Merge pull request #1439 from onqtam/doctest

moved from Catch to doctest for unit tests

.github/CONTRIBUTING.md

@@ -32,7 +32,7 @@ To make changes, you need to edit the following files:
 
 1. [`include/nlohmann/*`](https://github.com/nlohmann/json/tree/develop/include/nlohmann) - These files are the sources of the library. Before testing or creating a pull request, execute `make amalgamate` to regenerate `single_include/nlohmann/json.hpp`.
 
-2. [`test/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/test/src) - These files contain the [Catch](https://github.com/philsquared/Catch) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
+2. [`test/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/test/src) - These files contain the [doctest](https://github.com/onqtam/doctest) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
 
    If you add or change a feature, please also add a unit test to this file. The unit tests can be compiled and executed with
 

Makefile

@@ -100,7 +100,7 @@ doctest:
 # -Wno-c++2a-compat: u8 literals will behave differently in C++20...
 # -Wno-deprecated-declarations: the library deprecated some functions
 # -Wno-documentation-unknown-command: code uses user-defined commands like @complexity
-# -Wno-exit-time-destructors: warning in Catch code
+# -Wno-exit-time-destructors: warning in json code triggered by NLOHMANN_JSON_SERIALIZE_ENUM
 # -Wno-float-equal: not all comparisons in the tests can be replaced by Approx
 # -Wno-keyword-macro: unit-tests use "#define private public"
 # -Wno-padded: padding is nothing to warn about

README.md

@@ -1270,13 +1270,13 @@ The library itself consists of a single header file licensed under the MIT licen
 - [**American fuzzy lop**](http://lcamtuf.coredump.cx/afl/) for fuzz testing
 - [**AppVeyor**](https://www.appveyor.com) for [continuous integration](https://ci.appveyor.com/project/nlohmann/json) on Windows
 - [**Artistic Style**](http://astyle.sourceforge.net) for automatic source code identation
-- [**Catch**](https://github.com/philsquared/Catch) for the unit tests
 - [**Clang**](http://clang.llvm.org) for compilation with code sanitizers
 - [**CMake**](https://cmake.org) for build automation
 - [**Codacity**](https://www.codacy.com) for further [code analysis](https://www.codacy.com/app/nlohmann/json)
 - [**Coveralls**](https://coveralls.io) to measure [code coverage](https://coveralls.io/github/nlohmann/json)
 - [**Coverity Scan**](https://scan.coverity.com) for [static analysis](https://scan.coverity.com/projects/nlohmann-json)
 - [**cppcheck**](http://cppcheck.sourceforge.net) for static analysis
+- [**doctest**](https://github.com/onqtam/doctest) for the unit tests
 - [**Doozer**](https://doozer.io) for [continuous integration](https://doozer.io/nlohmann/json) on Linux (CentOS, Raspbian, Fedora)
 - [**Doxygen**](http://www.stack.nl/~dimitri/doxygen/) to generate [documentation](https://nlohmann.github.io/json/)
 - [**git-update-ghpages**](https://github.com/rstacruz/git-update-ghpages) to upload the documentation to gh-pages

test/CMakeLists.txt

@@ -22,7 +22,7 @@ if(JSON_NoExceptions)
     if(NOT MSVC)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DJSON_NOEXCEPTION")
     endif()
-    set(CATCH_TEST_FILTER -e)
+    set(DOCTEST_TEST_FILTER --no-throw)
 endif()
 
 if(JSON_Coverage)
@@ -54,22 +54,22 @@ if(JSON_Coverage)
 endif()
 
 #############################################################################
-# Catch library with the main function to speed up build
+# doctest library with the main function to speed up build
 #############################################################################
 
-add_library(catch_main OBJECT
+add_library(doctest_main OBJECT
     "src/unit.cpp"
 )
-set_target_properties(catch_main PROPERTIES
+set_target_properties(doctest_main PROPERTIES
     COMPILE_DEFINITIONS "$<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>"
     COMPILE_OPTIONS "$<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>"
 )
 if (${CMAKE_VERSION} VERSION_LESS "3.8.0") 
-    target_compile_features(catch_main PUBLIC cxx_range_for)
+    target_compile_features(doctest_main PUBLIC cxx_range_for)
 else()
-    target_compile_features(catch_main PUBLIC cxx_std_11)
+    target_compile_features(doctest_main PUBLIC cxx_std_11)
 endif()
-target_include_directories(catch_main PRIVATE "thirdparty/catch")
+target_include_directories(doctest_main PRIVATE "thirdparty/doctest")
 
