Add test for optional

tests/CMakeLists.txt

@@ -2,6 +2,7 @@
 SET(CLI_TESTS
 	test_pointrect
 	test_rwops
+	test_optional
 )
 
 # tests which test graphics functionality and thus requre working

tests/test_optional.cc

@@ -0,0 +1,83 @@
+#include <string>
+
+#include <SDL2pp/Optional.hh>
+
+#include "testing.h"
+
+using namespace SDL2pp;
+
+BEGIN_TEST()
+	// Engage/disengage
+	{
+		Optional<int> o;
+		int i;
+
+		// disengaged
+		EXPECT_TRUE((bool)!o);
+
+		// accessing disengaged fails
+		EXPECT_EXCEPTION(i = o.value(), BadOptionalAccess);
+		EXPECT_EXCEPTION(i = o.value(), std::logic_error);
+
+		// value_or test
+		EXPECT_EQUAL(i = o.value_or(234), 234);
+
+		// engage
+		o = 123;
+
+		// engaged
+		EXPECT_TRUE((bool)o);
+
+		// accessing value
+		EXPECT_EQUAL(o.value(), 123);
+
+		// disengage
+		o = NullOpt;
+
+		EXPECT_TRUE((bool)!o);
+	}
+
+	// Equality
+	{
+		Optional<int> o1, o2;
+
+		EXPECT_TRUE(o1 == o2);
+		EXPECT_TRUE(o1 == NullOpt);
+		EXPECT_TRUE(NullOpt == o1);
+
+		o1 = 123;
+
+		EXPECT_TRUE(!(o1 == o2));
+
+		o2 = 124;
+
+		EXPECT_TRUE(!(o1 == o2));
+
+		o2 = 123;
+
+		EXPECT_TRUE(o1 == o2);
+	}
+
+	// Swap
+	{
+		Optional<int> o1, o2;
+
+		o1 = 123;
+
+		EXPECT_TRUE(!o2);
+		EXPECT_TRUE((bool)o1);
+		EXPECT_TRUE(o1 == 123);
+
+		std::swap(o1, o2);
+
+		EXPECT_TRUE(!o1);
+		EXPECT_TRUE((bool)o2);
+		EXPECT_TRUE(o2 == 123);
+
+		o1.swap(o2);
+
+		EXPECT_TRUE(!o2);
+		EXPECT_TRUE((bool)o1);
+		EXPECT_TRUE(o1 == 123);
+	}
+END_TEST()