public void GetMovieRecommendationsTest()
{
var a = new Movie(1, 1.2f);
var b = new Movie(2, 2.4f);
var c = new Movie(3, 3.6f);
var d = new Movie(4, 4.8f);
// A
a.AddSimilarMovie(b);
a.AddSimilarMovie(c);
// B
b.AddSimilarMovie(d);
// C
c.AddSimilarMovie(d);
a.GetMovieRecommendations(2).Should().BeEquivalentTo(new[] { c, d });
a.GetMovieRecommendations(4).Should().BeEquivalentTo(new[] { a, b, c, d });
a.GetMovieRecommendations(1).Should().BeEquivalentTo(new[] { d });
}