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 ## Features and design goals

 **doctest** has been designed from the start to be as **light** and **unintrusive** as possible. These key features should be kept.

 ## Unintrusive (transparent):

 - everything testing-related can be removed from the binary executable by defining the [**```DOCTEST_CONFIG_DISABLE```**](configuration.html#doctest_config_disable) identifier
 - very small and easy to integrate - single header
 - **Extremely** low footprint on compile times - [**around 25ms**](benchmarks.html#cost-of-including-the-header) of compile time overhead for including the header in a file
 - The [**fastest possible**](benchmarks.html#cost-of-an-assertion-macro) assertion macros - 50k asserts can compile for under 30 seconds (even under 10 sec)
 - doesn't drag any headers when included (except for in the translation unit where the library gets implemented)
 - everything is in the ```doctest``` namespace (and the implementation details are in a nested ```detail``` namespace)
 - all macros have prefixes - some by default have unprefixed versions as well but that is optional - see [**configuration**](configuration.html)
 - 0 warnings even with the most aggresive flags (on all tested compilers!!!)
 	- ```-Weverything -pedantic``` for **clang**
 	- ```-Wall -Wextra -pedantic``` and **>> over 35 <<** other warnings **not** covered by these flags for **GCC**!!! - see [**here**](../../scripts/cmake/common.cmake#L84)
 	- ```/Wall``` for **MSVC** (except for: ```C4514```, ```C4571```, ```C4710```, ```C4711```)
 - doesn't error on unrecognized [**command line**](commandline.html) options and supports prefixes for interop with client command line parsing
 - can set options [**procedurally**](main.html) and not deal with passing ```argc```/```argv``` from the command line
 - doesn't leave warnings disabled after itself

 ## Extremely portable:

 - Standards compliant **C++11** code - should work with any **C++11** capable compiler (use tag [**1.2.9**](https://github.com/onqtam/doctest/tree/1.2.9) for C++98 and older compilers)
 - tested with **GCC**: **4.8**, **4.9**, **5**, **6**, **7**, **8**
 - tested with **Clang**: **3.5**, **3.6**, **3.7**, **3.8**, **3.9**, **4**, **5**, **6** (XCode 8+)
 - tested with **MSVC**: **2015**, **2017** (also in 32 bit mode)
 - per-commit tested on [**travis**](https://travis-ci.org/onqtam/doctest) and [**appveyor**](https://ci.appveyor.com/project/onqtam/doctest) CI services
 	- warnings as errors even on the most aggressive warning levels - see [**here**](../../scripts/cmake/common.cmake#L84)
     - statically analyzed on the CI - [**Cppcheck**](http://cppcheck.sourceforge.net/) / [**Clang-Tidy**](http://oclint.org/) / [**Coverity Scan**](https://scan.coverity.com/) / [**OCLint**](https://scan.coverity.com/) / [**Visual Studio Analyzer**](https://docs.microsoft.com/en-us/visualstudio/code-quality/analyzing-c-cpp-code-quality-by-using-code-analysis)
 	- all tests have their output compared to reference output of a previous known good run
 	- all tests built and ran in **Debug**/**Release** modes
 	- all tests ran through **valgrind** under **Linux** (sadly [not under OSX](https://github.com/onqtam/doctest/issues/11))
 	- all tests ran through **address**, **UB** and **thread** sanitizers under **Linux**/**OSX**
 	- tests are ran in more than **168** different configurations on UNIX (Linux + OSX) on **travis** CI
 	- tests are ran in a total of **10** different configurations on Windows on **appveyor** CI

 ## Other features:

 - really easy to get started - it's just 1 header file - see the [**tutorial**](tutorial.html)
 - **very** light, unintrusive and portable - see the sections above - and also the [**benchmarks**](benchmarks.html)
 - offers a way to remove **everything** testing-related from the binary with the [**```DOCTEST_CONFIG_DISABLE```**](configuration.html#doctest_config_disable) macro
 - tests are registered automatically - no need to add them to a collection manually
 - [**Subcases**](tutorial.html#test-cases-and-subcases) - an intuitive way to share common setup and teardown code for test cases (alternative to [**test fixtures**](testcases.html#test-fixtures) which are also supported)
 - [**templated test cases**](parameterized-tests.html#templated-test-cases---parameterized-by-type) - parameterized by type
 - supports [**logging macros**](logging.html) for capturing local variables and strings - as a message for when an assert fails - with lazy stringification and no allocations when possible!
 - crash handling support - uses signals for UNIX and SEH for Windows
 - [**thread-safe**](faq.html#is-doctest-thread-aware) - asserts (and logging) can be used from multiple threads spawned from a single test case - [**example**](../../examples/all_features/concurrency.cpp)
