Improve checkout cores test (fails by default)

[cryptonemo]

Description

The checkout cores test always fails when the tests are run, by default, in parallel. Some options to fix it are to require tests be run in a single threaded manner (not generally practical due to extended wait times during development cycles), or to use a feature such as "single-threaded = []" and making the test conditionally compiled for when it's specified. We could add a CI job for this single test configuration, but also have the option to run it locally if required.

Acceptance criteria

All tests run need to pass.

Where to begin

Proposed diff:

diff --git a/storage-proofs/porep/Cargo.toml b/storage-proofs/porep/Cargo.toml
index d0957a6e..a8ff857d 100644
--- a/storage-proofs/porep/Cargo.toml
+++ b/storage-proofs/porep/Cargo.toml
@@ -53,6 +53,7 @@ default = ["pairing", "gpu"]
 gpu = ["storage-proofs-core/gpu", "filecoin-hashers/gpu"]
 pairing = ["storage-proofs-core/pairing", "bellperson/pairing", "neptune/pairing", "filecoin-hashers/pairing"]
 blst = ["storage-proofs-core/blst", "bellperson/blst", "neptune/blst", "filecoin-hashers/blst"]
+single-threaded = []
 
 [[bench]]
 name = "encode"
diff --git a/storage-proofs/porep/src/stacked/vanilla/cores.rs b/storage-proofs/porep/src/stacked/vanilla/cores.rs
index 2aed3d47..cc7abcfa 100644
--- a/storage-proofs/porep/src/stacked/vanilla/cores.rs
+++ b/storage-proofs/porep/src/stacked/vanilla/cores.rs
@@ -201,6 +201,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(feature="single-threaded")]
     fn test_checkout_cores() {
         let checkout1 = checkout_core_group();
         dbg!(&checkout1);

[cryptonemo]

Resolved with #1383