diff --git a/.github/workflows/ci-debug-macos-arm64.yml b/.github/workflows/ci-debug-macos-arm64.yml
new file mode 100644
index 0000000000..932438b93b
--- /dev/null
+++ b/.github/workflows/ci-debug-macos-arm64.yml
@@ -0,0 +1,147 @@
+name: Build and Test moebius on macOS arm64
+
+on:
+  workflow_dispatch:
+    inputs:
+      commit:
+        description: 'Commit SHA to build/test'
+        required: true
+        type: string
+
+  push:
+    branches: [ main ]
+    paths:
+      - 'src/**'
+      - '!src/Plugins/Windows/**'
+      - 'tests/**'
+      - 'xmake.lua'
+      - 'xmake/packages.lua'
+      - 'xmake/research.lua'
+      - 'xmake/options.lua'
+      - 'xmake/requires.lua'
+      - 'xmake/targets/**'
+      - 'xmake/packages/**'
+      - 'xmake-requires.lock'
+      - 'lolly/Data/**'
+      - 'lolly/Kernel/**'
+      - 'lolly/Plugins/**'
+      - 'lolly/System/**'
+      - 'lolly/lolly/**'
+      - 'lolly/tests/**'
+      - 'lolly/xmake.lua'
+      - 'moebius/Data/**'
+      - 'moebius/Kernel/**'
+      - 'moebius/Scheme/**'
+      - 'moebius/moebius/**'
+      - 'moebius/tests/**'
+      - 'moebius/xmake.lua'
+      - '.github/workflows/ci-debug-macos-arm64.yml'
+      - 'TeXmacs/tests/*.scm'
+      - 'TeXmacs/progs/**'
+      - 'TeXmacs/plugins/**'
+      - '3rdparty/**'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'src/**'
+      - '!src/Plugins/Windows/**'
+      - 'tests/**'
+      - 'xmake.lua'
+      - 'xmake/packages.lua'
+      - 'xmake/research.lua'
+      - 'xmake/options.lua'
+      - 'xmake/requires.lua'
+      - 'xmake/targets/**'
+      - 'xmake/packages/**'
+      - 'xmake-requires.lock'
+      - 'lolly/Data/**'
+      - 'lolly/Kernel/**'
+      - 'lolly/Plugins/**'
+      - 'lolly/System/**'
+      - 'lolly/lolly/**'
+      - 'lolly/tests/**'
+      - 'lolly/xmake.lua'
+      - 'moebius/Data/**'
+      - 'moebius/Kernel/**'
+      - 'moebius/Scheme/**'
+      - 'moebius/moebius/**'
+      - 'moebius/tests/**'
+      - 'moebius/xmake.lua'
+      - '.github/workflows/ci-debug-macos-arm64.yml'
+      - 'TeXmacs/tests/*.scm'
+      - 'TeXmacs/progs/**'
+      - 'TeXmacs/plugins/**'
+      - '3rdparty/**'
+
+jobs:
+  macosbuild:
+    strategy:
+      matrix:
+        os: [macos-14]
+        arch: [arm64]
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 45
+    if: always()
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.commit || github.sha }}
+          fetch-depth: 1
+
+      - name: debug checkout
+        run: |
+          echo "PWD:"
+          pwd
+
+          echo "Workspace:"
+          echo "${{ github.workspace }}"
+
+          echo "TeXmacs:"
+          ls -la TeXmacs || true
+
+          echo "TeXmacs/tests:"
+          ls -la TeXmacs/tests || true
+
+          echo "tmu:"
+          ls -la TeXmacs/tests/tmu || true
+
+          echo "git tracked tmu files:"
+          git ls-files 'TeXmacs/tests/tmu/**' | head -20
+
+      - name: cache xmake
+        uses: actions/cache@v4
+        with:
+          path: |
+            ${{github.workspace}}/build/.build_cache
+            /Users/runner/.xmake
+          key: xmake-${{ runner.os }}-${{ matrix.arch }}-${{ hashFiles('xmake/vars.lua', 'lolly/xmake.lua', 'moebius/xmake.lua') }}
+
+      - name: set XMAKE_GLOBALDIR
+        run: echo "XMAKE_GLOBALDIR=${{ runner.workspace }}/xmake-global" >> $GITHUB_ENV
+
+      - uses: xmake-io/github-action-setup-xmake@v1
+        with:
+          xmake-version: v3.0.4
+          actions-cache-folder: '.xmake-cache'
+
+      - name: xmake repo --update
+        run: xmake repo --update
+
+      - name: cache packages from xrepo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ${{ env.XMAKE_GLOBALDIR }}/.xmake/packages
+          key: xrepo-${{ runner.os }}-${{ matrix.arch }}-${{ hashFiles('xmake/vars.lua', 'lolly/xmake.lua', 'moebius/xmake.lua') }}