 # https://stackoverflow.com/questions/2368811/how-to-set-warning-level-in-cmake
 if(MSVC)
@@ -99,10 +99,9 @@ foreach(file ${files})
     get_filename_component(file_basename ${file} NAME_WE)
     string(REGEX REPLACE "unit-([^$]+)" "test-\\1" testcase ${file_basename})
 
-    add_executable(${testcase} $<TARGET_OBJECTS:catch_main> ${file})
+    add_executable(${testcase} $<TARGET_OBJECTS:doctest_main> ${file})
     target_compile_definitions(${testcase} PRIVATE
-      CATCH_CONFIG_FAST_COMPILE
+      DOCTEST_CONFIG_SUPER_FAST_ASSERTS
-      $<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>
     )
     target_compile_options(${testcase} PRIVATE
         $<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>
@@ -110,26 +109,26 @@ foreach(file ${files})
         $<$<CXX_COMPILER_ID:GNU>:-Wno-deprecated-declarations>
     )
     target_include_directories(${testcase} PRIVATE
-        thirdparty/catch
+        thirdparty/doctest
         thirdparty/fifo_map
     )
     target_link_libraries(${testcase} ${NLOHMANN_JSON_TARGET_NAME})
 
     add_test(NAME "${testcase}_default"
-      COMMAND ${testcase} ${CATCH_TEST_FILTER}
+      COMMAND ${testcase} ${DOCTEST_TEST_FILTER}
       WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
     )
     set_tests_properties("${testcase}_default" PROPERTIES LABELS "default")
 
     add_test(NAME "${testcase}_all"
-      COMMAND ${testcase} ${CATCH_TEST_FILTER} "*"
+      COMMAND ${testcase} ${DOCTEST_TEST_FILTER} --no-skip
       WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
     )
     set_tests_properties("${testcase}_all" PROPERTIES LABELS "all")
 
     if(JSON_Valgrind)
         add_test(NAME "${testcase}_valgrind"
-          COMMAND ${memcheck_command} ${CMAKE_CURRENT_BINARY_DIR}/${testcase} ${CATCH_TEST_FILTER}
+          COMMAND ${memcheck_command} ${CMAKE_CURRENT_BINARY_DIR}/${testcase} ${DOCTEST_TEST_FILTER}
           WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
         )
         set_tests_properties("${testcase}_valgrind" PROPERTIES LABELS "valgrind")

test/Makefile

@@ -4,7 +4,7 @@
 
 # additional flags
 CXXFLAGS += -std=c++11 -Wall -Wextra -pedantic -Wcast-align -Wcast-qual -Wno-ctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wmissing-declarations -Wmissing-include-dirs -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-overflow=5 -Wswitch -Wundef -Wno-unused -Wnon-virtual-dtor -Wreorder -Wdeprecated -Wno-float-equal
-CPPFLAGS += -I ../single_include -I . -I thirdparty/catch -I thirdparty/fifo_map -DCATCH_CONFIG_FAST_COMPILE
+CPPFLAGS += -I ../single_include -I . -I thirdparty/doctest -I thirdparty/fifo_map -DDOCTEST_CONFIG_SUPER_FAST_ASSERTS
 
 SOURCES = src/unit.cpp \
           src/unit-algorithms.cpp \
@@ -63,11 +63,11 @@ clean:
 # single test file
 ##############################################################################
 
-json_unit: $(OBJECTS) ../single_include/nlohmann/json.hpp thirdparty/catch/catch.hpp
+json_unit: $(OBJECTS) ../single_include/nlohmann/json.hpp thirdparty/doctest/doctest.h
 	@echo "[CXXLD] $@"
 	@$(CXX) $(CXXFLAGS) $(LDFLAGS) $(OBJECTS) -o $@
 
-%.o: %.cpp ../single_include/nlohmann/json.hpp thirdparty/catch/catch.hpp
+%.o: %.cpp ../single_include/nlohmann/json.hpp thirdparty/doctest/doctest.h
 	@echo "[CXX]   $@"
 	@$(CXX) $(CXXFLAGS) $(CPPFLAGS) -c $< -o $@
 
@@ -76,7 +76,7 @@ json_unit: $(OBJECTS) ../single_include/nlohmann/json.hpp thirdparty/catch/catch
 # individual test cases
 ##############################################################################
 
-test-%: src/unit-%.o src/unit.o ../single_include/nlohmann/json.hpp thirdparty/catch/catch.hpp
+test-%: src/unit-%.o src/unit.o ../single_include/nlohmann/json.hpp thirdparty/doctest/doctest.h
 	@echo "[CXXLD] $@"
 	@$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $< src/unit.o -o $@
 

test/src/unit-algorithms.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-allocator.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 // special test case to check if memory is leaked if constructor throws
 

test/src/unit-alt-string.cpp

@@ -27,9 +27,10 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
+
 #include <string>
 #include <utility>
 

test/src/unit-bson.cpp

@@ -27,11 +27,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+
 #include <fstream>
+#include <sstream>
 
