feat(tests): Move the RPC tests framework from zcashd

[oxarbitrage]

Motivation

We want to integrate zcashd's RPC test framework with Zebra to ensure compatibility. To achieve this, we are migrating the framework and tests from zcashd to Zebra. Each test migration requires specific changes to Zebra, and this PR begins the process by moving the test framework and a few initial test.

This PR addresses parts of #8779 and #8781

Solution

This PR do the the groundwork for the migration, but it is not the complete solution.

• README was copied from https://github.com/zcash/zcash/blob/master/qa/README.md and updated.
• The RPC test runner script, rpc-tests.py, was copied and modified where necessary to adapt it for Zebra. This script runs with every pull request in zcashd’s CI.
• The rpc-tests framework directory was migrated, though most files remain unchanged. The following modifications were made:
  • Updated the util.py file as required.
  • Introduced a new proxy.py file, based on authproxy.py, with authentication removed.
• The getmininginfo.py test was moved without modification, as the first test in this migration.
• The reindex test was moved with modifications, to match zebrad sync behavior.
• create_cache was moved so the new framework can create a cache state to speed up tests.

Tests

Run the framework:

 ./qa/pull-tester/rpc-tests.py

Individual tests:

./qa/pull-tester/rpc-tests.py getmininginfo

Direct:

./qa/rpc-tests/getmininginfo.py

Follow-up Work

PR Author's Checklist

• The PR name will make sense to users.
• The PR provides a CHANGELOG summary.
• The solution is tested.
• The documentation is up to date.
• The PR has a priority label.

PR Reviewer's Checklist

• The PR Author's checklist is complete.
• The PR resolves the issue.

[oxarbitrage]

A lot of the files in this PR are moved from zcashd unmodified, almost everything inside qa/rpc-tests/test-framework was not modified. I made a small script so reviewers can check the files were moved untouched. It checks the differences between several files in zcashd and the files in this PR:

#!/bin/bash

# Array of files to compare
files=("__init__.py" "authproxy.py" "bignum.py" "blockstore.py" "blocktools.py" "compool.py" "coverage.py" "equihash.py" "flyclient.py" "key.py" "mininode.py" "netutil.py" "script.py" "script.py" "socks5.py" "test_framework.py" "util.py" "zip244.py" "zip317.py")

# Base URLs for Zebra and Zcash
zebra_base="https://github.com/raw/ZcashFoundation/zebra/bb98b559634db822a9a10041e03acb3580688505/zebra-rpc/qa/rpc-tests/test_framework/"
zcash_base="https://github.com/raw/zcash/zcash/master/qa/rpc-tests/test_framework/"

# Loop through the files array
for file in "${files[@]}"; do
    echo "Comparing $file"
    diff --color <(curl "${zebra_base}${file}" -s) <(curl "${zcash_base}${file}" -s)
done

That covers 19 of the files added in this PR.

Then, the proxy file, which is new, can be compared locally with the authproxy one as follows:

diff --color <(curl https://github.com/raw/ZcashFoundation/zebra/bb98b559634db822a9a10041e03acb3580688505/zebra-rpc/qa/rpc-tests/test_framework/proxy.py -s) <(curl https://github.com/raw/ZcashFoundation/zebra/bb98b559634db822a9a10041e03acb3580688505/zebra-rpc/qa/rpc-tests/test_framework/authproxy.py -s)

The only test moved can be compared with the one in zcashd as follows (no changes were done there, so the diff is empty):

diff --color <(curl https://github.com/raw/ZcashFoundation/zebra/bb98b559634db822a9a10041e03acb3580688505/zebra-rpc/qa/rpc-tests/getmininginfo.py -s) <(curl https://github.com/raw/zcash/zcash/master/qa/rpc-tests/getmininginfo.py -s)