stellar-core: enable focused test smoke checks

pkgs/by-name/st/stellar-core/package.nix

@@ -10,6 +10,8 @@
   libtool,
   libunwind,
   perl,
+  postgresql,
+  postgresqlTestHook,
   pkg-config,
   ripgrep,
   rustc,
@@ -113,6 +115,11 @@ stdenv.mkDerivation (finalAttrs: {
     rustPlatform.cargoSetupHook
   ];
 
+  nativeCheckInputs = [
+    postgresql
+    postgresqlTestHook
+  ];
+
   buildInputs = [
     libpq
     libunwind
@@ -120,6 +127,16 @@ stdenv.mkDerivation (finalAttrs: {
 
   enableParallelBuilding = true;
 
+  doCheck = true;
+
+  postgresqlTestUserOptions = "LOGIN CREATEDB";
+
+  postgresqlTestSetupPost = ''
+    for database in $(seq 0 15); do
+      createdb "test$database"
+    done
+  '';
+
   preConfigure = ''
     # Due to https://github.com/NixOS/nixpkgs/issues/8567 we cannot rely on
     # having the .git directory present, so directly provide the version
@@ -142,6 +159,19 @@ stdenv.mkDerivation (finalAttrs: {
     ./autogen.sh
   '';
 
+  checkPhase = ''
+    runHook preCheck
+
+    # The full upstream test suite is too heavy for a default package check: it
+    # includes long-running integration scenarios and Soroban tests across all
+    # p21-p26 protocol crates. Keep this focused on a basic consensus smoke test
+    # plus a PostgreSQL-backed persistence test.
+    ./src/stellar-core test --ll fatal -w NoTests -a -r simple --disable-dots "standalone"
+    ./src/stellar-core test --ll fatal -w NoTests -a -r simple --disable-dots "SCP State"
+
+    runHook postCheck
+  '';
+
   meta = {
     description = "Reference peer-to-peer agent that manages the Stellar network";
     longDescription = ''