 TEST_CASE("BSON")
 {
@@ -1138,7 +1140,7 @@ TEST_CASE("BSON numerical data")
                     };
 
                     CHECK_THROWS_AS(json::to_bson(j), json::out_of_range&);
-                    CHECK_THROWS_WITH(json::to_bson(j), "[json.exception.out_of_range.407] integer number " + std::to_string(i) + " cannot be represented by BSON as it does not fit int64");
+                    CHECK_THROWS_WITH_STD_STR(json::to_bson(j), "[json.exception.out_of_range.407] integer number " + std::to_string(i) + " cannot be represented by BSON as it does not fit int64");
                 }
             }
 
@@ -1146,7 +1148,7 @@ TEST_CASE("BSON numerical data")
     }
 }
 
-TEST_CASE("BSON roundtrips", "[hide]")
+TEST_CASE("BSON roundtrips" * doctest::skip())
 {
     SECTION("reference files")
     {
@@ -1161,8 +1163,8 @@ TEST_CASE("BSON roundtrips", "[hide]")
         {
             CAPTURE(filename)
 
-            SECTION(filename + ": std::vector<uint8_t>")
             {
+                INFO_WITH_TEMP(filename + ": std::vector<uint8_t>");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1179,8 +1181,8 @@ TEST_CASE("BSON roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": std::ifstream")
             {
+                INFO_WITH_TEMP(filename + ": std::ifstream");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1194,8 +1196,8 @@ TEST_CASE("BSON roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": uint8_t* and size")
             {
+                INFO_WITH_TEMP(filename + ": uint8_t* and size");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1212,8 +1214,8 @@ TEST_CASE("BSON roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": output to output adapters")
             {
+                INFO_WITH_TEMP(filename + ": output to output adapters");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1224,8 +1226,8 @@ TEST_CASE("BSON roundtrips", "[hide]")
                     (std::istreambuf_iterator<char>(f_bson)),
                     std::istreambuf_iterator<char>());
 
-                SECTION(filename + ": output adapters: std::vector<uint8_t>")
                 {
+                    INFO_WITH_TEMP(filename + ": output adapters: std::vector<uint8_t>");
                     std::vector<uint8_t> vec;
                     json::to_bson(j1, vec);
 

test/src/unit-capacity.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-cbor.cpp

@@ -27,12 +27,16 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
 #include <fstream>
+#include <sstream>
+#include <iomanip>
+#include <set>
 
 class SaxCountdown
 {
@@ -1586,7 +1590,8 @@ TEST_CASE("single CBOR roundtrip")
     }
 }
 
-TEST_CASE("CBOR regressions", "[!throws]")
+#if not defined(JSON_NOEXCEPTION)
+TEST_CASE("CBOR regressions")
 {
     SECTION("fuzz test results")
     {
@@ -1655,12 +1660,13 @@ TEST_CASE("CBOR regressions", "[!throws]")
         }
     }
 }
+#endif
 
-TEST_CASE("CBOR roundtrips", "[hide]")
+TEST_CASE("CBOR roundtrips" * doctest::skip())
 {
     SECTION("input from flynn")
     {
-        // most of these are exluded due to differences in key order (not a real problem)
+        // most of these are excluded due to differences in key order (not a real problem)
         auto exclude_packed = std::set<std::string>
         {
             "test/data/json.org/1.json",
@@ -1827,8 +1833,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
         {
             CAPTURE(filename)
 
-            SECTION(filename + ": std::vector<uint8_t>")
             {
+                INFO_WITH_TEMP(filename + ": std::vector<uint8_t>");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1845,8 +1851,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": std::ifstream")
             {
+                INFO_WITH_TEMP(filename + ": std::ifstream");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1860,8 +1866,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": uint8_t* and size")
             {
+                INFO_WITH_TEMP(filename + ": uint8_t* and size");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1878,8 +1884,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": output to output adapters")
             {
+                INFO_WITH_TEMP(filename + ": output to output adapters");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1892,8 +1898,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
 
                 if (!exclude_packed.count(filename))
                 {
-                    SECTION(filename + ": output adapters: std::vector<uint8_t>")
                     {
+                        INFO_WITH_TEMP(filename + ": output adapters: std::vector<uint8_t>");
                         std::vector<uint8_t> vec;
                         json::to_cbor(j1, vec);
                         CHECK(vec == packed);
@@ -1904,7 +1910,8 @@ TEST_CASE("CBOR roundtrips", "[hide]")
     }
 }
 
