Update test_harness.jl

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/workflows/ci.yml

@@ -7,17 +7,24 @@ on:
       - "master"
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 5
     strategy:
       fail-fast: false
       matrix:
         version:
           - "1.0"
+          - "lts"
           - "1" # automatically expands to the latest stable 1.x release of Julia
-          - nightly
+          - "pre"
+          - "nightly"
         os:
           - ubuntu-latest
           - macOS-latest
@@ -25,10 +32,22 @@ jobs:
         arch:
           - x64
           - x86
+          - aarch64
         # 32-bit Julia binaries are not available on macOS
+        # macOS runners use Apple Silicon (ARM64)
         exclude:
           - os: macOS-latest
             arch: x86
+          - os: macOS-latest
+            arch: x64
+          - os: ubuntu-latest
+            arch: aarch64
+          - os: windows-latest
+            arch: aarch64
+          # Julia 1.0 didn't support ARM64
+          - os: macOS-latest
+            arch: aarch64
+            version: "1.0"
 
     steps:
       - name: Checkout Example.jl

.github/workflows/test_logger_ci.yml

@@ -7,17 +7,24 @@ on:
       - "master"
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 5
     strategy:
       fail-fast: false
       matrix:
         version:
           - "1.6"
+          - "lts"
           - "1" # automatically expands to the latest stable 1.x release of Julia
-          - nightly
+          - "pre"
+          - "nightly"
         os:
           - ubuntu-latest
           - macOS-latest
@@ -25,10 +32,22 @@ jobs:
         arch:
           - x64
           - x86
+          - aarch64
         # 32-bit Julia binaries are not available on macOS
+        # macOS runners use Apple Silicon (ARM64)
         exclude:
           - os: macOS-latest
             arch: x86
+          - os: macOS-latest
+            arch: x64
+          - os: ubuntu-latest
+            arch: aarch64
+          - os: windows-latest
+            arch: aarch64
+          # Julia 1.6 didn't support ARM64
+          - os: macOS-latest
+            arch: aarch64
+            version: "1.6"
 
     steps:
       - name: Checkout julia-runtest

test_harness.jl

@@ -25,8 +25,16 @@ if haskey(ENV, "GITHUB_SHA") && get(ENV, "GITHUB_EVENT_NAME", "") == "pull_reque
 
         # Check if there's any difference between the merge commit and the PR head
         # In GitHub Actions, HEAD^2 is the PR head (second parent of merge commit)
-        # success() returns true if the command exits with 0 (no differences)
-        has_diff = !success(`git diff --quiet --exit-code HEAD^2 HEAD`)
+        # First check if HEAD^2 exists (i.e., this is actually a merge commit)
+        if success(`git rev-parse --verify --quiet HEAD^2`)
+            # Compare tree hashes to check if content actually differs
+            merge_tree = chomp(read(`git rev-parse HEAD^\{tree\}`, String))
+            pr_tree = chomp(read(`git rev-parse HEAD^2^\{tree\}`, String))
+            has_diff = merge_tree != pr_tree
+        else
+            # Not a merge commit, so no difference to report
+            has_diff = false
+        end
 
         if has_diff
             base_branch = isempty(base_branch_name) ? "the base branch" : "'$base_branch_name'"