Debug: Run tests with 1 single test thread

Author: qinsoon

.github/scripts/ci-test.sh

@@ -4,6 +4,9 @@ export RUST_BACKTRACE=1
 # Run all tests with 1G heap
 export MMTK_GC_TRIGGER=FixedHeapSize:1000000000
 
+# To debug
+export RUST_TEST_THREADS=1
+
 for_all_features "cargo test"
 
 # target-specific features

.github/workflows/minimal-tests-core.yml

@@ -63,6 +63,9 @@ jobs:
       # Test
       - name: Test
         run: ./.github/scripts/ci-test.sh
+      - name: Setup tmate session
+        if: ${{ failure() }}
+        uses: mxschmitt/action-tmate@v3
 
       # Style checks
       - name: Style checks