ens-usernames/test/erc20token.js

exports.Test = (contractsConfig, afterDeploy) => {
    describe("ERC20Token", async function() {
      this.timeout(0);
      var ERC20Token;
      var accountsArr;
      before(function(done) {
        contractsConfig["ERC20Receiver"] = {};
        EmbarkSpec.deployAll(contractsConfig, async function(accounts) { 
          ERC20Token = Contract;
          accountsArr = accounts; 
          await afterDeploy(accounts, Contract);
          done()
        });
      });

    it("should transfer 1 token", async function() {
      let initialBalance0 = await ERC20Token.methods.balanceOf(accountsArr[0]).call();
      let initialBalance1 = await ERC20Token.methods.balanceOf(accountsArr[1]).call();
      await ERC20Token.methods.transfer(accountsArr[1],1).send({from: accountsArr[0]});
      let result0 = await ERC20Token.methods.balanceOf(accountsArr[0]).call();
      let result1 = await ERC20Token.methods.balanceOf(accountsArr[1]).call();
      
      assert.equal(result0, +initialBalance0-1, "account 0 balance unexpected");
      assert.equal(result1, +initialBalance1+1, "account 1 balance unexpected");
    });

    it("should set approved amount", async function() {
      await ERC20Token.methods.approve(accountsArr[2],10000000).send({from: accountsArr[0]});
      let result = await ERC20Token.methods.allowance(accountsArr[0], accountsArr[2]).call();
      assert.equal(result, 10000000);
    });

    it("should consume allowance amount", async function() {
      let initialAllowance = await ERC20Token.methods.allowance(accountsArr[0], accountsArr[2]).call();
      await ERC20Token.methods.transferFrom(accountsArr[0], accountsArr[0],1).send({from: accountsArr[2]});
      let result = await ERC20Token.methods.allowance(accountsArr[0], accountsArr[2]).call();
      
      assert.equal(result, +initialAllowance-1);
    });
    
    it("should transfer approved amount", async function() {
      let initialBalance0 = await ERC20Token.methods.balanceOf(accountsArr[0]).call();
      let initialBalance1 = await ERC20Token.methods.balanceOf(accountsArr[1]).call();
      await ERC20Token.methods.transferFrom(accountsArr[0], accountsArr[1],1).send({from: accountsArr[2]});
      let result0 = await ERC20Token.methods.balanceOf(accountsArr[0]).call();
      let result1 = await ERC20Token.methods.balanceOf(accountsArr[1]).call();
      
      assert.equal(result0, +initialBalance0-1);
      assert.equal(result1, +initialBalance1+1);
    });


    it("should unset approved amount", async function() {
      await ERC20Token.methods.approve(accountsArr[2],0).send({from: accountsArr[0]});
      let result = await ERC20Token.methods.allowance(accountsArr[0], accountsArr[2]).call();
      assert.equal(result, 0);
    });

    it("should deposit approved amount to contract ERC20Receiver", async function() {
      await ERC20Token.methods.approve(ERC20Receiver.address,10).send({from: accountsArr[0]});
      await ERC20Receiver.methods.depositToken(ERC20Token.address).send({from: accountsArr[0]});
      let result = await ERC20Receiver.methods.tokenBalanceOf(ERC20Token.address, accountsArr[0]).call();
      assert.equal(result, 10, "ERC20Receiver.tokenBalanceOf("+ERC20Token.address+","+accountsArr[0]+") wrong");
    });

    it("should witdraw approved amount from contract ERC20Receiver", async function() {
      let tokenBalance = await ERC20Receiver.methods.tokenBalanceOf(ERC20Token.address, accountsArr[0]).call();
      await ERC20Receiver.methods.withdrawToken(ERC20Token.address, tokenBalance).send({from: accountsArr[0]});
      tokenBalance = await ERC20Receiver.methods.tokenBalanceOf(ERC20Token.address, accountsArr[0]).call();
      assert.equal(tokenBalance, 0, "ERC20Receiver.tokenBalanceOf("+ERC20Token.address+","+accountsArr[0]+") wrong");
    });

    //TODO: include checks for expected events fired


  });
}