cli: add tests to cli packages

Closes #1336

cli/flags/util_test.go

@@ -0,0 +1,17 @@
+package flags
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEachName(t *testing.T) {
+	expected := "*one*two*three"
+	actual := ""
+
+	eachName(" one,two ,three", func(s string) {
+		actual += "*" + s
+	})
+	require.Equal(t, expected, actual)
+}