maint: Use Catch2 instead of doctest (#3618)

dev/environment-dev.yml

@@ -21,7 +21,7 @@ dependencies:
   - yaml-cpp >=0.8.0
   - sel(win): winreg
   # libmamba test dependencies
-  - doctest
+  - catch2
   # micromamba dependencies
   - cli11 >=2.2
   # micromamba test dependencies

dev/environment-micromamba-static.yml

@@ -30,6 +30,6 @@ dependencies:
   - libnghttp2-static
   - lz4-c-static
   # libmamba test dependencies
-  - doctest
+  - catch2
   # micromamba dependencies
   - cli11 >=2.2,<3

libmamba/ext/solv-cpp/tests/CMakeLists.txt

@@ -9,6 +9,7 @@ cmake_minimum_required(VERSION 3.16)
 add_executable(
     test_solv_cpp
     src/main.cpp
+    src/msvc_catch_string_view.cpp
     src/pool_data.cpp
     src/test_pool.cpp
     src/test_queue.cpp
@@ -19,7 +20,8 @@ add_executable(
     src/test_transaction.cpp
 )
 target_include_directories(test_solv_cpp PRIVATE src/)
-target_compile_definitions(test_solv_cpp PRIVATE DOCTEST_CONFIG_USE_STD_HEADERS)
-
-find_package(doctest REQUIRED)
-target_link_libraries(test_solv_cpp PRIVATE doctest::doctest solv::cpp)
+find_package(Catch2 REQUIRED)
+target_link_libraries(test_solv_cpp PRIVATE Catch2::Catch2WithMain solv::cpp)
+set_target_properties(
+    test_solv_cpp PROPERTIES COMPILE_DEFINITIONS CATCH_CONFIG_ENABLE_ALL_STRINGMAKERS
+)

libmamba/ext/solv-cpp/tests/src/main.cpp

@@ -1,3 +1,3 @@
-#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#define CATCH_CONFIG_MAIN
 
-#include <doctest/doctest.h>
+#include <catch2/catch_all.hpp>

libmamba/ext/solv-cpp/tests/src/msvc_catch_string_view.cpp

@@ -0,0 +1,22 @@
+#ifdef _WIN32
+
+// Catch compiled on `conda-forge` for MSVC doesn't support outputting `string_view`.
+// So we have to define StringMaker for it ourselves.
+// The declaration is present though, so this only causes link errors.
+
+#include <string>
+#include <string_view>
+
+#include <catch2/catch_tostring.hpp>
+
+namespace Catch
+{
+
+    std::string StringMaker<std::string_view>::convert(std::string_view str)
+    {
+        return std::string(str);
+    }
+
+}
+
+#endif