Backport of eosio-tester to 2.0.x

[tbfleming]

This is to support unit and integration testing for the Eden contract, and as a potential tool for testing other projects.

eosio-tester Overview

eosio-tester runs non-contract WASM files which drive testing. It gives those WASM files access to the local system, similar to what a scripting environment does, but also gives them the following abilities:

• Create, stop, start, and clone chains, including running several at once, all running in a single fully-synchronous process. This does not interfere with any running nodeos instances. (striked-out features aren't currently present, but can be added)
• Push transactions to these chains and get results back.
• Full control over timing. If a test needs a set of transactions to be in a specific block and in a specific order, it can do it. If a test needs to jump to a specific block several years in the future, it can do it.
• Include contract code directly in the test wasm. This simplifies pushing transactions, reading tables, and even calling individual functions from the contract's source without having to go through a transaction.

Where lives

There are 3 parts to this:

• A back port of required chainlib features plus additional enhancements to 2.0.x. Current progress lives in https://github.com/eoscommunity/eos/tree/backport
• eden-tester: This is a backport of eosio-tester, but with additional changes. It lives in https://github.com/eoscommunity/Eden/tree/main/programs/cltester and pulls in chainlib as a submodule.
• Support library. This lives in https://github.com/eoscommunity/Eden/tree/main/libraries/eosiolib/tester

[tbfleming]

Alpha release is available. See https://github.com/eoscommunity/demo-clsdk .