-TEST_CASE("all CBOR first bytes", "[!throws]")
+#if not defined(JSON_NOEXCEPTION)
+TEST_CASE("all CBOR first bytes")
 {
     // these bytes will fail immediately with exception parse_error.112
     std::set<uint8_t> unsupported =
@@ -1968,7 +1975,7 @@ TEST_CASE("all CBOR first bytes", "[!throws]")
         {
             // check that parse_error.112 is only thrown if the
             // first byte is in the unsupported set
-            CAPTURE(e.what())
+            INFO_WITH_TEMP(e.what());
             if (std::find(unsupported.begin(), unsupported.end(), byte) != unsupported.end())
             {
                 CHECK(e.id == 112);
@@ -1980,6 +1987,7 @@ TEST_CASE("all CBOR first bytes", "[!throws]")
         }
     }
 }
+#endif
 
 TEST_CASE("examples from RFC 7049 Appendix A")
 {

test/src/unit-class_const_iterator.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 TEST_CASE("const_iterator class")
 {

test/src/unit-class_iterator.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 TEST_CASE("iterator class")
 {

test/src/unit-class_lexer.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 // shortcut to scan a string literal
 json::lexer::token_type scan_string(const char* s);

test/src/unit-class_parser.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 #include <valarray>
 
@@ -1105,8 +1106,8 @@ TEST_CASE("parser class")
                     // only check error message if c is not a control character
                     if (c > 0x1f)
                     {
-                        CHECK_THROWS_WITH(parser_helper(s.c_str()),
+                        CHECK_THROWS_WITH_STD_STR(parser_helper(s.c_str()),
-                                          "[json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid string: forbidden character after backslash; last read: '\"\\" + std::string(1, static_cast<char>(c)) + "'");
+                                                  "[json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid string: forbidden character after backslash; last read: '\"\\" + std::string(1, static_cast<char>(c)) + "'");
                     }
                     break;
                 }
@@ -1181,8 +1182,8 @@ TEST_CASE("parser class")
                     // only check error message if c is not a control character
                     if (c > 0x1f)
                     {
-                        CHECK_THROWS_WITH(parser_helper(s1.c_str()),
+                        CHECK_THROWS_WITH_STD_STR(parser_helper(s1.c_str()),
-                                          "[json.exception.parse_error.101] parse error at line 1, column 7: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s1.substr(0, 7) + "'");
+                                                  "[json.exception.parse_error.101] parse error at line 1, column 7: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s1.substr(0, 7) + "'");
                     }
 
                     CAPTURE(s2)
@@ -1190,8 +1191,8 @@ TEST_CASE("parser class")
                     // only check error message if c is not a control character
                     if (c > 0x1f)
                     {
-                        CHECK_THROWS_WITH(parser_helper(s2.c_str()),
+                        CHECK_THROWS_WITH_STD_STR(parser_helper(s2.c_str()),
-                                          "[json.exception.parse_error.101] parse error at line 1, column 6: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s2.substr(0, 6) + "'");
+                                                  "[json.exception.parse_error.101] parse error at line 1, column 6: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s2.substr(0, 6) + "'");
                     }
 
                     CAPTURE(s3)
@@ -1199,8 +1200,8 @@ TEST_CASE("parser class")
                     // only check error message if c is not a control character
                     if (c > 0x1f)
                     {
-                        CHECK_THROWS_WITH(parser_helper(s3.c_str()),
+                        CHECK_THROWS_WITH_STD_STR(parser_helper(s3.c_str()),
-                                          "[json.exception.parse_error.101] parse error at line 1, column 5: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s3.substr(0, 5) + "'");
+                                                  "[json.exception.parse_error.101] parse error at line 1, column 5: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s3.substr(0, 5) + "'");
                     }
 
                     CAPTURE(s4)
@@ -1208,8 +1209,8 @@ TEST_CASE("parser class")
                     // only check error message if c is not a control character
                     if (c > 0x1f)
                     {
-                        CHECK_THROWS_WITH(parser_helper(s4.c_str()),
+                        CHECK_THROWS_WITH_STD_STR(parser_helper(s4.c_str()),
-                                          "[json.exception.parse_error.101] parse error at line 1, column 4: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s4.substr(0, 4) + "'");
+                                                  "[json.exception.parse_error.101] parse error at line 1, column 4: syntax error while parsing value - invalid string: '\\u' must be followed by 4 hex digits; last read: '" + s4.substr(0, 4) + "'");
                     }
                 }
             }

test/src/unit-comparison.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-concepts.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-constructor1.cpp

