Quick Test

---

It provides the same feeling with using Quick in swift

import 'package:flutter_test/flutter_test.dart';
import 'package:quick_test/quick_test.dart';

void main() {
  describe("the 'Documentation' directory", () {
    it("has everything you need to get started", () {
      final sections = Directory("Documentation").sectionsexpect(
          sections, contains("Organized Tests with Quick Examples and Example Groups"));
      expect(sections, contains("Installing Quick"));
    });

    context("if it doesn't have what you're looking for", () {
      it("needs to be updated", () {
        final you = You(awesome: true);
        expect(you.submittedAnIssue, isTrue);
      });
    });
  });
}

Usage

Examples Using it

Examples, defined with the it function, use assertions to demonstrate how code should behave. These are like test methods in flutter_test.

it takes two parameters: the name of the example, and a function. The examples below specify how the Sea.Dolphin class should behave. A new dolphin should be smart and friendly:

import 'package:flutter_test/flutter_test.dart';
import 'package:quick_test/quick_test.dart';

void main() {
  it("is friendly", () {
    expect(Dolphin().isFriendly, isTrue);
  });

  it("is smart", () {
    expect(Dolphin().isSmart, isTrue);
  });
}

Example Groups Using describe and context

Example groups are logical groupings of examples. Example groups can share setup and teardown code.

Describing Classes and Methods Using describe

To specify the behavior of the Dolphin class's click method--in other words, to test the method works--several it examples can be grouped together using the describe function. Grouping similar examples together makes the spec easier to read:

import 'package:flutter_test/flutter_test.dart';
import 'package:quick_test/quick_test.dart';

void main() {
  describe("a dolphin",() {
    describe("its click", () {
      it("is loud", () {
        final click = Dolphin().click();
        expect(click.isLoud, isTrue);
      });

      it("has a high frequency", () {
        final click = Dolphin().click();
        expect(click.hasHighFrequency, isTrue);
      });
    });
  });
}

Sharing Setup/Teardown Code Using beforeEach and afterEach

Example groups don't just make the examples clearer, they're also useful for sharing setup and teardown code among examples in a group.

In the example below, the beforeEach function is used to create a brand new instance of a dolphin and its click before each example in the group. This ensures that both are in a "fresh" state for every example:

import 'package:flutter_test/flutter_test.dart';
import 'package:quick_test/quick_test.dart';

void main() {
  describe("a dolphin", () {
    Dolphin dolphin;
    beforeEach(() {
      dolphin = Dolphin();
    });

    describe("its click", () {
      Click click;
      beforeEach(() {
        click = dolphin.click();
      });

      it("is loud", () {
        expect(click.isLoud, isTrue);
      });

      it("has a high frequency", () {
        expect(click.hasHighFrequency, isTrue);
      });
    });
  });
}

Sharing setup like this might not seem like a big deal with the dolphin example, but for more complicated objects, it saves a lot of typing!

To execute code after each example, use afterEach.

Specifying Conditional Behavior Using context

Dolphins use clicks for echolocation. When they approach something particularly interesting to them, they release a series of clicks in order to get a better idea of what it is.

The tests need to show that the click method behaves differently in different circumstances. Normally, the dolphin just clicks once. But when the dolphin is close to something interesting, it clicks several times.

This can be expressed using context functions: one context for the normal case, and one context for when the dolphin is close to something interesting:

import 'package:flutter_test/flutter_test.dart';
import 'package:quick_test/quick_test.dart';
import 'package:mockito/mockito.dart';

void main() {
  describe("a dolphin", () {
    Dolphin dolphin;
    beforeEach(() {
      dolphin = Dolphin();
    });

    describe("its click", () {
      context("when the dolphin is not near anything interesting", () {
        it("is only emitted once", () {
          verify(dolphin.click()).called(1);
        });
      });

      context("when the dolphin is near something interesting", () {
        beforeEach(() {
          final ship = SunkenShip();
          Jamaica.dolphinCove.add(ship);
          Jamaica.dolphinCove.add(dolphin);
        });

        it("is emitted three times", () {
          verify(dolphin.click()).called(3);
        });
      });
    });
  });
}

Test vs Widget Test

• Import quick_test.dart when writing test and quick_widget_test.dart for widget test
• In Wiget Test: beforeEach, afterEach, itare included a widget tester

import 'package:flutter_test/flutter_test.dart';
import 'package:quick_test/quick_widget_test.dart';

void main() {
  describe("a message widget", () {
    beforeEach((tester) async {
      await tester.pumpWidget(MessageWidget("a message"));
    });

    it("shows a message", (tester) async {
      expect(find.text("a message"), findsOneWidget);
    });
  });
}