git merge -m "merge HASH7 and SIDE_HASH7" "$HASH7" &&
B_HASH=$(git rev-parse --verify HEAD) &&
git merge-base --all "$A_HASH" "$B_HASH" > merge_bases.txt &&
- test $(wc -l < merge_bases.txt) = "2" &&
+ test_line_count = 2 merge_bases.txt &&
grep "$HASH5" merge_bases.txt &&
grep "$SIDE_HASH5" merge_bases.txt
'