public void CanReadWriteNull()
{
var sut = _fixture.Create <DbaseNullableSingle>();
sut.Value = null;
using (var stream = new MemoryStream())
{
using (var writer = new BinaryWriter(stream, Encoding.ASCII, true))
{
sut.Write(writer);
writer.Flush();
}
stream.Position = 0;
using (var reader = new BinaryReader(stream, Encoding.ASCII, true))
{
var result = new DbaseNullableSingle(sut.Field);
result.Read(reader);
Assert.Equal(sut.Field, result.Field);
Assert.Equal(sut.Value, result.Value);
}
}
}
public void LengthOfNegativeValueBeingSetCanNotExceedFieldLength()
{
var length = DbaseNullableSingle.MaximumLength;
var decimalCount = _fixture.GenerateDbaseSingleDecimalCount(length);
var sut =
new DbaseNullableSingle(
new DbaseField(
_fixture.Create <DbaseFieldName>(),
DbaseFieldType.Float,
_fixture.Create <ByteOffset>(),
length,
decimalCount
)
);
Assert.Throws <ArgumentException>(() => sut.Value = float.MinValue);
}
public void CanReadWriteWithMaxDecimalCount()
{
var length = DbaseNullableSingle.MaximumLength;
var decimalCount = DbaseDecimalCount.Min(DbaseNullableSingle.MaximumDecimalCount,
new DbaseDecimalCount(length.ToInt32() - 2));
var sut =
new DbaseNullableSingle(
new DbaseField(
_fixture.Create <DbaseFieldName>(),
DbaseFieldType.Float,
_fixture.Create <ByteOffset>(),
length,
decimalCount
)
);
using (var random = new PooledRandom())
{
sut.Value =
new DbaseFieldNumberGenerator(random)
.GenerateAcceptableValue(sut);
using (var stream = new MemoryStream())
{
using (var writer = new BinaryWriter(stream, Encoding.ASCII, true))
{
sut.Write(writer);
writer.Flush();
}
stream.Position = 0;
using (var reader = new BinaryReader(stream, Encoding.ASCII, true))
{
var result = new DbaseNullableSingle(sut.Field);
result.Read(reader);
Assert.Equal(sut, result, new DbaseFieldValueEqualityComparer());
}
}
}
}
public void CanNotReadPastEndOfStream()
{
var sut = _fixture.Create <DbaseNullableSingle>();
using (var stream = new MemoryStream())
{
using (var writer = new BinaryWriter(stream, Encoding.ASCII, true))
{
writer.Write(_fixture.CreateMany <byte>(new Random().Next(0, sut.Field.Length.ToInt32())).ToArray());
writer.Flush();
}
stream.Position = 0;
using (var reader = new BinaryReader(stream, Encoding.ASCII, true))
{
var result = new DbaseNullableSingle(sut.Field);
Assert.Throws <EndOfStreamException>(() => result.Read(reader));
}
}
}
public void WritesExcessDecimalsAsZero()
{
var length = _fixture.GenerateDbaseSingleLength();
var decimalCount = _fixture.GenerateDbaseSingleDecimalCount(length);
var sut = new DbaseNullableSingle(
new DbaseField(
_fixture.Create <DbaseFieldName>(),
DbaseFieldType.Float,
_fixture.Create <ByteOffset>(),
length,
decimalCount
), 0.0f);
using (var stream = new MemoryStream())
{
using (var writer = new BinaryWriter(stream, Encoding.ASCII, true))
{
sut.Write(writer);
writer.Flush();
}
stream.Position = 0;
if (decimalCount.ToInt32() == 0)
{
Assert.Equal(
"0".PadLeft(length.ToInt32()),
Encoding.ASCII.GetString(stream.ToArray()));
}
else
{
Assert.Equal(
new string(' ', length.ToInt32() - decimalCount.ToInt32() - 2)
+ "0."
+ new string('0', decimalCount.ToInt32()),
Encoding.ASCII.GetString(stream.ToArray())
);
}
}
}
public float?GenerateAcceptableValue(DbaseNullableSingle value)
{
float?result = default;
// null only
if (value.Field.Length < DbaseNullableSingle.MinimumLength)
{
return(result);
}
// null or positive only
if (value.Field.Length < DbaseNullableSingle.NegativeValueMinimumLength)
{
switch (_random.Next() % 2)
{
//case 0: null
case 1:
result = GeneratePositiveNullableSingleValue(value.Field);
break;
}
return(result);
}
// null or positive or negative
switch (_random.Next() % 3)
{
//case 0: null
case 1:
result = GeneratePositiveNullableSingleValue(value.Field);
break;
case 2:
result = GenerateNegativeNullableSingleValue(value.Field);
break;
}
return(result);
}
public void Visit(DbaseNullableSingle value)
{
value.Value = _generator.GenerateAcceptableValue(value);
}
public void Visit(DbaseNullableSingle value)
{
HashCode = value.Value?.GetHashCode() ?? 0;
}
public void Visit(DbaseNullableSingle value)
{
Comparer = new DelegatingDbaseFieldValueEqualityComparer <DbaseNullableSingle>(
new DbaseNullableSingleEqualityComparer(_precision));
}
