strategy_test.dart

import 'package:test/test.dart';

class TestSubject {
  final double pupilDiameter;
  final double blushResponse;
  final bool isOrganic;

  TestSubject({
    required this.pupilDiameter,
    required this.blushResponse,
    required this.isOrganic,
  });
}

abstract class RealnessTesting {
  bool testRealness(TestSubject testSubject);
}

class VoightKampffTest implements RealnessTesting {
  @override
  bool testRealness(TestSubject testSubject) {
    return testSubject.pupilDiameter < 30.0 || testSubject.blushResponse != 0.0;
  }
}

class GeneticTest implements RealnessTesting {
  @override
  bool testRealness(TestSubject testSubject) {
    return testSubject.isOrganic;
  }
}

class BladeRunner {
  final RealnessTesting _strategy;

  BladeRunner(this._strategy);

  bool testIfAndroid(TestSubject testSubject) {
    return !_strategy.testRealness(testSubject);
  }
}

void main() {
  TestSubject rachel = TestSubject(
    pupilDiameter: 30.2,
    blushResponse: 0.3,
    isOrganic: false,
  );

  test("Deckard's method should return false for Rachel", () {
    // given
    BladeRunner deckard = BladeRunner(VoightKampffTest());

    // when
    bool isRachelAndroid = deckard.testIfAndroid(rachel);

    // then
    expect(isRachelAndroid, isFalse);
  });

  test("Gaff's method should return true for Rachel", () {
    // given
    BladeRunner gaff = BladeRunner(GeneticTest());

    // when
    bool isRachelAndroid = gaff.testIfAndroid(rachel);

    // then
    expect(isRachelAndroid, isTrue);
  });
}