Add proxy test

test/Proxy.ts

@@ -0,0 +1,86 @@
+import { ethers, upgrades } from 'hardhat';
+import { expect } from 'chai';
+import { loadFixture } from '@nomicfoundation/hardhat-network-helpers';
+import { beforeEach } from 'mocha';
+
+describe('SFC', () => {
+  const fixture = async () => {
+    const [user, owner] = await ethers.getSigners();
+    const sfc = await upgrades.deployProxy(await ethers.getContractFactory('SFC'), {
+      kind: 'uups',
+      initializer: false,
+    });
+
+    const epoch = 10;
+    const supply = 100_000;
+    const nodeDriver = ethers.Wallet.createRandom();
+    const constsManager = ethers.Wallet.createRandom();
+
+    // initialize the sfc
+    await sfc.initialize(epoch, supply, nodeDriver, constsManager, owner);
+
+    return {
+      owner,
+      user,
+      sfc,
+      epoch,
+      supply,
+      nodeDriver,
+      constsManager,
+    };
+  };
+
+  beforeEach(async function () {
+    Object.assign(this, await loadFixture(fixture));
+  });
+
+  describe('Initialization', () => {
+    it('Should succeed and initialize', async function () {
+      expect(await this.sfc.currentSealedEpoch()).to.equal(this.epoch);
+      expect(await this.sfc.constsAddress()).to.equal(this.constsManager);
+      expect(await this.sfc.totalSupply()).to.equal(this.supply);
+      expect(await this.sfc.owner()).to.equal(this.owner);
+    });
+
+    it('Should revert when already initialized', async function () {
+      await expect(
+        this.sfc.initialize(this.epoch, this.supply, this.nodeDriver, this.constsManager, this.owner),
+      ).to.be.revertedWithCustomError(this.sfc, 'InvalidInitialization');
+    });
+
+    describe('Upgrade', () => {
+      it('Should revert when not owner', async function () {
+        await expect(
+          upgrades.upgradeProxy(this.sfc, (await ethers.getContractFactory('SFC')).connect(this.user)),
+        ).to.be.revertedWithCustomError(this.sfc, 'OwnableUnauthorizedAccount');
+      });
+
+      it('Should succeed and upgrade', async function () {
+        // try updating some variable
+        const newContsManager = ethers.Wallet.createRandom();
+        await this.sfc.connect(this.owner).updateConstsAddress(newContsManager);
+
+        // get the implementation address
+        // the address is stored at slot keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1
+        const implementation = await ethers.provider.getStorage(
+          this.sfc,
+          '0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc',
+        );
+
+        // upgrade proxy with unit test sfc - to skip bytecode optimization and replace the implementation for real
+        await upgrades.upgradeProxy(this.sfc, (await ethers.getContractFactory('UnitTestSFC')).connect(this.owner));
+
+        // check if the variable is still the same
+        expect(await this.sfc.constsAddress()).to.equal(newContsManager);
+
+        // check that the implementation address changed
+        const newImplementation = await ethers.provider.getStorage(
+          this.sfc,
+          '0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc',
+        );
+
+        expect(newImplementation).to.not.equal(implementation);
+      });
+    });
+  });
+});