internal/controld: add support for parsing client id from raw UID

internal/controld/controld_test.go

@@ -0,0 +1,34 @@
+//go:build controld
+
+package controld
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFetchResolverConfig(t *testing.T) {
+	tests := []struct {
+		name    string
+		uid     string
+		dev     bool
+		wantErr bool
+	}{
+		{"valid com", "p2", false, false},
+		{"valid dev", "p2", true, false},
+		{"invalid uid", "abcd1234", false, true},
+	}
+	for _, tc := range tests {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			got, err := FetchResolverConfig(tc.uid, "dev-test", tc.dev)
+			require.False(t, (err != nil) != tc.wantErr, err)
+			if !tc.wantErr {
+				assert.NotEmpty(t, got.DOH)
+			}
+		})
+	}
+}