fix(plugin/secondary): make transfer property mandatory (#7249)

* fix(plugin/secondary): make transfer property mandatory

Signed-off-by: wafuwafu13 <jaruwafu@gmail.com>

plugin/secondary/setup_test.go

@@ -13,12 +13,6 @@ func TestSecondaryParse(t *testing.T) {
 		transferFrom   string
 		zones          []string
 	}{
-		{
-			`secondary`,
-			false, // TODO(miek): should actually be true, because without transfer lines this does not make sense
-			"",
-			nil,
-		},
 		{
 			`secondary {
 				transfer from 127.0.0.1
@@ -35,6 +29,20 @@ func TestSecondaryParse(t *testing.T) {
 			"127.0.0.1:53",
 			[]string{"example.org."},
 		},
+		{
+			`secondary`,
+			true,
+			"",
+			nil,
+		},
+		{
+			`secondary example.org {
+				transferr from 127.0.0.1
+			}`,
+			true,
+			"",
+			nil,
+		},
 	}
 
 	for i, test := range tests {