public void SingletonTotalPopulationTest()
{
var rf = new SingletonRecordFinder();
var names = new[] { "Seoul", "Mexico City" };
int tp = rf.GetTotalPopulation(names);
Assert.AreEqual(17500000 + 17400000, tp);
}
public void SingletonTotalPopulationTest()
{
var rf = new SingletonRecordFinder();
var names = new[] { "Seoul", "New York" };
int tp = rf.GetTotalPopulation(names);
Assert.That(tp, Is.EqualTo(17800000 + 17500000));
}
public void SingletonTotalPopulationTest()
{
// testing on a live database
var rf = new SingletonRecordFinder();
var names = new[] { "Seoul", "Mexico City" };
int tp = rf.TotalPopulation(names);
Assert.That(tp, Is.EqualTo(17500000 + 17400000));
}
public void SingletonTotalPopulationTest()
{
var recordFinder = new SingletonRecordFinder();
var names = new[] { "New Delhi", "Beijing" };
var totalPopulations = recordFinder.TotalPopulation(names);
Assert.That(totalPopulations, Is.EqualTo(21542000 + 14200004));
}
public void ConfigurablePopulationTest()
{
SingletonRecordFinder singletonRecordFinder = new SingletonRecordFinder();
int population = singletonRecordFinder.GetTotalPopulation(new List <string>()
{
"Seoul", "Tokyo"
});
Assert.AreEqual(33200000 + 17500000, population);
}
public void SingletonTotalPopulationTest()
{
// Singleton database is used as live (production) database test
// data of live database may changed by user
// so we need to create another database for test environment
var rf = new SingletonRecordFinder();
var names = new[] { "Seoul", "Mexico City" };
var tp = rf.GetTotalPopulation(names);
Assert.That(tp, Is.EqualTo(17500000 + 17400000));
}
public void SingletonTotalPopulationTest()
{
// Here we're testing on a 'live db'
// One of the consequences is that we need to look at the DB for the values we want to test
var rf = new SingletonRecordFinder();
// If somebody removes from the db one of the entries, the test will break
var names = new[] { "Seoul", "Mexico City", "Osaka" };
int tp = rf.GetTotalPopulation(names);
Assert.That(tp, Is.EqualTo(17500000 + 17400000 + 16425000));
// to be independent from a live db is very expensive
// what you want to do is to fake the object instead the real db
// In this particular scenario, to fake it isn't possible because RecordFinder is using a hardcoded reference
}
static void Main(string[] args)
{
var db = SingletonDatabase.Instance;
var db2 = SingletonDatabase.Instance;
Console.WriteLine(db.GetPopulation("Kitchener"));
Console.WriteLine($"db.Equals(db2): {db.Equals(db2)}");
Console.WriteLine($"SingletonDatabase.Count: {SingletonDatabase.Count}");
var rf = new SingletonRecordFinder();
Console.WriteLine($"Total population of Kitchener and Waterloo: {rf.GetTotalPopulation(new [] { "Kitchener", "Waterloo" })}");
var crf = new ConfigurableRecordFinder(new DummyDatabase());
Console.WriteLine($"Total population of Kitchener and Waterloo with ConfigurableRecordFinder and DummyDatabase injected: {crf.GetTotalPopulation(new[] { "Kitchener", "Waterloo" })}");
}
static void Main(string[] args)
{
Console.WriteLine("Singleton through dependency injection");
var collection = new ServiceCollection();
collection.AddSingleton <IDatabase, OrdinaryDatabse>();
var serviceProvider = collection.BuildServiceProvider();
var service = serviceProvider.GetService <IDatabase>();
var tokyoPop = service.GetPopulation("Tokyo");
Console.WriteLine($"Tokyo population is {tokyoPop}");
SingletonRecordFinder recordFinder = new SingletonRecordFinder();
var result = recordFinder.GetToalPopulation(new[] { "Tokyo", "New York" });
Console.WriteLine($"Total Population {result}");
var configurableRecordFinder = new ConfigurableRecordFinder(new DummyDatabase());
var total = configurableRecordFinder.GetToalPopulation(new[] { "New York", "Tokyo" });
Console.WriteLine(total);
Console.WriteLine("A variation of singleton, which is MonoState");
var ceo1 = new MonoState()
{
Name = "Payam",
Position = "CEO",
Age = 100
};
var ceo2 = new MonoState()
{
Name = "Jack",
Position = "Developer",
Age = 90
};
Console.WriteLine(ceo1);
Console.WriteLine(ceo2);
}
