Add 'class' features tag

test/built-ins/Promise/prototype/then/capability-executor-called-twice.js

@@ -20,6 +20,7 @@ info: >
     5. Set promiseCapability.[[Resolve]] to resolve.
     6. Set promiseCapability.[[Reject]] to reject.
     ...
+features: [class]
 ---*/
 
 var constructorFunction;

test/built-ins/Promise/prototype/then/capability-executor-not-callable.js

@@ -22,6 +22,7 @@ info: >
     8. If IsCallable(promiseCapability.[[Resolve]]) is false, throw a TypeError exception.
     9. If IsCallable(promiseCapability.[[Reject]]) is false, throw a TypeError exception.
     ...
+features: [class]
 ---*/
 
 var constructorFunction;

test/built-ins/Promise/prototype/then/deferred-is-resolved-value.js

@@ -33,6 +33,7 @@ info: >
     ...
     8. Let status be Call(promiseCapability.[[Resolve]], undefined, «handlerResult.[[value]]»).
     9. NextJob Completion(status).
+features: [class]
 ---*/
 
 var createBadPromise = false;