@@ -27,16 +27,19 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 #include <deque>
 #include <forward_list>
 #include <fstream>
 #include <list>
+#include <set>
 #include <unordered_map>
 #include <unordered_set>
 #include <valarray>

test/src/unit-constructor2.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-convenience.cpp

@@ -27,11 +27,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
+
+#include <sstream>
 
 void check_escaped(const char* original, const char* escaped = "", const bool ensure_ascii = false);
 void check_escaped(const char* original, const char* escaped, const bool ensure_ascii)

test/src/unit-conversions.cpp

@@ -27,15 +27,17 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 #include <deque>
 #include <forward_list>
 #include <list>
+#include <set>
 #include <unordered_map>
 #include <unordered_set>
 #include <valarray>

test/src/unit-deserialization.cpp

@@ -27,12 +27,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
 #include <iostream>
+#include <sstream>
 #include <valarray>
 
 struct SaxEventLogger : public nlohmann::json_sax<json>

test/src/unit-element_access1.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-element_access2.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
@@ -1072,7 +1072,8 @@ TEST_CASE("element access 2")
     }
 }
 
-TEST_CASE("element access 2 (throwing tests)", "[!throws]")
+#if not defined(JSON_NOEXCEPTION)
+TEST_CASE("element access 2 (throwing tests)")
 {
     SECTION("object")
     {
@@ -1105,3 +1106,4 @@ TEST_CASE("element access 2 (throwing tests)", "[!throws]")
         }
     }
 }
+#endif

test/src/unit-inspection.cpp

@@ -27,12 +27,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
-#include <fstream>
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
+#include <fstream>
+#include <sstream>
+
 TEST_CASE("object inspection")
 {
     SECTION("convenience type checker")

test/src/unit-items.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-iterators1.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 TEST_CASE("iterators 1")
 {

test/src/unit-iterators2.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-json_patch.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
@@ -342,7 +342,7 @@ TEST_CASE("JSON patch")
 
             // check that evaluation throws
             CHECK_THROWS_AS(doc.patch(patch), json::other_error&);
-            CHECK_THROWS_WITH(doc.patch(patch), "[json.exception.other_error.501] unsuccessful: " + patch[0].dump());
+            CHECK_THROWS_WITH_STD_STR(doc.patch(patch), "[json.exception.other_error.501] unsuccessful: " + patch[0].dump());
         }
 
         SECTION("A.10. Adding a Nested Member Object")
@@ -483,7 +483,7 @@ TEST_CASE("JSON patch")
 
             // check that evaluation throws
             CHECK_THROWS_AS(doc.patch(patch), json::other_error&);
-            CHECK_THROWS_WITH(doc.patch(patch), "[json.exception.other_error.501] unsuccessful: " + patch[0].dump());
+            CHECK_THROWS_WITH_STD_STR(doc.patch(patch), "[json.exception.other_error.501] unsuccessful: " + patch[0].dump());
         }
 
         SECTION("A.16. Adding an Array Value")
@@ -1182,7 +1182,7 @@ TEST_CASE("JSON patch")
 
                 // the test will fail
                 CHECK_THROWS_AS(doc.patch(patch), json::other_error&);
-                CHECK_THROWS_WITH(doc.patch(patch), "[json.exception.other_error.501] unsuccessful: " + patch[0].dump());
+                CHECK_THROWS_WITH_STD_STR(doc.patch(patch), "[json.exception.other_error.501] unsuccessful: " + patch[0].dump());
             }
         }
     }
@@ -1268,7 +1268,7 @@ TEST_CASE("JSON patch")
 
             for (const auto& test : suite)
             {
-                CAPTURE(test.value("comment", ""))
+                INFO_WITH_TEMP(test.value("comment", ""));
 
                 // skip tests marked as disabled
                 if (test.value("disabled", false))

test/src/unit-json_pointer.cpp

@@ -27,11 +27,12 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 TEST_CASE("JSON pointers")
 {

test/src/unit-merge_patch.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-meta.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-modifiers.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-msgpack.cpp

@@ -27,12 +27,15 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
 #include <fstream>
+#include <sstream>
+#include <iomanip>
+#include <set>
 
 class SaxCountdown
 {
@@ -1345,7 +1348,7 @@ TEST_CASE("single MessagePack roundtrip")
 }
 
 
-TEST_CASE("MessagePack roundtrips", "[hide]")
+TEST_CASE("MessagePack roundtrips" * doctest::skip())
 {
     SECTION("input from msgpack-python")
     {
@@ -1519,8 +1522,8 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
         {
             CAPTURE(filename)
 
