Migrate CI from CircleCI to GitHub Actions and modernize test infrastructure

.github/dependabot.yml

@@ -0,0 +1,15 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
+  # Maintain dependencies for git submodules
+  - package-ecosystem: "gitsubmodule"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - 'release/*'
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    strategy:
+      matrix:
+        build_type: [Debug, Release]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y cmake g++
+
+    - name: Configure CMake
+      run: |
+        mkdir build
+        cd build
+        cmake -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} ..
+
+    - name: Build
+      run: |
+        cd build
+        make
+
+    - name: Run tests
+      run: |
+        cd build
+        ./test/testmain

.gitignore

@@ -33,5 +33,6 @@
 
 /.idea/
 /cmake-*/
+/build-*/
 /test/catch.hpp
 

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "deps/fbitset"]
 	path = deps/fbitset
-	url = https://github.com/tschijnmo/fbitset
+	url = https://github.com/DrudgeCAS/fbitset

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://circleci.com/gh/tschijnmo/libparenth.svg?style=shield)](https://circleci.com/gh/tschijnmo/libparenth)
+[![CI](https://github.com/DrudgeCAS/libparenth/actions/workflows/ci.yml/badge.svg)](https://github.com/DrudgeCAS/libparenth/actions/workflows/ci.yml)
 
 # libparenth
 Fast searching for optimal parenthesization of tensor contractions

test/CMakeLists.txt

@@ -1,16 +1,17 @@
-# Download the Catch2 single header.
+# Fetch Catch2 v3.11.0
+include(FetchContent)
 
-file(DOWNLOAD
-        "https://github.com/catchorg/Catch2/releases/download/v2.0.1/catch.hpp"
-        "${CMAKE_CURRENT_BINARY_DIR}/catch.hpp"
-        )
+FetchContent_Declare(
+  Catch2
+  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+  GIT_TAG        v3.11.0
+)
 
-include_directories(testmain
-        PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
-        )
+FetchContent_MakeAvailable(Catch2)
 
 # The main test driver.
 add_executable(testmain
-        testmain.cpp
         matrixchain.cpp
         )
+
+target_link_libraries(testmain PRIVATE Catch2::Catch2WithMain)

test/matrixchain.cpp

@@ -10,12 +10,22 @@
  */
 
 #include <initializer_list>
+#include <sstream>
 #include <vector>
 
-#include <catch.hpp>
-
 #include <libparenth.hpp>
 
+// Disable Catch2's range detection for fbitset by providing stream insertion operator
+namespace fbitset {
+    template<int N>
+    inline std::ostream& operator<<(std::ostream& os, const Fbitset<N>& fs) {
+        os << "Fbitset<" << N << ">{count=" << fs.count() << "}";
+        return os;
+    }
+}
+
+#include <catch2/catch_test_macros.hpp>
+
 using namespace libparenth;
 
 TEST_CASE("A simple chain product of three matrices can be parenthesized")

test/testmain.cpp

@@ -1,8 +1,2 @@
-#define CATCH_CONFIG_RUNNER
-#include <catch.hpp>
-
-int main(int argc, char* argv[])
-{
-    int result = Catch::Session().run(argc, argv);
-    return result;
-}
+// Main test runner is provided by Catch2::Catch2WithMain
+// This file is kept for potential future custom main() if needed