Add tests for xoptions (#109)

Author: tharun571

include/xeus-cpp/xoptions.hpp

@@ -23,6 +23,7 @@ namespace xcpp
         using base_type = argparse::ArgumentParser;
         using base_type::ArgumentParser;
 
+        XEUS_CPP_API
         void parse(const std::string& line);
     };
 }

test/test_interpreter.cpp

@@ -11,6 +11,7 @@
 #include "xeus-cpp/xholder.hpp"
 #include "xeus-cpp/xmanager.hpp"
 #include "xeus-cpp/xutils.hpp"
+#include "xeus-cpp/xoptions.hpp"
 
 #include "../src/xparser.hpp"
 
@@ -396,3 +397,32 @@ TEST_SUITE("xbuffer")
         REQUIRE(null_stream.good() == true);
     }
 }
+
+TEST_SUITE("xotions")
+{
+    TEST_CASE("good_status") {
+        xcpp::argparser parser("test");
+        parser.add_argument("--verbose").help("increase output verbosity").default_value(false).implicit_value(true);
+        std::string line = "./main --verbose";
+
+        parser.parse(line);
+
+        REQUIRE(parser["--verbose"] == true);
+    } 
+
+    TEST_CASE("bad_status") {
+        xcpp::argparser parser("test");
+        parser.add_argument("--verbose");
+        std::string line = "./main --verbose";
+
+        parser.parse(line);
+
+        bool exceptionThrown = false;
+        try {
+            bool isVerbose = (parser["--verbose"] == false);
+        } catch (const std::exception& e) {
+            exceptionThrown = true;
+        }
+        REQUIRE(exceptionThrown);
+    }
+}