diff --git a/lib/dns/tests/testdata/diff/zone1.data b/lib/dns/tests/testdata/diff/zone1.data
new file mode 100644
index 0000000000..ed4842ee04
--- /dev/null
+++ b/lib/dns/tests/testdata/diff/zone1.data
@@ -0,0 +1,4 @@
+@ 	0	SOA . . 0 0 0 0 0
+@	0	NS @
+@	0	A 1.2.3.4
+remove	0	A 5.6.7.8
diff --git a/lib/dns/tests/testdata/diff/zone2.data b/lib/dns/tests/testdata/diff/zone2.data
new file mode 100644
index 0000000000..8349d606e3
--- /dev/null
+++ b/lib/dns/tests/testdata/diff/zone2.data
@@ -0,0 +1,5 @@
+@ 	0	SOA . . 0 0 0 0 0
+@	0	NS @
+@	0	A 1.2.3.4
+remove	0	A 5.6.7.8
+added	0	A 5.6.7.8
diff --git a/lib/dns/tests/testdata/diff/zone3.data b/lib/dns/tests/testdata/diff/zone3.data
new file mode 100644
index 0000000000..8ed7a4b3f7
--- /dev/null
+++ b/lib/dns/tests/testdata/diff/zone3.data
@@ -0,0 +1,3 @@
+@ 	0	SOA . . 0 0 0 0 0
+@	0	NS @
+@	0	A 1.2.3.4