test: add TokenVesting tests

test/TokenVesting.test.ts

@@ -0,0 +1,44 @@
+import { ethers, network } from "hardhat"
+import { expect } from "chai"
+import { duration, increase } from "./utilities"
+
+const ONE_WEEK = 604800
+
+const CLIFF_LENGTH = ONE_WEEK
+const DURATION = 2 * ONE_WEEK
+
+describe.only("TokenVesting", function () {
+  let blockTimestamp
+
+  before(async function () {
+    this.signers = await ethers.getSigners()
+    this.alice = this.signers[0]
+
+    this.JoeToken = await ethers.getContractFactory("JoeToken")
+    this.TokenVesting = await ethers.getContractFactory("TokenVesting")
+  })
+
+  beforeEach(async function () {
+    blockTimestamp = (await ethers.provider.getBlock("latest")).timestamp
+    this.joe = await this.JoeToken.deploy()
+    this.tokenVesting = await this.TokenVesting.deploy(this.alice.address, blockTimestamp, CLIFF_LENGTH, DURATION, true)
+    this.joe.mint(this.tokenVesting.address, 100)
+  })
+
+  it("should only allow release of tokens once cliff is passed", async function () {
+    await expect(this.tokenVesting.release(this.joe.address)).to.be.revertedWith("TokenVesting: no tokens are due")
+    await increase(duration.days(6))
+    await expect(this.tokenVesting.release(this.joe.address)).to.be.revertedWith("TokenVesting: no tokens are due")
+    await increase(duration.days(1))
+    await this.tokenVesting.release(this.joe.address)
+    expect(await this.joe.balanceOf(this.alice.address)).to.gt(0)
+    expect(await this.joe.balanceOf(this.tokenVesting.address)).to.lt(100)
+  })
+
+  after(async function () {
+    await network.provider.request({
+      method: "hardhat_reset",
+      params: [],
+    })
+  })
+})