-            SECTION(filename + ": std::vector<uint8_t>")
             {
+                INFO_WITH_TEMP(filename + ": std::vector<uint8_t>");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1537,8 +1540,8 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": std::ifstream")
             {
+                INFO_WITH_TEMP(filename + ": std::ifstream");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1552,8 +1555,8 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": uint8_t* and size")
             {
+                INFO_WITH_TEMP(filename + ": uint8_t* and size");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1570,8 +1573,8 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": output to output adapters")
             {
+                INFO_WITH_TEMP(filename + ": output to output adapters");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -1584,8 +1587,8 @@ TEST_CASE("MessagePack roundtrips", "[hide]")
 
                 if (!exclude_packed.count(filename))
                 {
-                    SECTION(filename + ": output adapters: std::vector<uint8_t>")
                     {
+                        INFO_WITH_TEMP(filename + ": output adapters: std::vector<uint8_t>");
                         std::vector<uint8_t> vec;
                         json::to_msgpack(j1, vec);
                         CHECK(vec == packed);

test/src/unit-noexcept.cpp

@@ -27,7 +27,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+
 #include <nlohmann/json.hpp>
 
 using nlohmann::json;

test/src/unit-pointer_access.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-readme.cpp

@@ -27,7 +27,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
@@ -35,16 +36,19 @@ using nlohmann::json;
 #include <deque>
 #include <forward_list>
 #include <list>
+#include <set>
 #include <unordered_map>
 #include <unordered_set>
 #include <iostream>
+#include <sstream>
+#include <iomanip>
 
 #if defined(_MSC_VER)
     #pragma warning (push)
     #pragma warning (disable : 4189) // local variable is initialized but not referenced
 #endif
 
-TEST_CASE("README", "[hide]")
+TEST_CASE("README" * doctest::skip())
 {
     {
         // redirect std::cout for the README file

test/src/unit-reference_access.cpp

@@ -27,7 +27,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-regression.cpp

@@ -27,11 +27,21 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+DOCTEST_GCC_SUPPRESS_WARNING("-Wfloat-equal")
+
+// for some reason including this after the json header leads to linker errors with VS 2017...
+#include <locale>
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
+
+#include <fstream>
+#include <sstream>
+#include <list>
+#include <cstdio>
 
 #if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
     #define JSON_HAS_CPP_17
@@ -43,10 +53,6 @@ using nlohmann::json;
 
 #include "fifo_map.hpp"
 
-#include <fstream>
-#include <list>
-#include <cstdio>
-
 /////////////////////////////////////////////////////////////////////
 // for #972
 /////////////////////////////////////////////////////////////////////
@@ -287,7 +293,7 @@ TEST_CASE("regression tests")
         int number = j["Number"];
         CHECK(number == 100);
         float foo = j["Foo"];
-        CHECK(foo == Approx(42.42));
+        CHECK(static_cast<double>(foo) == Approx(42.42));
     }
 
     SECTION("issue #89 - nonstandard integer type")
@@ -297,8 +303,7 @@ TEST_CASE("regression tests")
             nlohmann::basic_json<std::map, std::vector, std::string, bool, int32_t, uint32_t, float>;
         custom_json j;
         j["int_1"] = 1;
-        // we need to cast to int to compile with Catch - the value is int32_t
+        CHECK(j["int_1"] == 1);
-        CHECK(static_cast<int>(j["int_1"]) == 1);
 
         // tests for correct handling of non-standard integers that overflow the type selected by the user
 
@@ -1780,7 +1785,8 @@ TEST_CASE("regression tests")
     }
 }
 
-TEST_CASE("regression tests, exceptions dependent", "[!throws]")
+#if not defined(JSON_NOEXCEPTION)
+TEST_CASE("regression tests, exceptions dependent")
 {
     SECTION("issue #1340 - eof not set on exhausted input stream")
     {
@@ -1792,3 +1798,4 @@ TEST_CASE("regression tests, exceptions dependent", "[!throws]")
         CHECK(s.eof());
     }
 }
+#endif

test/src/unit-serialization.cpp

@@ -27,11 +27,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
+#include <sstream>
+#include <iomanip>
+
 TEST_CASE("serialization")
 {
     SECTION("operator<<")

test/src/unit-testsuites.cpp

@@ -27,7 +27,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;

test/src/unit-to_chars.cpp

@@ -31,7 +31,7 @@ SOFTWARE.
 // Only compile these tests if 'float' and 'double' are IEEE-754 single- and
 // double-precision numbers, resp.
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::detail::dtoa_impl::reinterpret_bits;

test/src/unit-ubjson.cpp

@@ -27,12 +27,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
 #include <fstream>
+#include <set>
 
 class SaxCountdown
 {
@@ -2113,7 +2114,8 @@ TEST_CASE("Universal Binary JSON Specification Examples 1")
     }
 }
 
