multi: add new config option BudgetConfig and NoDeadlineConfTarget

This commit adds a new group config `BudgetConfig` to allow users
specifying their own preference when sweeping outputs. And a new config
option `NoDeadlineConfTarget` is added in case the user wants to use a
different "lazy" conf target.

contractcourt/config_test.go

@@ -0,0 +1,83 @@
+package contractcourt
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestBudgetConfigValidate checks that the budget config validation works as
+// expected.
+func TestBudgetConfigValidate(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name           string
+		cfg            *BudgetConfig
+		expectedErrStr string
+	}{
+		{
+			name: "valid config",
+			cfg:  DefaultBudgetConfig(),
+		},
+		{
+			name:           "nil config",
+			cfg:            nil,
+			expectedErrStr: "no budget config set",
+		},
+		{
+			name:           "invalid tolocal",
+			cfg:            &BudgetConfig{ToLocal: -1},
+			expectedErrStr: "tolocal",
+		},
+		{
+			name:           "invalid tolocalratio",
+			cfg:            &BudgetConfig{ToLocalRatio: -1},
+			expectedErrStr: "tolocalratio",
+		},
+		{
+			name:           "invalid anchorcpfp",
+			cfg:            &BudgetConfig{AnchorCPFP: -1},
+			expectedErrStr: "anchorcpfp",
+		},
+		{
+			name:           "invalid anchorcpfpratio",
+			cfg:            &BudgetConfig{AnchorCPFPRatio: -1},
+			expectedErrStr: "anchorcpfpratio",
+		},
+		{
+			name:           "invalid deadlinehtlc",
+			cfg:            &BudgetConfig{DeadlineHTLC: -1},
+			expectedErrStr: "deadlinehtlc",
+		},
+		{
+			name:           "invalid deadlinehtlcratio",
+			cfg:            &BudgetConfig{DeadlineHTLCRatio: -1},
+			expectedErrStr: "deadlinehtlcratio",
+		},
+
+		{
+			name:           "invalid nodeadlinehtlc",
+			cfg:            &BudgetConfig{NoDeadlineHTLC: -1},
+			expectedErrStr: "nodeadlinehtlc",
+		},
+		{
+			name:           "invalid nodeadlinehtlcratio",
+			cfg:            &BudgetConfig{NoDeadlineHTLCRatio: -1},
+			expectedErrStr: "nodeadlinehtlcratio",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.cfg.Validate()
+
+			if tc.expectedErrStr == "" {
+				require.NoError(t, err)
+				return
+			}
+
+			require.ErrorContains(t, err, tc.expectedErrStr)
+		})
+	}
+}