+
+      - name: config
+        run: xmake config --policies=build.ccache -o ${{ runner.workspace }}/build -m releasedbg --loro=yes --qt_frontend=no --cli_frontend=yes --pdfhummus=no --yes
+      - name: build moebius
+        run: xmake build --yes -vD libmoebius
+      - name: test moebius
+        run: xmake test-with-log
+
+      # - name: integration test
+      #  run: xmake run --yes -vD --group=integration_tests
+      #  env:
+      #    QT_QPA_PLATFORM: offscreen
diff --git a/moebius/tests/Data/loro_tmu_test.cpp b/moebius/tests/Data/loro_tmu_test.cpp
index 37914cdad4..00fc2f5168 100644
--- a/moebius/tests/Data/loro_tmu_test.cpp
+++ b/moebius/tests/Data/loro_tmu_test.cpp
@@ -34,13 +34,39 @@ ensure_labels () {
 static string
 resolve_fixture_dir () {
   const char* cands[]= {
+      "TeXmacs/tests/tmu/",
+      "../TeXmacs/tests/tmu/",
+      "../../TeXmacs/tests/tmu/",
+      "../../../TeXmacs/tests/tmu/",
       "../../../../TeXmacs/tests/tmu/",
+      "../../../../../TeXmacs/tests/tmu/",
+      "../../../../../../TeXmacs/tests/tmu/",
+      "../../../../../../../TeXmacs/tests/tmu/",
   };
+
+  cout << "========== resolve_fixture_dir ==========" << LF;
+
   int n= sizeof (cands) / sizeof (cands[0]);
+
   for (int i= 0; i < n; i++) {
     string c= cands[i];
-    if (is_directory (c)) return c;
+
+    cout << "candidate[" << i << "]: " << c << LF;
+
+    bool exists= is_directory (c);
+
+    cout << "  is_directory: " << (exists ? "true" : "false") << LF;
+
+    if (exists) {
+      cout << "  >>> FOUND: " << c << LF;
+      cout << "=========================================" << LF;
+      return c;
+    }
   }
+
+  cout << "  >>> NO FIXTURE DIRECTORY FOUND" << LF;
+  cout << "=========================================" << LF;
+
   return string ();
 }
 
diff --git a/moebius/xmake.lua b/moebius/xmake.lua
index add29714a1..483776dea1 100644
--- a/moebius/xmake.lua
+++ b/moebius/xmake.lua
@@ -142,3 +142,66 @@ cpp_bench_on_all_plat = os.files("bench/**_bench.cpp")
 for _, filepath in ipairs(cpp_bench_on_all_plat) do
     add_bench_target (filepath)
 end
+
+task("test-with-log")
+    set_menu {
+        usage = "xmake test-with-log",
+        description = "Run tests and print stdout/stderr on failure"
+    }
+
+    on_run(function ()
+        local failed = false
+
+        try
+        {
+            function ()
+                os.execv("xmake", {
+                    "test",
+                    "-vD",
+                    "moebius_tests/*"
+                })
+            end,
+
+            catch
+            {
+                function ()
+                    failed = true
+                end
+            }
+        }
+
+        if not failed then
+            return
+        end
+
+        print("")
+        print("========================================")
+        print("TEST FAILED - DUMPING TEST LOGS")
+        print("========================================")
+
+        local stdout_log =
+            path.absolute("../build/.gens/moebius_tests_loro_tmu_test/macosx/arm64/releasedbg/tests/moebius_tests/loro_tmu_test.stdout.log")
+
+        local stderr_log =
+            path.absolute("../build/.gens/moebius_tests_loro_tmu_test/macosx/arm64/releasedbg/tests/moebius_tests/loro_tmu_test.errors.log")
+
+        print("")
+        print("========== stdout: " .. stdout_log .. " ==========")
+
+        if os.isfile(stdout_log) then
+            print(io.readfile(stdout_log))
+        else
+            print("stdout log not found")
+        end
+
+        print("")
+        print("========== stderr: " .. stderr_log .. " ==========")
+
+        if os.isfile(stderr_log) then
+            print(io.readfile(stderr_log))
+        else
+            print("stderr log not found")
+        end
+
+        os.raise("tests failed")
+    end)
\ No newline at end of file