)
'
+
+test_expect_success 'fast-export --first-parent outputs all revisions output by revision walk' '
+ git init first-parent &&
+ (
+ cd first-parent &&
+ test_commit A &&
+ git checkout -b topic1 &&
+ test_commit B &&
+ git checkout main &&
+ git merge --no-ff topic1 &&
+
+ git checkout -b topic2 &&
+ test_commit C &&
+ git checkout main &&
+ git merge --no-ff topic2 &&
+
+ test_commit D &&
+
+ git fast-export main -- --first-parent >first-parent-export &&
+ git fast-export main -- --first-parent --reverse >first-parent-reverse-export &&
+ test_cmp first-parent-export first-parent-reverse-export &&
+
+ git init import &&
+ git -C import fast-import <first-parent-export &&
+
+ git log --format="%ad %s" --first-parent main >expected &&
+ git -C import log --format="%ad %s" --all >actual &&
+ test_cmp expected actual &&
+ test_line_count = 4 actual
+ )
+'
+
test_done