port tests from neostake

Cargo.toml

@@ -75,6 +75,7 @@ members = [
     "programs/ed25519-tests",
     "programs/loader-v4",
     "programs/stake",
+    "programs/stake-tests",
     "programs/system",
     "programs/vote",
     "programs/zk-elgamal-proof",

programs/stake-tests/Cargo.toml

@@ -0,0 +1,26 @@
+# This package only exists to avoid circular dependencies during cargo publish:
+# solana-program-test <--> solana-stake-program
+
+[package]
+name = "solana-stake-program-tests"
+publish = false
+version = { workspace = true }
+authors = { workspace = true }
+repository = { workspace = true }
+homepage = { workspace = true }
+license = { workspace = true }
+edition = { workspace = true }
+
+[dev-dependencies]
+assert_matches = { workspace = true }
+bincode = { workspace = true }
+solana-program-test = { workspace = true }
+solana-sdk = { workspace = true }
+solana-vote-program = { workspace = true }
+test-case = { workspace = true }
+
+[build-dependencies]
+rustc_version = { workspace = true }
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]