t6426: fix TODO about making test more comprehensive

t6426.7 (a rename/add testcase) long had a TODO/FIXME comment about
how the test could be improved (with some commented out sample code
that had a few small errors), but those improvements were blocked on
other changes still in progress.  The necessary changes were put in
place years ago but the comment was forgotten.  Remove and fix the
commented out code section and finally remove the big TODO/FIXME
comment.

Signed-off-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: newren

t/t6426-merge-skip-unneeded-updates.sh

@@ -378,42 +378,30 @@ test_expect_success '2c: Modify b & add c VS rename b->c' '
 		test_i18ngrep "CONFLICT (.*/add):" out &&
 		test_must_be_empty err &&
 
-		# Make sure c WAS updated
+		git ls-files -s >index_files &&
+		test_line_count = 2 index_files &&
+
+		# Ensure b was removed
+		test_path_is_missing b &&
+
+		# Make sure c WAS updated...
 		test-tool chmtime --get c >new-mtime &&
-		test $(cat old-mtime) -lt $(cat new-mtime)
-
-		# FIXME: rename/add conflicts are horribly broken right now;
-		# when I get back to my patch series fixing it and
-		# rename/rename(2to1) conflicts to bring them in line with
-		# how add/add conflicts behave, then checks like the below
-		# could be added.  But that patch series is waiting until
-		# the rename-directory-detection series lands, which this
-		# is part of.  And in the mean time, I do not want to further
-		# enforce broken behavior.  So for now, the main test is the
-		# one above that err is an empty file.
-
-		#git ls-files -s >index_files &&
-		#test_line_count = 2 index_files &&
-
-		#git rev-parse >actual :2:c :3:c &&
-		#git rev-parse >expect A:b  A:c  &&
-		#test_cmp expect actual &&
-
-		#git cat-file -p A:b >>merged &&
-		#git cat-file -p A:c >>merge-me &&
-		#>empty &&
-		#test_must_fail git merge-file \
-		#	-L "Temporary merge branch 1" \
-		#	-L "" \
-		#	-L "Temporary merge branch 2" \
-		#	merged empty merge-me &&
-		#sed -e "s/^\([<=>]\)/\1\1\1/" merged >merged-internal &&
-
-		#git hash-object c               >actual &&
-		#git hash-object merged-internal >expect &&
-		#test_cmp expect actual &&
-
-		#test_path_is_missing b
+		test $(cat old-mtime) -lt $(cat new-mtime) &&
+
+		# ...and has correct index entries and working tree contents
+		git rev-parse >actual :2:c :3:c &&
+		git rev-parse >expect A:c  A:b  &&
+		test_cmp expect actual &&
+
+		git cat-file -p A:b >>merge-me &&
+		git cat-file -p A:c >>merged &&
+		>empty &&
+		test_must_fail git merge-file \
+			-L "HEAD" \
+			-L "" \
+			-L "B^0" \
+			merged empty merge-me &&
+		test_cmp merged c
 	)
 '