ExampleTokenTest4.js

describe('approve', function () {
	const amount = 100;
	
	it('approves the requested amount', async function () {
    		await this.token.approve(this.to, amount, { from: this.owner });

        	const allowance = await this.token.allowance(this.owner, this.to);
        	assert.equal(allowance, amount);
    	});
	
	it('approves the requested amount and replaces the previous one', async function () {
		await this.token.approve(this.to, 1, { from: this.owner });
        	await this.token.approve(this.to, amount, { from: this.owner });

        	const allowance = await this.token.allowance(this.owner, this.to);
        	assert.equal(allowance, amount);
    	});
});