dart-checks-migration

import 'package:test/scaffolding.dart'; ONLY after all expect calls are replaced. This ensures incremental progress.

| expect(a, equals(b)) | check(a).equals(b) | | expect(a, isTrue) | check(a).isTrue() | | expect(a, isFalse) | check(a).isFalse() | | expect(a, isNull) | check(a).isNull() | | expect(a, isNotNull) | check(a).isNotNull() | | expect(() => fn(), throwsA ()) | check(() => fn()).throws () | | expect(list, hasLength(n)) | check(list).length.equals(n) |

| expect(a, closeTo(b, delta)) | check(a).isA ().isCloseTo(b, delta) | | expect(a, greaterThan(b)) | check(a).isGreaterThan(b) | | expect(a, lessThan(b)) | check(a).isLessThan(b) | | expect(list, isEmpty) | check(list).isEmpty() | | expect(list, isNotEmpty) | check(list).isNotEmpty() | | expect(list, contains(item)) | check(list).contains(item) |

Replace the usage of `expect` and similar functions from `package:matcher` to `package:checks` equivalents. Source: kevmoo/dash_skills.