diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 510719d..896e8c7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,8 +13,9 @@ jobs:
     strategy:
       matrix:
         julia-version: ['~1.7.0-beta4', 'nightly']
+        nthreads: ['1', '2']
       fail-fast: false
-    name: Test Julia ${{ matrix.julia-version }}
+    name: Test Julia ${{ matrix.julia-version }} nthreads=${{ matrix.nthreads }}
     steps:
       - uses: actions/checkout@v2
       - name: Setup julia
@@ -24,6 +25,8 @@ jobs:
       # Use `JULIA_PKG_SERVER` mitigation implemented in julia-buildpkg:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
+        env:
+          JULIA_NUM_THREADS: ${{ matrix.nthreads }}
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
         with:
diff --git a/test/runtests.jl b/test/runtests.jl
index 3fcfe0b..5d5c7d1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -3,6 +3,8 @@ using Test
 
 include("load.jl")
 
+@info "Starting test" Threads.nthreads()
+
 @testset "$file" for file in sort([
     file for file in readdir(@__DIR__) if match(r"^test_.*\.jl$", file) !== nothing
 ])