autopkgtests: provide t-apply-diff

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/lib b/tests/lib
index 94c4c79..fb6059b 100644
--- a/tests/lib
+++ b/tests/lib
@@ -158,3 +158,10 @@ t-ref-dsc-dgit () {
 		print $ref,"\n";
 	' <$tmp/incoming/${p}_${v}.dsc >$tmp/t.ref1
 }
+
+t-apply-diff () {
+	local v1=$1
+	local v2=$2
+	(cd $troot/pkg-srcs; debdiff ${p}_${v1}.dsc ${p}_${v2}.dsc) \
+		| patch -p1 -u
+}