New approach for tests

[cpwood]

Test ISBNs have now been removed from the data.json file and from the individual test invocations. Instead, they are now looked up from tests.json.

For each library service, five ISBNs are defined. In the vast majority of cases, these are the ISBN numbers for:

1. Harry Potter and the Philosopher's Stone - J K Rowling
2. Nineteen Eighty Four - George Orwell
3. Pride and Prejudice - Jane Austen
4. Hamlet - William Shakespeare
5. Gangsta Granny - David Walliams

Where a library doesn't have one of the above books, a similar book has been substituted. These are generally "The Complete Works of Shakespeare" and "Gangsta Granny Strikes Again".

The tests require only one of these books to be found. This will hopefully prevent weekly test failures as much as possible where the root cause is a book dropping out of circulation rather than a software problem. There should always be another book to which the tests can fall back.

At the time of these changes, the following library services were excluded:

• Bexley - ongoing issues getting availability searches to work because of cookie requirements;
• Falkirk - catalogue issues - availability lookups are timing out and failing.