Errors with Jest: Missing field 'parents' while writing result

[dandean]

When I use ApolloTestingModule and flush data, angular-apollo writes a bunch of console.error messages which look like this:

  console.error
    Missing field 'parents' while writing result {
      "__typename": "VideoAsset",
      ........
    }

      at Function.error (../../../node_modules/ts-invariant/lib/invariant.esm.js:35:27)
      at ../../../node_modules/@apollo/client/cache/inmemory/writeToStore.js:149:42
          at Set.forEach (<anonymous>)
      at StoreWriter.Object.<anonymous>.StoreWriter.processSelectionSet (../../../node_modules/@apollo/client/cache/inmemory/writeToStore.js:105:20)
      at StoreWriter.Object.<anonymous>.StoreWriter.processFieldValue (../../../node_modules/@apollo/client/cache/inmemory/writeToStore.js:192:21)
      at ../../../node_modules/@apollo/client/cache/inmemory/writeToStore.js:187:35
          at Array.map (<anonymous>)

The field parents is just an example here, console.error messages are printed for a number of different fields. The data being flushed does not contain the fields in question, but those fields are also nullable fields in the schema, so they should not be required.

What is the correct way to stop apollo-angular from logging these messages?