tests: compile the five CAD test files that were never wired

tests/libslic3r/CMakeLists.txt added only test_caddocument.cpp under
SLIC3R_CAD. The other five shipped in the tree and were never compiled, so
49 TEST_CASE blocks looked like coverage and were not: sketch constraints,
sketch editing, sketch import, inference, and the libslvs constraint set.

They also still targeted Catch2 v2 — mainline is on v3, where the umbrella
header is catch2/catch_all.hpp and Approx lives in the Catch namespace rather
than at global scope. Both fixed; nothing else in the files changed.

Found by building the tree rather than reading it. Suite goes from 374 to 423
test cases, 54,424 to 54,620 assertions, all passing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/libslic3r/CMakeLists.txt

@@ -38,7 +38,13 @@ add_executable(${_TEST_NAME}_tests
     )
 
 if (SLIC3R_CAD)
-    target_sources(${_TEST_NAME}_tests PRIVATE test_caddocument.cpp)
+    target_sources(${_TEST_NAME}_tests PRIVATE
+        test_caddocument.cpp
+        test_sketchconstraints.cpp
+        test_sketchedit.cpp
+        test_sketchimport.cpp
+        test_sketchinference.cpp
+        test_slvs_constraints.cpp)
 endif ()
 
 if (TARGET OpenVDB::openvdb)

tests/libslic3r/test_sketchconstraints.cpp

@@ -1,4 +1,4 @@
-#include <catch2/catch.hpp>
+#include <catch2/catch_all.hpp>   // mainline OrcaSlicer ships Catch2 v3 (v2 was catch2/catch.hpp)
 #include "libslic3r/SketchConstraints.hpp"
 
 using namespace Slic3r;

tests/libslic3r/test_sketchedit.cpp

@@ -1,4 +1,4 @@
-#include <catch2/catch.hpp>
+#include <catch2/catch_all.hpp>   // mainline OrcaSlicer ships Catch2 v3 (v2 was catch2/catch.hpp)
 #include "libslic3r/SketchEngine.hpp"
 #include <cmath>
 

tests/libslic3r/test_sketchimport.cpp

@@ -1,4 +1,4 @@
-#include <catch2/catch.hpp>
+#include <catch2/catch_all.hpp>   // mainline OrcaSlicer ships Catch2 v3 (v2 was catch2/catch.hpp)
 
 #include "libslic3r/SketchImport.hpp"
 #include "libslic3r/Utils.hpp"   // resources_dir

tests/libslic3r/test_sketchinference.cpp

@@ -1,4 +1,5 @@
-#include <catch2/catch.hpp>
+#include <catch2/catch_all.hpp>   // mainline OrcaSlicer ships Catch2 v3 (v2 was catch2/catch.hpp)
+using Catch::Approx;   // v3 scopes Approx into the Catch namespace; v2 had it at global scope
 
 #include "libslic3r/SketchInference.hpp"
 

tests/libslic3r/test_slvs_constraints.cpp

@@ -1,4 +1,5 @@
-#include <catch2/catch.hpp>
+#include <catch2/catch_all.hpp>   // mainline OrcaSlicer ships Catch2 v3 (v2 was catch2/catch.hpp)
+using Catch::Approx;   // v3 scopes Approx into the Catch namespace; v2 had it at global scope
 
 #include "libslic3r/SketchSolver.hpp"
 #include "libslic3r/SketchEngine.hpp"