add SetDutyCycle mock

[rursprung]

this is the 1.0 equivalent of the old PwmPin trait (the mock for this has been added in #52).

note that the test coverage is fully handled by the doc test which is why there's no additional mod test in this file.

this fixes #73

(note: this replaces #74 which was targeting the now defunct 1-alpha branch)

[rursprung]

it seems that the format of the assertion message is now different in nightly? i.e. the failure seems to be unrelated...

       panic message: `"assertion `left == right` failed: i2c::write unexpected mode\n  left: Read\n right: Write"`,
 expected substring: `"assertion failed: `(left == right)`\n  left: `Read`,\n right: `Write`: i2c::write unexpected mode"`

(however, i have the very odd experience that without my PR it builds fine locally but with it it also fails with cargo +nightly test --all-features... i can't explain that right now 😕)

[dbrgn]

Yeah, nightly apparently changed the assertion format. If we adapt to nightly, then tests on stable will fail.

I think I'll simply reduce the assertions to a smaller subset of the message.

[dbrgn]

@rursprung should be fixed on main, could you rebase?

[rursprung]

@rursprung should be fixed on main, could you rebase?

rebased, works fine now. thanks for fixing this!

[rursprung]

@dbrgn: while it wasn't strictly necessary (would've merged just fine also without this) i've now rebased this on top of the latest main and also adjusted a comment which still had a link to the e-h beta documentation.
once this PR lands in a release of e-h-m (it was my hope that it'd land in the release you just did) i'll be able to point to your release again in my crate (since i need this)

thanks for your work on this crate!

[rursprung]

thanks for all your feedback @dbrgn, i've incorporated it now

[dbrgn]

Thanks for the updates!

[dbrgn]

Released in 0.10.0-rc.2.