trait TestDynamoDBExecutor extends AnyRef

A Fake implementation of DynamoDBExecutor.Service that currently has the very modest aspiration of providing bare minimum functionality to enable internal unit tests and to enable simple end to end examples that can serve as documentation. Limited CRUD functionality is supported hence some features are currently not supported or have restrictions.

  • Supported
    • CRUD operations GetItem, PutItem, DeleteItem, BatchGetItem, BatchWriteItem
  • Limited support
    • Primary Keys - only the partition key can be specified and is only checked for equality
  • Not currently supported
    • Projections - all fields are returned for all queries
    • Expressions - these include KeyConditionExpression's, ConditionExpression's, ProjectionExpression's, UpdateExpression's
    • Create table, Delete table
    • UpdateItem - this is a more complex case as it uses an expression to specify the update
    • Indexes in ScanSome, ScanAll, QuerySome, QueryAll

Usage: DynamoDBExecutor.test provides you the test DB instance in a ZLayer. Tables are created using the addTable method in the test controller service TestDynamoDBExecutor. You specify a table, a single primary and a var arg list of primary key/item pairs.

testM("getItem") {
  for {
    _ <- TestDynamoDBExecutor.addTable("tableName1", primaryKeyFieldName = "k1", primaryKey1 -> item1, primaryKey1_2 -> item1_2)
    result  <- GetItem(key = primaryKey1, tableName = tableName1).execute
    expected = Some(item1)
  } yield assert(result)(equalTo(expected))
}.provideLayer(DynamoDBExecutor.test)
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  1. abstract def addItems(tableName: String, pkAndItems: PkAndItem*): ZIO[Any, DatabaseError, Unit]
  2. abstract def addTable(tableName: String, pkFieldName: String, pkAndItems: PkAndItem*): UIO[Unit]

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