 - an extensible [**reporter system**](reporters.html) (can be also used for implementing event listeners)
 - output from all compilers on all platforms is the same - byte by byte
 - binaries (exe/dll) can use the test runner of another binary - so tests end up in a single registry - [**example**](../../examples/executable_dll_and_plugin/)
 - supports [**BDD style**](testcases.html) tests
 - one core [**assertion macro**](assertions.html) for comparisons - standard C++ operators are used for the comparison (less than, equal, greater than...) - yet the full expression is decomposed and left and right values of the expression are logged
 - asserts can be used [**outside of a testing context**](assertions.html#using-asserts-out-of-a-testing-context) - [**example**](../../examples/all_features/asserts_used_outside_of_tests.cpp)
 - assertion macros for [**exceptions**](assertions.html#exceptions) - if something should or shouldn't throw
 - floating point comparison support - see the [**```Approx()```**](assertions.html#floating-point-comparisons) helper
 - powerful mechanism for [**stringification**](stringification.html) of user types - including [**exceptions**](stringification.html#translating-exceptions)!
 - tests can be grouped in [**test suites**](testcases.html#test-suites)
 - test case [**decorators**](testcases.html#decorators) such as ```description``` / ```skip``` / ```may_fail``` / ```should_fail``` / ```expected_failures``` / ```timeout```
 - can be used without exceptions and rtti - checkout [**```DOCTEST_CONFIG_NO_EXCEPTIONS```**](configuration.html#doctest_config_no_exceptions)
 - powerful [**command line**](commandline.html) with lots of options
 - can report the duration of test cases
 - tests can be [**filtered**](commandline.html) based on their name/file/test suite using wildcards
 - can [**filter**](commandline.html) subcases using wildcards and by specifying the nesting levels for which those filters should work
 - failures can (optionally) break into the debugger on Windows and Mac
 - integration with the output window of Visual Studio for failing tests
 - a ```main()``` can be provided when implementing the library with the [**```DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN```**](main.html#doctest_config_implement_with_main) identifier
 - can write tests in headers - they will still be registered only once in the executable/shared object
 - [**range-based**](commandline.html) execution of tests - see the [**example python script**](../../examples/range_based_execution.py)
 - colored output in the console
 - controlling the order of test execution
 - different ```doctest::Context```s can be created and ran many times within a single execution of the program
 - ability to query if code is currently being ran in a test -  ```doctest::is_running_in_test```

 There is a list of planned features which are all important and big - see the [**roadmap**](roadmap.html).

 ---------------

 [Home](readme.html#reference)

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	## Features and design goals

	doctest has been designed from the start to be as light and unintrusive as possible. These key features should be kept.

	## Unintrusive (transparent):

	- everything testing-related can be removed from the binary executable by defining the [```DOCTEST_CONFIG_DISABLE```](configuration.html#doctest_config_disable) identifier
	- very small and easy to integrate - single header
	- Extremely low footprint on compile times - [around 25ms](benchmarks.html#cost-of-including-the-header) of compile time overhead for including the header in a file
	- The [fastest possible](benchmarks.html#cost-of-an-assertion-macro) assertion macros - 50k asserts can compile for under 30 seconds (even under 10 sec)
	- doesn't drag any headers when included (except for in the translation unit where the library gets implemented)
	- everything is in the ```doctest``` namespace (and the implementation details are in a nested ```detail``` namespace)
	- all macros have prefixes - some by default have unprefixed versions as well but that is optional - see [configuration](configuration.html)
	- 0 warnings even with the most aggresive flags (on all tested compilers!!!)
	- ```-Weverything -pedantic``` for clang
	- ```-Wall -Wextra -pedantic``` and >> over 35 << other warnings not covered by these flags for GCC!!! - see [here](../../scripts/cmake/common.cmake#L84)
	- ```/Wall``` for MSVC (except for: ```C4514```, ```C4571```, ```C4710```, ```C4711```)
	- doesn't error on unrecognized [command line](commandline.html) options and supports prefixes for interop with client command line parsing
	- can set options [procedurally](main.html) and not deal with passing ```argc```/```argv``` from the command line
	- doesn't leave warnings disabled after itself

