TestAsyncUtils class
Utility class for all the async APIs in the flutter_test library.
This class provides checking for asynchronous APIs, allowing the library to
verify that all the asynchronous APIs are properly awaited before calling
another.
For example, it prevents this kind of code:
tester.pump(); // forgot to call "await"!
tester.pump();
...by detecting, in the second call to pump, that it should actually be:
await tester.pump();
await tester.pump();
It does this while still allowing nested calls, e.g. so that you can call expect from inside callbacks.
You can use this in your own test functions, if you have some asynchronous functions that must be used with "await". Wrap the contents of the function in a call to TestAsyncUtils.guard(), as follows:
Future<void> myTestFunction() => TestAsyncUtils.guard(() async {
// ...
});
Properties
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
-
toString(
) → String -
Returns a string representation of this object.
inherited
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
inherited
Static Methods
-
guard<
T>( Future< T> body()) → Future< T> - Calls the given callback in a new async scope. The callback argument is the asynchronous body of the calling method. The calling method is said to be "guarded". Nested calls to guarded methods from within the body of this one are fine, but calls to other guarded methods from outside the body of this one before this one has finished will throw an exception. [...]
-
guardSync(
) → void - Verifies that there are no guarded methods currently pending (see guard). [...]
-
verifyAllScopesClosed(
) → void - Verifies that there are no guarded methods currently pending (see guard). [...]