[PATCH v5 06/18] diff tests: test that "mode" is passed when sorting

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Piggy-back on the recently added fsck tests for mode comparisons in
mktree and assert that diff-tree also does the right thing in this
implausible scenario.

As with the other tests I've added in preceding commits, these tests
will fail if the mode is the same or reversed, respectively.

The diff-tree code being tested here was originally added back in
.9174026cfe (Add "diff-tree" program to show which files have changed
between two trees., 2005-04-09).

Unlike the other tests I've added there are existing tests for both of
these scenarios. Breaking that function as described above will make
tests in t4002-diff-basic.sh, t6409-merge-subtree.sh and
t4037-diff-r-t-dirs.sh fail.

I think it's good to have tests for this regardless, so let's add
these.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 t/t1450-fsck.sh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index 46125190b45..5dd842bb82c 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -362,6 +362,28 @@ test_expect_success 'tree entry with duplicate type mismatching objects' '
 	)
 '
 
+test_expect_success 'diff-tree stressing tree-diff.c::tree_entry_pathcmp(), not the same type' '
+	zero=$(test_oid zero) &&
+	git -C duplicate-entry diff-tree broken-commit-1 broken-commit-2 >1-to-2 &&
+	grep "$zero" 1-to-2 >lines &&
+	test_line_count = 2 lines &&
+
+	git -C duplicate-entry diff-tree broken-commit-2 broken-commit-1 >2-to-1 &&
+	grep "$zero" 2-to-1 >lines &&
+	test_line_count = 2 lines
+'
+
+test_expect_success 'diff-tree stressing tree-diff.c::tree_entry_pathcmp(), types not reversed' '
+	blob_ok=$(git -C duplicate-entry rev-parse broken-commit-2:A) &&
+	git -C duplicate-entry diff-tree --diff-filter=A broken-commit-1 broken-commit-2 >1-to-2 &&
+	grep "$blob_ok" 1-to-2 &&
+	test_line_count = 1 1-to-2 &&
+
+	git -C duplicate-entry diff-tree --diff-filter=A broken-commit-2 broken-commit-1 >2-to-1 &&
+	grep "$blob_ok" 2-to-1 &&
+	test_line_count = 1 2-to-1
+'
+
 test_expect_success 'tag pointing to nonexistent' '
 	badoid=$(test_oid deadbeef) &&
 	cat >invalid-tag <<-EOF &&
-- 
2.31.1.474.g72d45d12706




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