add swiftUI code

iOS-SwiftUI-Code/GRDB.swift-6.29.3/Tests/GRDBTests/DatabaseQueueBackupTests.swift

@@ -0,0 +1,17 @@
+import GRDB
+
+class DatabaseQueueBackupTests: BackupTestCase {
+    
+    func testDatabaseWriterBackup() throws {
+        // SQLCipher can't backup encrypted databases: use a pristine Configuration
+        let source = try makeDatabaseQueue(filename: "source.sqlite", configuration: Configuration())
+        let destination = try makeDatabaseQueue(filename: "destination.sqlite", configuration: Configuration())
+        try testDatabaseWriterBackup(from: source, to: destination)
+    }
+    
+    func testDatabaseBackup() throws {
+        let source = try makeDatabaseQueue(filename: "source.sqlite", configuration: Configuration())
+        let destination = try makeDatabaseQueue(filename: "destination.sqlite", configuration: Configuration())
+        try testDatabaseBackup(from: source, to: destination)
+    }
+}