-TEST_CASE("all UBJSON first bytes", "[!throws]")
+#if not defined(JSON_NOEXCEPTION)
+TEST_CASE("all UBJSON first bytes")
 {
     // these bytes will fail immediately with exception parse_error.112
     std::set<uint8_t> supported =
@@ -2134,7 +2136,7 @@ TEST_CASE("all UBJSON first bytes", "[!throws]")
         {
             // check that parse_error.112 is only thrown if the
             // first byte is not in the supported set
-            CAPTURE(e.what())
+            INFO_WITH_TEMP(e.what());
             if (std::find(supported.begin(), supported.end(), byte) == supported.end())
             {
                 CHECK(e.id == 112);
@@ -2146,8 +2148,9 @@ TEST_CASE("all UBJSON first bytes", "[!throws]")
         }
     }
 }
+#endif
 
-TEST_CASE("UBJSON roundtrips", "[hide]")
+TEST_CASE("UBJSON roundtrips" * doctest::skip())
 {
     SECTION("input from self-generated UBJSON files")
     {
@@ -2199,8 +2202,8 @@ TEST_CASE("UBJSON roundtrips", "[hide]")
         {
             CAPTURE(filename)
 
-            SECTION(filename + ": std::vector<uint8_t>")
             {
+                INFO_WITH_TEMP(filename + ": std::vector<uint8_t>");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -2217,8 +2220,8 @@ TEST_CASE("UBJSON roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": std::ifstream")
             {
+                INFO_WITH_TEMP(filename + ": std::ifstream");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -2232,8 +2235,8 @@ TEST_CASE("UBJSON roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": uint8_t* and size")
             {
+                INFO_WITH_TEMP(filename + ": uint8_t* and size");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -2250,8 +2253,8 @@ TEST_CASE("UBJSON roundtrips", "[hide]")
                 CHECK(j1 == j2);
             }
 
-            SECTION(filename + ": output to output adapters")
             {
+                INFO_WITH_TEMP(filename + ": output to output adapters");
                 // parse JSON file
                 std::ifstream f_json(filename);
                 json j1 = json::parse(f_json);
@@ -2262,8 +2265,8 @@ TEST_CASE("UBJSON roundtrips", "[hide]")
                     (std::istreambuf_iterator<char>(f_ubjson)),
                     std::istreambuf_iterator<char>());
 
-                SECTION(filename + ": output adapters: std::vector<uint8_t>")
                 {
+                    INFO_WITH_TEMP(filename + ": output adapters: std::vector<uint8_t>");
                     std::vector<uint8_t> vec;
                     json::to_ubjson(j1, vec);
                     CHECK(vec == packed);

test/src/unit-udt.cpp

@@ -27,10 +27,9 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
-
 using nlohmann::json;
 
 #include <array>
@@ -236,7 +235,7 @@ void from_json(const nlohmann::json& j, contact_book& cb)
 }
 }
 
-TEST_CASE("basic usage", "[udt]")
+TEST_CASE("basic usage" * doctest::test_suite("udt"))
 {
 
     // a bit narcissic maybe :) ?
@@ -392,7 +391,7 @@ struct adl_serializer<udt::legacy_type>
 };
 }
 
-TEST_CASE("adl_serializer specialization", "[udt]")
+TEST_CASE("adl_serializer specialization" * doctest::test_suite("udt"))
 {
     SECTION("partial specialization")
     {
@@ -468,7 +467,7 @@ struct adl_serializer<std::vector<float>>
 };
 }
 
-TEST_CASE("even supported types can be specialized", "[udt]")
+TEST_CASE("even supported types can be specialized" * doctest::test_suite("udt"))
 {
     json j = std::vector<float> {1.0, 2.0, 3.0};
     CHECK(j.dump() == R"("hijacked!")");
@@ -509,7 +508,7 @@ struct adl_serializer<std::unique_ptr<T>>
 };
 }
 
-TEST_CASE("Non-copyable types", "[udt]")
+TEST_CASE("Non-copyable types" * doctest::test_suite("udt"))
 {
     SECTION("to_json")
     {
@@ -650,7 +649,7 @@ std::ostream& operator<<(std::ostream& os, small_pod l)
 }
 }
 
-TEST_CASE("custom serializer for pods", "[udt]")
+TEST_CASE("custom serializer for pods" * doctest::test_suite("udt"))
 {
     using custom_json =
         nlohmann::basic_json<std::map, std::vector, std::string, bool,
@@ -691,7 +690,7 @@ struct another_adl_serializer
     }
 };
 
-TEST_CASE("custom serializer that does adl by default", "[udt]")
+TEST_CASE("custom serializer that does adl by default" * doctest::test_suite("udt"))
 {
     using json = nlohmann::json;
 
