Crypto-BEP20-DevToken-Test-Allowance

it ("allow account some allowance", async() => {
        devToken = await DevToken.deployed();

        
        try{
            // Give account(0) access too 100 tokens on creator
            await devToken.approve('0x0000000000000000000000000000000000000000', 100);    
        }catch(error){
            assert.equal(error.reason, 'DevToken: approve cannot be to zero address', "Should be able to approve zero address");
        }

        try{
            // Give account 1 access too 100 tokens on zero account
            await devToken.approve(accounts[1], 100);    
        }catch(error){
            assert.fail(error); // shold not fail
        }

        // Verify by checking allowance
        let allowance = await devToken.allowance(accounts[0], accounts[1]);

        assert.equal(allowance.toNumber(), 100, "Allowance was not correctly inserted");
    })

    it("transfering with allowance", async() => {
        devToken = await DevToken.deployed();

        try{
            // Account 1 should have 100 tokens by now to use on account 0 
            // lets try using more 
            await devToken.transferFrom(accounts[0], accounts[2], 200, { from: accounts[1] } );
        }catch(error){

            assert.equal(error.reason, "DevToken: You cannot spend that much on this account", "Failed to detect overspending")
        }
        let init_allowance = await devToken.allowance(accounts[0], accounts[1]);
        console.log("init balalnce: ", init_allowance.toNumber())
        try{
            // Account 1 should have 100 tokens by now to use on account 0 
            // lets try using more 
            let worked = await devToken.transferFrom(accounts[0], accounts[2], 50, {from:accounts[1]});
        }catch(error){
            assert.fail(error);
        }

        // Make sure allowance was changed
        let allowance = await devToken.allowance(accounts[0], accounts[1]);
        assert.equal(allowance.toNumber(), 50, "The allowance should have been decreased by 50")

        
    })