Added test cases for 'as' prefix

Author: Napalys

ql/ql/test/queries/style/ValidatePredicateGetReturns/ValidatePredicateGetReturns.expected

@@ -1,2 +1,3 @@
 | test.qll:4:11:4:18 | ClasslessPredicate getValue | This predicate starts with 'get' but does not return a value. |
 | test.qll:25:11:25:28 | ClasslessPredicate getImplementation2 | This predicate starts with 'get' but does not return a value. |
+| test.qll:31:11:31:17 | ClasslessPredicate asValue | This predicate starts with 'get' but does not return a value. |

ql/ql/test/queries/style/ValidatePredicateGetReturns/test.qll

@@ -26,3 +26,12 @@ predicate getImplementation2() { none() }
 
 // OK -- is an alias
 predicate getAlias2 = getImplementation2/0;
+
+// NOT OK -- starts with as and does not return value
+predicate asValue() { none() }
+
+// OK -- starts with as but followed by a lowercase letter, probably should be ignored
+predicate assessment() { none() }
+
+// OK -- starts with as and returns a value
+string asString() { result = "string" }