Option: Test Coverage

Add unit tests for `auxiliary::Option`

test/AuxiliaryTest.cpp

@@ -9,6 +9,7 @@
 #include "openPMD/backend/Container.hpp"
 #include "openPMD/auxiliary/DerefDynamicCast.hpp"
 #include "openPMD/auxiliary/Filesystem.hpp"
+#include "openPMD/auxiliary/Option.hpp"
 #include "openPMD/auxiliary/StringManip.hpp"
 #include "openPMD/auxiliary/Variant.hpp"
 #include "openPMD/IO/AbstractIOHandler.hpp"
@@ -43,6 +44,33 @@ struct TestHelper : public Attributable
 } // openPMD
 
 
+TEST_CASE( "optional", "[auxiliary]" ) {
+    using namespace auxiliary;
+
+    Option<int> opt;
+
+    REQUIRE_THROWS(opt.get());
+    REQUIRE_THROWS(opt.get() = 42);
+    REQUIRE(!opt);
+    REQUIRE(!opt.has_value());
+
+    opt = 43;
+    REQUIRE(opt);
+    REQUIRE(opt.has_value());
+    REQUIRE(opt.get() == 43);
+
+    Option<int> opt2{ opt };
+    REQUIRE(opt2);
+    REQUIRE(opt2.has_value());
+    REQUIRE(opt2.get() == 43);
+
+    Option<int> opt3 = makeOption( 3 );
+    REQUIRE(opt3);
+    REQUIRE(opt3.has_value());
+    REQUIRE(opt3.get() == 3);
+}
+
+
 TEST_CASE( "deref_cast_test", "[auxiliary]" ) {
     using namespace auxiliary;