	## Extremely portable:

	- Standards compliant C++11 code - should work with any C++11 capable compiler (use tag [1.2.9](https://github.com/onqtam/doctest/tree/1.2.9) for C++98 and older compilers)
	- tested with GCC: 4.8, 4.9, 5, 6, 7, 8
	- tested with Clang: 3.5, 3.6, 3.7, 3.8, 3.9, 4, 5, 6 (XCode 8+)
	- tested with MSVC: 2015, 2017 (also in 32 bit mode)
	- per-commit tested on [travis](https://travis-ci.org/onqtam/doctest) and [appveyor](https://ci.appveyor.com/project/onqtam/doctest) CI services
	- warnings as errors even on the most aggressive warning levels - see [here](../../scripts/cmake/common.cmake#L84)
	- statically analyzed on the CI - [Cppcheck](http://cppcheck.sourceforge.net/) / [Clang-Tidy](http://oclint.org/) / [Coverity Scan](https://scan.coverity.com/) / [OCLint](https://scan.coverity.com/) / [Visual Studio Analyzer](https://docs.microsoft.com/en-us/visualstudio/code-quality/analyzing-c-cpp-code-quality-by-using-code-analysis)
	- all tests have their output compared to reference output of a previous known good run
	- all tests built and ran in Debug/Release modes
	- all tests ran through valgrind under Linux (sadly [not under OSX](https://github.com/onqtam/doctest/issues/11))
	- all tests ran through address, UB and thread sanitizers under Linux/OSX
	- tests are ran in more than 168 different configurations on UNIX (Linux + OSX) on travis CI
	- tests are ran in a total of 10 different configurations on Windows on appveyor CI

	## Other features:

	- really easy to get started - it's just 1 header file - see the [tutorial](tutorial.html)
	- very light, unintrusive and portable - see the sections above - and also the [benchmarks](benchmarks.html)
	- offers a way to remove everything testing-related from the binary with the [```DOCTEST_CONFIG_DISABLE```](configuration.html#doctest_config_disable) macro
	- tests are registered automatically - no need to add them to a collection manually
	- [Subcases](tutorial.html#test-cases-and-subcases) - an intuitive way to share common setup and teardown code for test cases (alternative to [test fixtures](testcases.html#test-fixtures) which are also supported)
	- [templated test cases](parameterized-tests.html#templated-test-cases---parameterized-by-type) - parameterized by type
	- supports [logging macros](logging.html) for capturing local variables and strings - as a message for when an assert fails - with lazy stringification and no allocations when possible!
	- crash handling support - uses signals for UNIX and SEH for Windows
	- [thread-safe](faq.html#is-doctest-thread-aware) - asserts (and logging) can be used from multiple threads spawned from a single test case - [example](../../examples/all_features/concurrency.cpp)
	- an extensible [reporter system](reporters.html) (can be also used for implementing event listeners)
	- output from all compilers on all platforms is the same - byte by byte
	- binaries (exe/dll) can use the test runner of another binary - so tests end up in a single registry - [example](../../examples/executable_dll_and_plugin/)
	- supports [BDD style](testcases.html) tests
	- one core [assertion macro](assertions.html) for comparisons - standard C++ operators are used for the comparison (less than, equal, greater than...) - yet the full expression is decomposed and left and right values of the expression are logged
	- asserts can be used [outside of a testing context](assertions.html#using-asserts-out-of-a-testing-context) - [example](../../examples/all_features/asserts_used_outside_of_tests.cpp)
	- assertion macros for [exceptions](assertions.html#exceptions) - if something should or shouldn't throw
	- floating point comparison support - see the [```Approx()```](assertions.html#floating-point-comparisons) helper
	- powerful mechanism for [stringification](stringification.html) of user types - including [exceptions](stringification.html#translating-exceptions)!
	- tests can be grouped in [test suites](testcases.html#test-suites)
	- test case [decorators](testcases.html#decorators) such as ```description``` / ```skip``` / ```may_fail``` / ```should_fail``` / ```expected_failures``` / ```timeout```
	- can be used without exceptions and rtti - checkout [```DOCTEST_CONFIG_NO_EXCEPTIONS```](configuration.html#doctest_config_no_exceptions)
	- powerful [command line](commandline.html) with lots of options
	- can report the duration of test cases
	- tests can be [filtered](commandline.html) based on their name/file/test suite using wildcards
	- can [filter](commandline.html) subcases using wildcards and by specifying the nesting levels for which those filters should work
	- failures can (optionally) break into the debugger on Windows and Mac
	- integration with the output window of Visual Studio for failing tests
	- a ```main()``` can be provided when implementing the library with the [```DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN```](main.html#doctest_config_implement_with_main) identifier
	- can write tests in headers - they will still be registered only once in the executable/shared object
	- [range-based](commandline.html) execution of tests - see the [example python script](../../examples/range_based_execution.py)
	- colored output in the console
	- controlling the order of test execution
	- different ```doctest::Context```s can be created and ran many times within a single execution of the program
	- ability to query if code is currently being ran in a test - ```doctest::is_running_in_test```

	There is a list of planned features which are all important and big - see the [roadmap](roadmap.html).

	---------------

	[Home](readme.html#reference)

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