ExampleTokenTest3.js

describe('transfer from', function () {

	beforeEach(async function () {
        	await this.token.approve(this.spender, 99, { from: this.owner });
    	});

    	describe('when the owner has enough balance', function () {
        	const amount = 100;

        	it('reverts', async function () {
           		await assertRevert(this.token.transferFrom(this.owner, this.to, amount, { from: this.owner }));
        	});
    	});

    	describe('when the owner does not have enough balance', function () {
        	const amount = 101;

        	it('reverts', async function () {
            		await assertRevert(this.token.transferFrom(this.owner, this.to, amount, { from: this.owner }));
        	});
    	});
});