@@ -797,7 +796,7 @@ template <typename T>
 struct is_constructible_patched<T, decltype(void(json(std::declval<T>())))> : std::true_type {};
 }
 
-TEST_CASE("an incomplete type does not trigger a compiler error in non-evaluated context", "[udt]")
+TEST_CASE("an incomplete type does not trigger a compiler error in non-evaluated context" * doctest::test_suite("udt"))
 {
     static_assert(not is_constructible_patched<json, incomplete>::value, "");
 }

test/src/unit-unicode.cpp

@@ -27,14 +27,20 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
+
+// for some reason including this after the json header leads to linker errors with VS 2017...
+#include <locale>
 
 #define private public
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#undef private
 
 #include <fstream>
+#include <sstream>
 #include <iostream>
+#include <iomanip>
 
 extern size_t calls;
 size_t calls = 0;
@@ -160,7 +166,7 @@ void check_utf8string(bool success_expected, int byte1, int byte2 = -1, int byte
     }
 }
 
-TEST_CASE("Unicode", "[hide]")
+TEST_CASE("Unicode" * doctest::skip())
 {
     SECTION("RFC 3629")
     {

test/src/unit-wstring.cpp

@@ -27,10 +27,9 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#include "catch.hpp"
+#include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
-
 using nlohmann::json;
 
 bool wstring_is_utf16();

test/src/unit.cpp

@@ -27,5 +27,5 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#define CATCH_CONFIG_MAIN
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
-#include "catch.hpp"
+#include "doctest_compatibility.h"

test/thirdparty/catch/LICENSE_1_0.txt

@@ -1,23 +0,0 @@
-Boost Software License - Version 1.0 - August 17th, 2003
-
-Permission is hereby granted, free of charge, to any person or organization
-obtaining a copy of the software and accompanying documentation covered by
-this license (the "Software") to use, reproduce, display, distribute,
-execute, and transmit the Software, and to prepare derivative works of the
-Software, and to permit third-parties to whom the Software is furnished to
-do so, all subject to the following:
-
-The copyright notices in the Software and this entire statement, including
-the above license grant, this restriction and the following disclaimer,
-must be included in all copies of the Software, in whole or in part, and
-all derivative works of the Software, unless such copies or derivative
-works are solely in the form of machine-executable object code generated by
-a source language processor.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
-SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
-FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.

test/thirdparty/doctest/LICENSE.txt

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016-2018 Viktor Kirilov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

test/thirdparty/doctest/doctest_compatibility.h

@@ -0,0 +1,37 @@
+#ifndef DOCTEST_COMPATIBILITY
+#define DOCTEST_COMPATIBILITY
+
+#define DOCTEST_CONFIG_VOID_CAST_EXPRESSIONS
+#define DOCTEST_THREAD_LOCAL // enable single-threaded builds on XCode 6/7 - https://github.com/onqtam/doctest/issues/172
+#include "doctest.h"
+
+// Catch doesn't require a semicolon after CAPTURE but doctest does
+#undef CAPTURE
+#define CAPTURE(x) DOCTEST_CAPTURE(x);
+
+// Sections from Catch are called Subcases in doctest and don't work with std::string by default
+#undef SUBCASE
+#define SECTION(x) DOCTEST_SUBCASE(x)
+
+// convenience macro around INFO since it doesn't support temporaries (it is optimized to avoid allocations for runtime speed)
+#define INFO_WITH_TEMP_IMPL(x, var_name) const auto var_name = x; INFO(var_name) // lvalue!
+#define INFO_WITH_TEMP(x) INFO_WITH_TEMP_IMPL(x, DOCTEST_ANONYMOUS(DOCTEST_STD_STRING_))
+
+// doctest doesn't support THROWS_WITH for std::string out of the box (has to include <string>...)
+#define CHECK_THROWS_WITH_STD_STR_IMPL(expr, str, var_name)                    \
+    do {                                                                       \
+        std::string var_name = str;                                            \
+        CHECK_THROWS_WITH(expr, var_name.c_str());                             \
+    } while (false)
+#define CHECK_THROWS_WITH_STD_STR(expr, str)                                   \
+    CHECK_THROWS_WITH_STD_STR_IMPL(expr, str, DOCTEST_ANONYMOUS(DOCTEST_STD_STRING_))
+
+// included here because for some tests in the json repository private is defined as
+// public and if no STL header is included before that then in the json include when STL
+// stuff is included the MSVC STL complains (errors) that C++ keywords are being redefined
+#include <iosfwd>
+
+// Catch does this by default
+using doctest::Approx;
+
+#endif