add-patch: test for 'p' command

Add a test for the 'p' command, which was introduced in 66c14ab
(add-patch: introduce 'p' in interactive-patch, 2024-03-29).

Signed-off-by: Rubén Justo <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rjusto

t/t3701-add-interactive.sh

@@ -575,6 +575,22 @@ test_expect_success 'navigate to hunk via regex / pattern' '
 	test_cmp expect actual.trimmed
 '
 
+test_expect_success 'print again the hunk' '
+	test_when_finished "git reset" &&
+	tr _ " " >expect <<-EOF &&
+	+15
+	 20
+	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]? @@ -1,2 +1,3 @@
+	 10
+	+15
+	 20
+	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]?_
+	EOF
+	test_write_lines s y g 1 p | git add -p >actual &&
+	tail -n 7 <actual >actual.trimmed &&
+	test_cmp expect actual.trimmed
+'
+
 test_expect_success 'split hunk "add -p (edit)"' '
 	# Split, say Edit and do nothing.  Then:
 	#