tests: normalize dashes to ' - ' so whitespace collapse yields expected spacing

Author: arnabwahid

RomanNormalizer.m

@@ -32,7 +32,7 @@ + (NSString *)normalize:(NSString *)input {
     NSDictionary *punct = @{
         @"“": @"\"", @"”": @"\"",
         @"‘": @"'",  @"’": @"'",
-        @"–": @"-",   @"—": @"-",
+        @"–": @" - ",   @"—": @" - ",
         @"…": @"..."
     };
     for (NSString *k in punct) {