public void Be_Creatable()
{
var sut = new ProvideFileSuggestions();
sut.Should().NotBeNull();
sut.Should().BeAssignableTo <IProvideSuggestions>();
}
public void Return_Empty_If_Not_Exists()
{
const string dataConnection = "file://cities.txt";
var mock = Substitute.For <IFileSystem>();
mock.ReadAllLines("cities.txt").Returns(Enumerable.Empty <string>());
mock.FileExists("cities.txt").Returns(false);
var prefix = "thomas";
var expected = new string[] { };
var sut = new ProvideFileSuggestions(mock);
var actual = sut.For(prefix, dataConnection);
actual.Should().BeEquivalentTo(expected);
}
public void Return_Empty_On_Empty_Prefix()
{
const string dataConnection = "file://cities.txt";
var mock = Substitute.For <IFileSystem>();
mock.ReadAllLines("cities.txt").Returns("Bonn|Cologne|Bern|Berlin".Split('|'));
mock.FileExists("cities.txt").Returns(true);
var prefix = "";
var expected = new string[] { };
var sut = new ProvideFileSuggestions(mock);
var actual = sut.For(prefix, dataConnection);
actual.Should().BeEquivalentTo(expected);
}
public void Return_Prefixes_Twice_Uses_Caching()
{
const string dataConnection = "file://cities.txt";
const string prefix = "Be";
var expected = new[] { "Bern", "Berlin" };
var mock = Substitute.For <IFileSystem>();
mock.ReadAllLines("cities.txt").Returns("Bonn|Cologne|Bern|Berlin".Split('|'));
mock.FileExists("cities.txt").Returns(true);
var sut = new ProvideFileSuggestions(mock);
var temp = sut.For(prefix, dataConnection).ToArray();
var actual = sut.For(prefix, dataConnection).ToArray();
actual.Should().BeEquivalentTo(expected);
actual.Should().BeEquivalentTo(temp, "the results should be equal if you all it twice");
mock.Received(1).ReadAllLines("cities.txt");
mock.Received(1).FileExists("cities.txt");
}