Add tests in GenericExpressionEvaluator_ConditionalIT

Signed-off-by: Craig Perkins <cwperx@amazon.com>

Author: cwperks

data-prepper-expression/src/main/antlr/DataPrepperExpression.g4

@@ -182,6 +182,7 @@ literal
     | Integer
     | Boolean
     | String
+    | RawString
     | Null
     ;
 

data-prepper-expression/src/test/java/org/opensearch/dataprepper/expression/GenericExpressionEvaluator_ConditionalIT.java

@@ -192,6 +192,8 @@ private static Stream<Arguments> validExpressionArguments() {
                 arguments("/should_drop", event("{\"should_drop\": true}"), true),
                 arguments("/should_drop", event("{\"should_drop\": false}"), false),
                 arguments("/logs/2/should_drop", event("{\"logs\": [{}, {}, {\"should_drop\": true}]}"), true),
+                arguments("/path == " + rawString("/path/to/route"), event("{\"path\": \"/path/to/route\"}"), true),
+                arguments("/path == " + rawString("/path/to/route"), event("{\"path\": \"/incorrect/path\"}"), false),
                 arguments(
                         escapedJsonPointer(ALL_JACKSON_EVENT_GET_SUPPORTED_CHARACTERS) + " == true",
                         complexEvent(ALL_JACKSON_EVENT_GET_SUPPORTED_CHARACTERS, true),
@@ -352,6 +354,10 @@ private static String escapedJsonPointer(final String pointer) {
         return "\"/" + pointer + "\"";
     }
 
+    private static String rawString(final String original) {
+        return "r\"" + original + "\"";
+    }
+
     private static Event event(final String data) {
         return JacksonEvent.builder().withEventType("event").withData(data).build();
     }