public async Task Customers_are_correctly_formatted_in_outputfile()
{
var subject = new TestSubject(DefaultSize);
await subject.WriteCustomers(new[]
{
new Customer(1, "Vladimir Makayev", 10.5, 99.4), new Customer(2, "John Doe", 10, 9)
});
Assert.Equal(LineUtility.CombineWithLineBreak("1 Vladimir Makayev", "2 John Doe"), subject.GetContents());
}