Added mime_bundle_repr test

Author: JohanMabille

test/test_interpreter.cpp

@@ -1079,3 +1079,17 @@ TEST_SUITE("file") {
         infile.close();
     }
 }
+
+TEST_SUITE("mime_bundle_repr")
+{
+    TEST_CASE("int")
+    {
+        int value = 42;
+        nl::json res = xcpp::mime_bundle_repr(value);
+        nl::json expected = {
+            {"text/plain", "42"}
+        };
+
+        REQUIRE(res == expected);
+    }
+}