Google test, how to use template in test code, to check types

I am trying to write a unit test case for the below function.

SQLSMALLINT type_conversion_fn(InputType xtype) {
    switch (xtype) {
    case XSQL_String:        
        return SQL_TINYINT;

    default:
        return SQL_WVARCHAR;
    }
}

So my google test file:

#include "gtest/gtest.h"
#include "blabla.hh"

InputType xsql_type;

TEST(xsql, test_type_conversion_fn) {
    SQLSMALLINT result;
    inputType = XSQL_String;
    result = type_conversion_fn(inputType);
    EXPECT_TRUE(::testing::StaticAssertTypeEq<SQL_WVARCHAR, result>());

}

I am getting too many errors... The template function is in the documentation http://ift.tt/1BkJ8UE

I think for the unit testing, I need to check for the return type matches? So I looked for assert type, and reached the google documentation link. But I do not know how to apply it to my code... Please help. Thank you.