feat: Begins live database client tests.

Tests/DatabaseClientTests/Helpers.swift

@@ -0,0 +1,39 @@
+import App
+import DatabaseClient
+import Dependencies
+import Fluent
+import FluentSQLiteDriver
+import Foundation
+import NIO
+import Vapor
+
+// Helper to create an in-memory database for testing.
+func withDatabase(
+  setupDependencies: (inout DependencyValues) -> Void = { _ in },
+  operation: () async throws -> Void
+) async throws {
+  let app = try await Application.make(.testing)
+  do {
+    try await configure(app)
+    let database = app.db
+    try await app.autoMigrate()
+
+    try await withDependencies {
+      $0.uuid = .incrementing
+      $0.date = .init { Date() }
+      $0.database = .live(database: database)
+      setupDependencies(&$0)
+    } operation: {
+      try await operation()
+    }
+
+    try await app.autoRevert()
+    try await app.asyncShutdown()
+
+  } catch {
+    try? await app.autoRevert()
+    try await app.asyncShutdown()
+    throw error
+  }
+
+}