Fix Windows CI by splitting tests and refactoring nested JSON

Split large interactions.cpp test file (5,548 lines) into 4 parts to reduce compilation memory pressure on Windows CI.

Refactored deeply nested JSON initializers to programmatic construction in interactions_part2a.cpp to avoid MSVC C1060 compiler heap exhaustion on GitHub's 16GB Windows runners.

Changes:
- Split tests/server/interactions.cpp into part1/part2a/part2b/part3
- Refactor 9-level nested JSON to step-by-step construction
- Add -A x64 flag for 64-bit Windows builds
- Use single-threaded builds on Windows (/m:1) for memory conservation

All 37 tests passing on all platforms (Ubuntu, Windows, macOS, ARM64).

Author: 0xeb

.github/workflows/ci.yml

@@ -35,9 +35,9 @@ jobs:
         uses: actions/cache@v4
         with:
           path: build/_deps
-          key: deps-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('CMakeLists.txt') }}
+          key: deps-${{ runner.os }}-${{ runner.arch }}-x64-${{ hashFiles('CMakeLists.txt') }}
           restore-keys: |
-            deps-${{ runner.os }}-${{ runner.arch }}-
+            deps-${{ runner.os }}-${{ runner.arch }}-x64-
 
       - name: Configure (Unix)
         if: runner.os != 'Windows'
@@ -49,20 +49,19 @@ jobs:
 
       - name: Configure (Windows)
         if: runner.os == 'Windows'
-        run: >
-          cmake -B build -S .
-          -G "Visual Studio 17 2022"
-          -DFASTMCPP_BUILD_TESTS=ON
-          -DFASTMCPP_BUILD_EXAMPLES=ON
+        run: |
+          if (Test-Path build) { Remove-Item -Recurse -Force build/CMakeCache.txt, build/CMakeFiles -ErrorAction SilentlyContinue }
+          cmake -B build -S . -G "Visual Studio 17 2022" -A x64 -DFASTMCPP_BUILD_TESTS=ON -DFASTMCPP_BUILD_EXAMPLES=ON
 
       - name: Build (Unix)
         if: runner.os != 'Windows'
         run: cmake --build build --config ${{ matrix.build_type }} --parallel
 
       - name: Build (Windows)
         if: runner.os == 'Windows'
-        # Single-threaded build on Windows to avoid compiler heap space issues with large test files
-        run: cmake --build build --config ${{ matrix.build_type }} --parallel 1
+        # Single-threaded build to avoid C1060 "compiler out of heap space" on GitHub's 16GB Windows runners
+        # Even /m:4 exhausts heap with deeply nested JSON initializers in test files
+        run: cmake --build build --config ${{ matrix.build_type }} -- /m:1 /p:CL_MPCount=1
 
       - name: Test
         run: ctest --test-dir build -C ${{ matrix.build_type }} --output-on-failure

CMakeLists.txt

@@ -229,9 +229,22 @@ if(FASTMCPP_BUILD_TESTS)
   target_link_libraries(fastmcpp_server_patterns PRIVATE fastmcpp_core)
   add_test(NAME fastmcpp_server_patterns COMMAND fastmcpp_server_patterns)
 
-  add_executable(fastmcpp_server_interactions tests/server/interactions.cpp)
-  target_link_libraries(fastmcpp_server_interactions PRIVATE fastmcpp_core)
-  add_test(NAME fastmcpp_server_interactions COMMAND fastmcpp_server_interactions)
+  # Split into 4 parts to avoid MSVC heap exhaustion on CI (C1060 + OutOfMemoryException)
+  add_executable(fastmcpp_server_interactions_part1 tests/server/interactions_part1.cpp)
+  target_link_libraries(fastmcpp_server_interactions_part1 PRIVATE fastmcpp_core)
+  add_test(NAME fastmcpp_server_interactions_part1 COMMAND fastmcpp_server_interactions_part1)
+
+  add_executable(fastmcpp_server_interactions_part2a tests/server/interactions_part2a.cpp)
+  target_link_libraries(fastmcpp_server_interactions_part2a PRIVATE fastmcpp_core)
+  add_test(NAME fastmcpp_server_interactions_part2a COMMAND fastmcpp_server_interactions_part2a)
+
+  add_executable(fastmcpp_server_interactions_part2b tests/server/interactions_part2b.cpp)
+  target_link_libraries(fastmcpp_server_interactions_part2b PRIVATE fastmcpp_core)
+  add_test(NAME fastmcpp_server_interactions_part2b COMMAND fastmcpp_server_interactions_part2b)
+
+  add_executable(fastmcpp_server_interactions_part3 tests/server/interactions_part3.cpp)
+  target_link_libraries(fastmcpp_server_interactions_part3 PRIVATE fastmcpp_core)
+  add_test(NAME fastmcpp_server_interactions_part3 COMMAND fastmcpp_server_interactions_part3)
 
   add_executable(fastmcpp_server_context_meta tests/server/context_meta.cpp)
   target_link_libraries(fastmcpp_server_context_meta PRIVATE fastmcpp_core)