add doctest package

packages/d/doctest/xmake.lua

@@ -0,0 +1,27 @@
+package("doctest")
+
+    set_homepage("http://bit.ly/doctest-docs")
+    set_description("The fastest feature-rich C++11/14/17/20 single-header testing framework for unit tests and TDD")
+
+    set_urls("https://github.com/onqtam/doctest/archive/$(version).tar.gz",
+             "https://github.com/onqtam/doctest.git")
+
+    add_versions("2.3.1", "b3d3c6133874e3a8c8e319cab33167156b6b1d2ed1ddde08c2655193cdeb58a0")
+
+    on_install(function (package)
+        os.cp("doctest", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        import("lib.detect.check_cxsnippets")
+        assert(check_cxsnippets({test = [[
+            int factorial(int number) { return number <= 1 ? number : factorial(number - 1) * number; }
+
+            TEST_CASE("testing the factorial function") {
+                CHECK(factorial(1) == 1);
+                CHECK(factorial(2) == 2);
+                CHECK(factorial(3) == 6);
+                CHECK(factorial(10) == 3628800);
+            }
+        ]]}, {configs = table.join(package:fetch(), {languages = "c++11"}), sourcekind = "cxx", includes = "doctest/doctest.h", defines = "DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN"}))
+    end)