test: update assert messages to show expected and actual values
The test-fs-readfile-pipe unit test has been updated to display the actual and expected values when the assertion fires. The test has also been updated to use a string of regularly formatted x characters as test data so that differences between the actual and expected values are easier to spot.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines