#1243 Runtime type checks added to Expect class
diff --git a/Utils/expect_common.dart b/Utils/expect_common.dart
index 4af927e..5427150 100644
--- a/Utils/expect_common.dart
+++ b/Utils/expect_common.dart
@@ -292,6 +292,43 @@
}
Expect.isFalse(actIterator.moveNext());
}
+
+ /// Checks that [obj] object is of the type [T] or not.
+ static void _checkIs<T>(bool expected, Object? obj) {
+ Expect.equals(expected, obj is T);
+ }
+
+ /// Call this function with `checkIs` as the first parameter to check the type
+ /// to prevent the compiler reducing the code to the answer. Otherwise, dart2js
+ /// compiler may optimize `Expect.isTrue(c is C)` to `Expect_isTrue(true)`
+ @pragma('dart2js:noInline')
+ static void _checkType(void Function(bool, Object?) checker, bool expected, Object? o) {
+ checker(expected, o);
+ }
+
+ /// Call this function to perform runtime type check. Sometimes compiler (for
+ /// example dart2js or AOT) optimizes
+ /// `Expect.isTrue(c is C)` to `Expect_isTrue(true)`
+ /// If you want to test not only compiler optimization but runtime as well the
+ /// use
+ /// ```dart
+ /// Expect.isTrue(c is C);
+ /// Expect.runtimeIsType<C>(c);
+ static void runtimeIsType<T>(Object? o) {
+ _checkType(_checkIs<T>, true, o);
+ }
+
+ /// Call this function to perform runtime type check. Sometimes compiler (for
+ /// example dart2js or AOT) optimizes
+ /// `Expect.isFalse(c is C)` to `Expect_isFalse(false)`
+ /// If you want to test not only compiler optimization but runtime as well the
+ /// use
+ /// ```dart
+ /// Expect.isFalse(c is C);
+ /// Expect.runtimeIsNotType<C>(c);
+ static void runtimeIsNotType<T>(Object? o) {
+ _checkType(_checkIs<T>, false, o);
+ }
}
bool _identical(a, b) => identical(a, b);
@@ -330,7 +367,8 @@
}
/// Call this function with `checkIs` as the first parameter to check the type
-/// to prevent the compiler reducing the code to the answer
+/// to prevent the compiler reducing the code to the answer. Otherwise, dart2js
+/// compiler may optimize `Expect.isTrue(c is C)` to `Expect_isTrue(true)`
@pragma('dart2js:noInline')
void checkType(void Function(bool, Object?) checker, bool expected, Object? o) {
checker(expected, o);
