Precalculate state pension date
Remove final 'and'
Convert ternary operator into verbose if statements to for readability
Make sure we're testing the correct outcome

We were lying before by asking for :amount_result
Add state assertions for available_ni_years
Check that there are no NI years left for someone who's 65.
Add test to make sure available years is 45
Check that available_ni_years is set for all steps
Add newline for better markdown rendering

If not, then raw HTML will appear.
Merge pull request #469 from alphagov/v2-calculate-state-pension-updates

V2 calculate state pension updates