make test more resilient to future changes by not testing the count and not testing the internal value of the registered mime type.
make test more resilient to future changes by not
testing the count and not testing the internal value
of the registered mime type.

Ideally all mime type registration should be cleaned up
in teardown.

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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