this.coin = await BECoin.new();
+  });
+  it("should put 20000000 * 1e18 BECoin in the first account", async () => {
+    let balance = await this.coin.balanceOf.call(owner);
+    assert.equal(
+      balance.valueOf(),
+      20000000 * 1e18,
+      "20000000 * 1e18 wasn't in the first account"
+    );
+  });
+
+  it("reverts when transferring tokens to the zero address", async () => {
+    // Conditions that trigger a require statement can be precisely tested
+    await expectRevert(
+      this.coin.transfer(constants.ZERO_ADDRESS, amount),
+      "ERC20: transfer to the zero address"
+    );
+  });
+
+  it("should emit Transfer event", async () => {
+    const receipt = await this.coin.transfer(other, amount);
+    expectEvent(receipt, "Transfer", {
+      from: owner,
+      to: other,
+      value: amount,
+    });
+  });
+
+  it("should send coin correctly", async () => {
+    await this.coin.transfer(other, amount);
+    expect(await this.coin.balanceOf(other)).to.be.bignumber.equal(amount);
+  });
+});

truffle-config.js

@@ -91,12 +91,12 @@ module.exports = {
       timeoutBlocks: 200,
       skipDryRun: true
     },
-    development: {
+    lan22: {
       host: "192.168.100.22",     // Localhost (default: none)
       port: 8545,            // Standard Ethereum port (default: none)
       network_id: "*",       // Any network (default: none)
     },
-    local: {
+    development: {
       host: "127.0.0.1",     // Localhost (default: none)
       port: 7545,            // Standard Ethereum port (default: none)
       network_id: "*",       // Any network (default: none)