RSpec `let` gotcha! Plus assignment
Recently I tried something like
```ruby
let(:array_of_numbers) { [1, 2, 3, 4, 5] }
it 'should have a description' do
expect([1, 2, 3, 4, 5, 6]).to eql(array_of_numbers += [6])
end
```
It did not work, as in the plus assignment statement ruby expects `array_of_numbers` to be a variable not a method call.
```ruby
let(:array_of_numbers) { [1, 2, 3, 4, 5] }
it 'should have a description' do
expect([1, 2, 3, 4, 5, 6]).to eql(array_of_numbers += [6])
end
```
It did not work, as in the plus assignment statement ruby expects `array_of_numbers` to be a variable not a method call.
