Minor readability issue with filenames of test resources

[edwardsph]

The read*, update and delete tests use test.txt when setting up turtle resources. Elsewhere it is test.ttl.
It doesn't affect whether or not the tests work but might help readability if the filenames were consistent with the content types.

[bourgeoa]

We may consider that these tests are doing 2 things at the same time and that it is OK
or relabel them to explicitly state that they update/delete resources with filenames ending with a different media type then the content-type,
or add tests so that they do only one thing at a time

[edwardsph]

Personally, I think for traceability reasons a test should focus on one thing at a time. I suspect the filename difference was a simple copy & paste oversight in this case not a deliberate purpose of the test. Each test should be clear about its purpose.