fix validation tests

Author: tanner0101

Diff for: .gitignore

@@ -4,3 +4,5 @@
 /*.xcodeproj
 Package.pins
 Package.resolved
+DerivedData
+

Diff for: Tests/ValidationTests/ValidationTests.swift

@@ -10,7 +10,7 @@ class ValidationTests: XCTestCase {
         try user.validate()
         try user.pet.validate()
 
-        let secondUser = User(name: "Natan", age: 30, pet: Pet(name: "Nina", age: 4))
+        let secondUser = User(name: "Natan", age: 30, pet: Pet(name: "Nina", age: 4), preferedColors: ["pink"])
         secondUser.profilePictureURL = "https://www.somedomain.com/somePath.png"
         secondUser.email = "[email protected]"
         try secondUser.validate()