diff --git a/link_test.go b/link_test.go
deleted file mode 100644
index b8a407a..0000000
--- a/link_test.go
+++ /dev/null
@@ -1 +0,0 @@
-package incr
diff --git a/list_util.go b/list_util.go
index c5ac573..f4d51b9 100644
--- a/list_util.go
+++ b/list_util.go
@@ -9,17 +9,3 @@ func remove[A INode](nodes []A, id Identifier) []A {
 	}
 	return output
 }
-
-func hasKey[A INode](nodes []A, id Identifier) bool {
-	for _, n := range nodes {
-		if n.Node().id == id {
-			return true
-		}
-	}
-	return false
-}
-
-func mapHasKey[K comparable, V any](m map[K]V, k K) (ok bool) {
-	_, ok = m[k]
-	return
-}
diff --git a/main_test.go b/main_test.go
index 55ab6bf..810c11e 100644
--- a/main_test.go
+++ b/main_test.go
@@ -249,3 +249,17 @@ func dumpDot(g *Graph, path string) error {
 	}
 	return nil
 }
+
+func hasKey[A INode](nodes []A, id Identifier) bool {
+	for _, n := range nodes {
+		if n.Node().id == id {
+			return true
+		}
+	}
+	return false
+}
+
+func mapHasKey[K comparable, V any](m map[K]V, k K) (ok bool) {
+	_, ok = m[k]
+	return
+}