add key path tests

Author: tanner0101

Tests/FluentPostgreSQLTests/FluentPostgreSQLTests.swift

@@ -44,10 +44,14 @@ class FluentPostgreSQLTests: XCTestCase {
 
     func testNestedStruct() throws {
         let conn = try! database.makeConnection(using: .init(), on: eventLoop).await(on: eventLoop)
+        print(User.codingPath(forKey: \.favoriteColors))
+        print(User.properties())
         try! User.prepare(on: conn).await(on: eventLoop)
 
+
         let user = try! User(id: nil, name: "Tanner", pet: Pet(name: "Zizek"))
-            .save(on: conn).await(on: eventLoop)
+        user.favoriteColors = ["pink", "blue"]
+        _ = try! user.save(on: conn).await(on: eventLoop)
 
         let fetched = try! User.query(on: conn).first().await(on: eventLoop)
 
@@ -76,9 +80,11 @@ final class User: PostgreSQLModel, Migration {
     var id: Int?
     var name: String
     var age: Int?
+    var favoriteColors: [String]
     var pet: Pet
 
     init(id: Int? = nil, name: String, pet: Pet) {
+        self.favoriteColors = []
         self.id = id
         self.name = name
         self.pet = pet