InMemoryNormalizedCache.swift

@testable import Apollo
final class InMemoryNormalizedCache: NormalizedCache {
    private var records: RecordSet

    init(records: RecordSet = RecordSet()) {
        self.records = records
    }

    func loadRecords(forKeys keys: [CacheKey]) -> Promise<[Record?]> {
        let records = keys.map { self.records[$0] }
        return Promise(fulfilled: records)
    }

    func merge(records: RecordSet) -> Promise> {
        return Promise(fulfilled: self.records.merge(records: records))
    }

    func clear() -> Promise {
        records.clear()
        return Promise(fulfilled: ())
    }
}