public void ToStringTest(string source, int startIndex, int count, string expected)
{
using (var buffer = new StringBuffer(source))
{
buffer.SubString(startIndex: (ulong)startIndex, count: count).Should().Be(expected);
}
}
public void ToStringCountOverLengthThrows()
{
using (var buffer = new StringBuffer())
{
Action action = () => buffer.SubString(startIndex: 0, count: 1);
action.ShouldThrow<ArgumentOutOfRangeException>();
}
}
public void SubStringIndexPlusCountCombinedOutOfRangeThrows()
{
using (var buffer = new StringBuffer("a"))
{
Action action = () => buffer.SubString(startIndex: 1, count: 1);
action.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("startIndex");
buffer.Append("b");
action.ShouldNotThrow<ArgumentOutOfRangeException>();
action = () => buffer.SubString(startIndex: 1, count: 2);
action.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("count");
}
}
public void SubStringImplicitCountOverMaxStringThrows()
{
using (var buffer = new StringBuffer())
{
var length = buffer.GetType().GetField("_length", BindingFlags.NonPublic | BindingFlags.Instance);
length.SetValue(buffer, (uint)int.MaxValue + 1);
Action action = () => buffer.SubString(startIndex: 0, count: -1);
action.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("count");
}
}
public void SubStringNegativeCountThrows()
{
using (var buffer = new StringBuffer())
{
Action action = () => buffer.SubString(startIndex: 0, count: -2);
action.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("count");
}
}
public void SubStringIndexOverLengthThrows()
{
using (var buffer = new StringBuffer())
{
Action action = () => buffer.SubString(startIndex: 1);
action.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("startIndex");
buffer.Append("a");
action.ShouldThrow<ArgumentOutOfRangeException>().And.ParamName.Should().Be("startIndex");
buffer.Append("b");
action.ShouldNotThrow();
}
}
