Add unittest for parsing function declaration

Author: luckyrandom

inst/unitTests/cpp/attributes.cpp

@@ -10,3 +10,10 @@ std::string comments_test( /// // "\""" some '"// more / // ///garbge"
 ) { // """
     return msg;
 }
+
+std::string parse_declaration_test(std::string msg) {
+    return msg;
+}
+
+// [[Rcpp::export]]
+std::string parse_declaration_test(std::string msg = "Parse function declaration");

inst/unitTests/runit.attributes.R

@@ -28,6 +28,10 @@ if (.runThisTest) {
             comments_test(),
             "Start a C++ line comment with the characters \"//\""
         )
+        checkEquals(
+            parse_declaration_test(),
+            "Parse function declaration"
+        )
     }
 
 }