Add failing test for diffs containing empty lines

Author: cruessler

gix-blame/tests/blame.rs

@@ -140,6 +140,12 @@ mktest!(added_line_before_changed_line, "added-line-before-changed-line", 3);
 mktest!(same_line_changed_twice, "same-line-changed-twice", 2);
 mktest!(coalesce_adjacent_hunks, "coalesce-adjacent-hunks", 1);
 
+// As of 2024-09-24, these tests are expected to fail.
+//
+// Context: https://github.com/Byron/gitoxide/pull/1453#issuecomment-2371013904
+mktest!(empty_lines_histogram, "empty-lines-histogram", 5);
+mktest!(empty_lines_myers, "empty-lines-myers", 5);
+
 #[test]
 fn process_change_works() {
     let mut lines_blamed = Vec::new();

gix-blame/tests/fixtures/make_blame_repo.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -eu -o pipefail
 
+git config --local diff.algorithm histogram
+
 git init -q
 git config merge.ff false
 
@@ -98,6 +100,11 @@ echo -e "line 1\nline 2 changed a second time" > same-line-changed-twice.txt
 git add same-line-changed-twice.txt
 git commit -q -m c4.4
 
+echo -e "  line 1\n\n  line 2\n\n  line 3" > empty-lines-histogram.txt
+cp empty-lines-histogram.txt empty-lines-myers.txt
+git add empty-lines-histogram.txt empty-lines-myers.txt
+git commit -q -m c4.5
+
 echo -e "line 0\nline 1\nline 2" > added-lines.txt
 echo -e "line 0\nline 1\nline 2\nline 3" > added-lines-around.txt
 git add added-lines.txt
@@ -116,6 +123,11 @@ echo -e "line 1\nline 2 changed\nline 3" > added-line-before-changed-line.txt
 git add added-line-before-changed-line.txt
 git commit -q -m c5.3
 
+echo -e "  line 1\n\n  line in between\n\n  line 2\n\n  line in between\n\n  line 3" > empty-lines-histogram.txt
+cp empty-lines-histogram.txt empty-lines-myers.txt
+git add empty-lines-histogram.txt empty-lines-myers.txt
+git commit -q -m c5.4
+
 git blame --porcelain simple.txt > .git/simple.baseline
 git blame --porcelain multiline-hunks.txt > .git/multiline-hunks.baseline
 git blame --porcelain deleted-lines.txt > .git/deleted-lines.baseline
@@ -128,3 +140,9 @@ git blame --porcelain switched-lines.txt > .git/switched-lines.baseline
 git blame --porcelain added-line-before-changed-line.txt > .git/added-line-before-changed-line.baseline
 git blame --porcelain same-line-changed-twice.txt > .git/same-line-changed-twice.baseline
 git blame --porcelain coalesce-adjacent-hunks.txt > .git/coalesce-adjacent-hunks.baseline
+
+git blame --porcelain empty-lines-histogram.txt > .git/empty-lines-histogram.baseline
+
+git config --local diff.algorithm myers
+
+git blame --porcelain empty-lines-myers.txt > .git/empty-lines-myers.baseline