erofs-freebsd-out-tree/tests/TC036-file-read-random.md

Test Case: Random Regular-File Reads

Test ID: TC036-file-read-random

Objective

Verify independent start, middle, and end pread(2) ranges from a deterministic 1 MiB regular file.

Fixture

Use images/flat.erofs, source/flat/random-test.bin, and the three expected/random-*.bin files. Evidence asserts layout 0 and exact size.

Procedure

./read_probe pread "$mnt/random-test.bin" 0 10240 /tmp/tc036-start
./read_probe pread "$mnt/random-test.bin" 512000 10240 /tmp/tc036-mid
./read_probe pread "$mnt/random-test.bin" 1024000 24576 /tmp/tc036-end
cmp /tmp/repo22-g1/expected/random-start.bin /tmp/tc036-start
cmp /tmp/repo22-g1/expected/random-mid.bin /tmp/tc036-mid
cmp /tmp/repo22-g1/expected/random-end.bin /tmp/tc036-end
sha256 /tmp/tc036-start /tmp/tc036-mid /tmp/tc036-end

Expected Results

• Every bounded pread reports its requested byte count and exact offset.
• All three ranges match independently generated source ranges; cleanup passes.