How to test not equal with matcher in flutter

Question

I'm doing testing on render objects in Flutter. I'd like to check for inequality like this (simplified):

testWidgets('render object heights not equal', (WidgetTester tester) async {    final renderObjectOneHeight = 10;   final renderObjectTwoHeight = 11;    expect(renderObjectOneHeight, notEqual(renderObjectTwoHeight)); }); 

I made up notEqual because it doesn't exist. This doesn't work either:

• !equals

I found a solution that works so I am posting my answer below Q&A style. I welcome any better solutions, though.

Answer 1

You can use isNot() to negate the equals() matcher.

final x = 1; final y = 2;  expect(x, isNot(equals(y))); 

Or as mentioned in the comments:

expect(x != y, true) 

That actually seems a bit more readable to me.