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# Exhaustive and Randomized Testing

A library for exhaustive and randomized testing of Dart properties, based on enumerators. It is inspired by Haskell's smallcheck and quickcheck. If you don't know these libraries, have a look at the small demo below to get an idea of what it can be useful for. I also wrote a post that goes into more details.

## Documentation

The only documentation so far is this README and the API reference.

## Quick Start

``````import 'dart:collection';
import 'package:propcheck/propcheck.dart';
import 'package:enumerators/combinators.dart' as c;
import 'package:unittest/unittest.dart';

// defines append and reverse
part 'demolib.dart';

/* --- the properties to test --- */

// this should always hold
bool good(List xs, List ys) =>
equals(reverse(append(xs, ys)),
append(reverse(ys), reverse(xs)));

// this should NOT always hold
bool bad(List xs, List ys) =>
equals(reverse(append(xs, ys)),
append(reverse(xs), reverse(ys)));

/* --- how we test them --- */

main() {
// we define an enumeration of lists of integers
final boolsLists = c.listsOf(c.bools);

// 'good' and 'bad' take 2 arguments each so we use forall2
Property goodProperty = forall2(boolsLists, boolsLists, good);

// we test the properties against *every* pair of lists of bools whose
// combined size is <= 10.
group('smallcheck', () {
final sc = new SmallCheck(depth: 10);
test('good', () => sc.check(goodProperty));
});

// we test the properties against random pairs of lists of bools of
// combined size 0, 1, ..., 300.
group('quickcheck', () {
final qc = new QuickCheck(maxSize: 300, seed: 42);
test('good', () => qc.check(goodProperty));
});
}
``````

Output:

``````unittest-suite-wait-for-done
PASS: smallcheck good
Caught falsified after 11 tests
argument 1: [true]
argument 2: [false]

[...]

PASS: quickcheck good
Caught falsified after 5 tests
argument 1: [false]
argument 2: [false, false, true]

[...]

2 PASSED, 2 FAILED, 0 ERRORS
``````

## Try it!

``````git clone https://github.com/polux/propcheck
cd propcheck
pub install
dart example/demo.dart
``````

Enjoy the progress indicator, probably the most elaborate part of this library :)

# Propcheck Changlelog

## 0.5.1

• Move run_all_tests.sh to tests/run.sh to adhere to pub.drone.io's conventions

## 0.5.0

• Added experimental `propcheck_mirrors` library

## Use this package as a library

### 1. Depend on it

Add this to your package's pubspec.yaml file:

``````
dependencies:
propcheck: ^0.6.0

``````

### 2. Install it

You can install packages from the command line:

with pub:

``````
\$ pub get

``````

with Flutter:

``````
\$ flutter packages get

``````

Alternatively, your editor might support `pub get` or `flutter packages get`. Check the docs for your editor to learn more.

### 3. Import it

Now in your Dart code, you can use:

``````
import 'package:propcheck/propcheck.dart';
``````
Version Uploaded Documentation Archive
0.6.0 Mar 2, 2018
0.5.1 Sep 18, 2014
0.5.0 May 31, 2014
0.4.0 Nov 8, 2013
0.3.5 Oct 4, 2013
0.3.4 Oct 3, 2013
0.3.3 Oct 3, 2013
0.3.2 Oct 1, 2013
0.3.1 May 29, 2013
0.3.0 Apr 16, 2013
 Popularity: Describes how popular the package is relative to other packages. [more] 29 Health: Code health derived from static analysis. [more] 98 Maintenance: Reflects how tidy and up-to-date the package is. [more] 80 Overall: Weighted score of the above. [more] 60

We analyzed this package on Jul 20, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

• Dart: 2.0.0-dev.69.0
• pana: 0.11.7

#### Platforms

Detected platforms: Flutter, other

Primary library: `package:propcheck/propcheck.dart` with components: `io`.

#### Issues and suggestions

Support Dart 2 in `pubspec.yaml`.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see https://www.dartlang.org/dart-2#migration.

Package is pre-v1 release.

While there is nothing inherently wrong with versions of `0.*.*`, it usually means that the author is still experimenting with the general direction of the API.

Format `lib/propcheck.dart`.

Run `dartfmt` to format `lib/propcheck.dart`.

Format `lib/propcheck_mirrors.dart`.

Run `dartfmt` to format `lib/propcheck_mirrors.dart`.

Format `lib/src/random.dart`.

Run `dartfmt` to format `lib/src/random.dart`.

Maintain an example.

None of the files in your `example/` directory matches a known example patterns. Common file name patterns include: `main.dart`, `example.dart` or you could also use `propcheck.dart`.

#### Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.21.0 <2.0.0
enumerators >=0.6.0 <0.7.0 0.6.0
Transitive dependencies
rational 0.3.0
Dev dependencies
collection >=0.9.3 <0.10.0
unittest >=0.9.0 <0.10.0