sqldb: add validate-network unit tests

Author: ziggie1984

sqldb/validate_network_test.go

@@ -0,0 +1,25 @@
+//go:build test_db_postgres || test_db_sqlite
+
+package sqldb
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+const networkMismatchErr = "database network mismatch"
+
+// TestValidateNetworkMismatch verifies that ValidateNetwork persists the first
+// network and fails when a different network is used later.
+func TestValidateNetworkMismatch(t *testing.T) {
+	t.Parallel()
+
+	db := NewTestDB(t)
+
+	err := db.ValidateNetwork(t.Context(), "regtest")
+	require.NoError(t, err)
+
+	err = db.ValidateNetwork(t.Context(), "simnet")
+	require.ErrorContains(t, err, networkMismatchErr)
+}