Put expensive tests behind an additional `expensive-tests` feature flag.

.github/workflows/ci.yml

@@ -72,6 +72,7 @@ jobs:
           --release
           --workspace
           ${{ steps.prepare.outputs.feature-flags }}
+          --features expensive-tests
           -- --ignored
       - name: Verify working directory is clean
         run: git diff --exit-code

zcash_client_sqlite/Cargo.toml

@@ -127,5 +127,8 @@ transparent-inputs = [
 ## Exposes unstable APIs. Their behaviour may change at any time.
 unstable = ["zcash_client_backend/unstable"]
 
+## A feature used to isolate tests that are expensive to run. Test-only.
+expensive-tests = []
+
 [lib]
 bench = false

zcash_client_sqlite/src/wallet/orchard.rs

@@ -597,6 +597,7 @@ pub(crate) mod tests {
 
     #[test]
     #[ignore] // FIXME: #1316 This requires support for dust outputs.
+    #[cfg(not(feature = "expensive-tests"))]
     fn zip317_spend() {
         testing::pool::zip317_spend::<OrchardPoolTester>()
     }

zcash_client_sqlite/src/wallet/sapling.rs

@@ -603,6 +603,7 @@ pub(crate) mod tests {
 
     #[test]
     #[ignore] // FIXME: #1316 This requires support for dust outputs.
+    #[cfg(not(feature = "expensive-tests"))]
     fn zip317_spend() {
         testing::pool::zip317_spend::<SaplingPoolTester>()
     }

zcash_primitives/Cargo.toml

@@ -123,6 +123,9 @@ test-dependencies = [
     "zcash_protocol/test-dependencies",
 ]
 
+## A feature used to isolate tests that are expensive to run. Test-only.
+expensive-tests = []
+
 [lib]
 bench = false
 

zcash_primitives/src/transaction/tests.rs

@@ -62,6 +62,7 @@ fn check_roundtrip(tx: Transaction) -> Result<(), TestCaseError> {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_sprout(tx in arb_tx(BranchId::Sprout)) {
         check_roundtrip(tx)?;
     }
@@ -70,6 +71,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_overwinter(tx in arb_tx(BranchId::Overwinter)) {
         check_roundtrip(tx)?;
     }
@@ -78,6 +80,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_sapling(tx in arb_tx(BranchId::Sapling)) {
         check_roundtrip(tx)?;
     }
@@ -86,6 +89,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_blossom(tx in arb_tx(BranchId::Blossom)) {
         check_roundtrip(tx)?;
     }
@@ -94,6 +98,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_heartwood(tx in arb_tx(BranchId::Heartwood)) {
         check_roundtrip(tx)?;
     }
@@ -119,6 +124,7 @@ proptest! {
 proptest! {
     #[test]
     #[ignore]
+    #[cfg(feature = "expensive-tests")]
     fn tx_serialization_roundtrip_future(tx in arb_tx(BranchId::ZFuture)) {
         check_roundtrip(tx)?;
     }

zcash_proofs/Cargo.toml

@@ -67,6 +67,9 @@ local-prover = ["directories"]
 ## Enables multithreading support for creating proofs.
 multicore = ["bellman/multicore", "zcash_primitives/multicore"]
 
+## A feature used to isolate tests that are expensive to run. Test-only.
+expensive-tests = []
+
 [lib]
 bench = false
 

zcash_proofs/src/circuit/sprout/mod.rs

@@ -335,6 +335,7 @@ where
 
 #[test]
 #[ignore]
+#[cfg(feature = "expensive-tests")]
 fn test_sprout_constraints() {
     use bellman::gadgets::test::*;
     use bls12_381::Scalar;