As I noted in commit 85b9c2459c I noticed
that the testing of the invalidity of invalid struct "deserialization"
was not sound. That was because if one error was not actually thrown,
the test would still be satisfied by the following error. However, if
only that specific thing was wrong, no error would be thrown and an
invalid struct would be accepted.
Therefore I now changed those tests to also check the exception type and
its message. This means that if an exception is missing, it is
immediately picked up.
I also found out that one exception was actually wrong. I had mistyped
`TypeError` as `TypError`. Funnily enough that still causes an exception
to be thrown at that location, but a `ReferenceError` instead of the
`TypeError`. Such bugs should now be more easily noticable.
There are two reasons for this:
1. I've reconsidered my original plan to store the past games in
localStorage, because that would make it difficult to display them in
historical order, and would necessitate more complex logic for
updating and removing sessions.
2. I've been unhappy with how I did the testing of the serialization and
deserialization logic. So I redid it, and now I'm satisfied with it.
I've noticed that the testing methodology for the invalid fromStruct
method tests is not fully sound. If a check is accidentally removed that
test would not detect that, as long as it is not the very last. That is
because then the next error triggers. Therefore that will need to be
revisited.
