i have this scenario,

interface IExample {
  id: ID! 
  main: Main!
  num: Int!
}

type Example1 implements IExample @entity {
  id: ID! 
  main: Main!
  num: Int!

  num2: Int
}

type Main @entity {
  id: ID!
  examples: [IExample!]! @derivedFrom(field: "main")
}

but in my testing, when i create Main and Example1
there relationship via IExample will not show up in logStore()
however when deployed it is all good

i wanted to test something like
assert.i32Equals(mainEntity.examples.length, 1);

but i don't know how to properly test this