Random tests have floating point errors.

The samples should be string values to seven decimal places

But 0 expects 0.000000 instead of 0.0000000, which only has 6 decimal places. Similarly, when values have leading zeroes it expects more than 7 decimal places, like -0.06421801 instead of -0.0642180, -0.004701102 instead of -0.0047011, ... This is actually 7 significant digits, not 7 decimal places.

Seriously, 6 solves without anyone catching this?

The input is not real MIDI: delta time in MIDI note packets are given as integer ticks, not actual duration in seconds. In the current design there would also be possibilities that a note do not last a whole tick.

Throw an error if the MIDI input is invalid (see more here).

The provided link is just a Wikipedia dump to the MIDI article. Please be more specific what is actually wanted.

Why the hell is Test.expectError used with empty string argument, 4 times, in the test fixture? This is intentional hostile abuse of test framework.

• needs random tests
• the reference solution (hence the tests) is incorrect: A and B notes are associated with the wrong octave (1 higher than what they should be) description is misleading (see edits below)

EDIT: Mmmmmh, wait... Might be that the description is misleading, without the link, actually... I'm not musician, so I don't know, but does A0 exists or not? the current state of the description suggests it doesn't, hence my second point above, but is that the case, actually?

EDIT²: confirmed, that's the info missing with the link. A0 is considered to be after C0, not before...

Link in the description is dead.

Julia translation kumited. I've changed the description a little, the description of how octave numbering works didn't match the MIDI spec or the test cases.

No random tests. Test.expectError does not provide useful information on fail.

Would really appreciate a full example. Just use the input you showed, and show us the output.

Also, I'm pretty confused about the whole 10,000 times a second thing. If the length is 0.5 (assuming this means half a second--though you should explain this also), shouldn't there be 5,000 values?

Also, does each sine wave start at 0 degrees?

It sounds like an interesting kata to me, but for someone who doesn't understand the details of sound engineering it's difficult to grasp.