feat(test): roll a custom TestEnv and drop lazy_static

Implement a custom `TestEnv`, which is instantiated per-test and
fixes the un-dropped `bitcoind` issue. This also allows running
tests with more than 1 thread, since they no longer share `bitcoind`
and `electrsd` instances.

Also adds helpers to fetch externally sourced addresses, fixing
the issue where `bitcoind`'s wallet would send change outputs to
it's own wallet address, which would mess with `test_get_scripthash_stats`.

The `test` recipe and CI job are updated to now use 16 threads.

Author: luisschwab

.github/workflows/cont_integration.yml

@@ -53,7 +53,7 @@ jobs:
     - name: Build
       run: cargo build --features ${{ matrix.features }} --no-default-features
     - name: Test
-      run: cargo test --features ${{ matrix.features }} --no-default-features -- --test-threads=1
+      run: cargo test --features ${{ matrix.features }} --no-default-features -- --test-threads=16
 
   fmt:
     name: Rust Formatting

Cargo.toml

@@ -34,7 +34,6 @@ tokio = { version = "1", features = ["time"], optional = true }
 [dev-dependencies]
 tokio = { version = "1.20.1", features = ["full"] }
 electrsd = { version = "0.36.1", features = ["legacy", "esplora_a33e97e1", "corepc-node_29_0"] }
-lazy_static = "1.4.0"
 
 [features]
 default = ["blocking", "async", "async-https", "tokio"]

justfile

@@ -31,11 +31,11 @@ msrv:
    rm -rf Cargo.lock
    bash ci/pin-msrv.sh
    cargo +1.75.0 build --all-features
-   cargo +1.75.0 test --all-features -- --test-threads=1
+   cargo +1.75.0 test --all-features -- --test-threads=16
 
 # Run pre-push suite: format, check, and test
 pre-push: fmt check test msrv
 
 # Run all tests on the workspace with all features
 test:
-   cargo test --all-features -- --test-threads=1
+   cargo test --all-features -- --test-threads=16