diff --git a/core/stores/cache/util_test.go b/core/stores/cache/util_test.go
new file mode 100644
index 00000000..95e48b62
--- /dev/null
+++ b/core/stores/cache/util_test.go
@@ -0,0 +1,26 @@
+package cache
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFormatKeys(t *testing.T) {
+	assert.Equal(t, "a,b", formatKeys([]string{"a", "b"}))
+}
+
+func TestTotalWeights(t *testing.T) {
+	val := TotalWeights([]NodeConf{
+		{
+			Weight: -1,
+		},
+		{
+			Weight: 0,
+		},
+		{
+			Weight: 1,
+		},
+	})
+	assert.Equal(t, 1, val)
+}