Switch to using Catch for testing

[Vraiment]

As I commented in another issue I would suggest switching to Catch it works kind of the same way as the custom framework libSDL2pp uses for testings but has several cool features like:

• Naming and tagging the test cases
• Control test executing and output features (like coloring and format) via arguments
• Reuse test code by leveraging the stack, silly example:

TEST_CASE("Test modifying the string", "[std_containers][modifying_operators]") {
	std::string testString = "Some string";
	SECTION("Test concatenation") {
		REQUIRE(testString + " extra" == "Some string extra")
	}
	SECTION("Test push_back") {
		REQUIRE(testString.push_back('.') == "Some string.")
	}
}

[vladimirgamalyan]

one another alternative: https://github.com/onqtam/doctest

[Vraiment]

I advised Catch because is the one I know, after going quickly through doctest's documentation it seems it has several small extra features (like convenient assertion macros).

From a quick search in google it seems that Catch is more mature than doctest and just slightly slower than Catch. The other important difference is Catch uses the BOOST license and doctest uses the MIT license.

[AMDmi3]

I like the idea. It should probably be more robust than my homegrown library. Gotta investigate it.