public void Generate_By_Index_Returns_Sequence_Of_Values_Based_On_Index()
{
var sequence = XEnumerable.Generate(index => index * 2);
var expected = new[] { 0, 2, 4, 6, 8 };
var actual = sequence.Take(5);
actual.Should().Equal(expected);
}
public void Generate_By_Index_Throws_If_Generator_Is_Null()
{
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
// ReSharper disable once AssignNullToNotNullAttribute
var ex = Assert.Throws <ArgumentNullException>(() => XEnumerable.Generate <int>(null));
ex.ParamName.Should().Be("generator");
}
public void Generate_Returns_Sequence_Of_Values_Based_On_Previous_Value()
{
var sequence = XEnumerable.Generate(0, previous => previous + 2);
var expected = new[] { 0, 2, 4, 6, 8 };
var actual = sequence.Take(5);
actual.Should().Equal(expected);
}
public void Generate_Throws_If_Argument_Is_Null()
{
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
TestHelper.AssertThrowsWhenArgumentNull(() => XEnumerable.Generate(0, i => i));
}