public void CanReadWriteNull()
{
var sut = _fixture.Create <DbaseSingle>();
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 DbaseSingle(sut.Field);
result.Read(reader);
Assert.Equal(sut.Field, result.Field);
Assert.Equal(sut.Value, result.Value);
}
}
}
public float GenerateAcceptableValue(DbaseSingle value)
{
float result = default;
// null only
if (value.Field.Length < DbaseSingle.MinimumLength)
{
return(result);
}
// positive only
if (value.Field.Length < DbaseSingle.NegativeValueMinimumLength)
{
result = GeneratePositiveSingleValue(value.Field);
return(result);
}
// positive or negative
switch (_random.Next() % 2)
{
case 0:
result = GeneratePositiveSingleValue(value.Field);
break;
case 1:
result = GenerateNegativeSingleValue(value.Field);
break;
}
return(result);
}
public void CanReadWriteNull()
{
_fixture.CustomizeDbaseSingleWithoutValue();
var sut = _fixture.Create <DbaseSingle>();
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 DbaseSingle(sut.Field);
result.Read(reader);
Assert.Equal(sut.Field, result.Field);
Assert.Throws <FormatException>(() => sut.Value);
}
}
}
public void LengthOfNegativeValueBeingSetCanNotExceedFieldLength()
{
var length = DbaseSingle.MaximumLength;
var decimalCount = _fixture.GenerateDbaseSingleDecimalCount(length);
var sut =
new DbaseSingle(
new DbaseField(
_fixture.Create <DbaseFieldName>(),
DbaseFieldType.Float,
_fixture.Create <ByteOffset>(),
length,
decimalCount
)
);
Assert.Throws <ArgumentException>(() => sut.Value = float.MinValue);
}
public void CanReadWriteWithMaxDecimalCount()
{
var length = DbaseSingle.MaximumLength;
var decimalCount = DbaseDecimalCount.Min(DbaseSingle.MaximumDecimalCount,
new DbaseDecimalCount(length.ToInt32() - 2));
var sut =
new DbaseSingle(
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 DbaseSingle(sut.Field);
result.Read(reader);
Assert.Equal(sut, result, new DbaseFieldValueEqualityComparer());
}
}
}
}
public void CanNotReadPastEndOfStream()
{
var sut = _fixture.Create <DbaseSingle>();
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 DbaseSingle(sut.Field);
Assert.Throws <EndOfStreamException>(() => result.Read(reader));
}
}
}
public void WritesExcessDecimalsAsZero()
{
var length = _fixture.GenerateDbaseSingleLength();
var decimalCount = _fixture.GenerateDbaseSingleDecimalCount(length);
var sut = new DbaseSingle(
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(DbaseSingle value)
{
var result = default(float?);
// null only
if (value.Field.Length < DbaseSingle.MinimumLength)
{
return(result);
}
// null or positive only
if (value.Field.Length < DbaseSingle.NegativeValueMinimumLength)
{
switch (_random.Next() % 2)
{
//case 0: null
case 1:
result = GeneratePositiveSingleValue(value.Field);
break;
}
return(result);
}
// null or positive or negative
switch (_random.Next() % 3)
{
//case 0: null
case 1:
result = GeneratePositiveSingleValue(value.Field);
break;
case 2:
result = GenerateNegativeSingleValue(value.Field);
break;
}
return(result);
}
public static void CustomizeDbaseSingle(this IFixture fixture)
{
fixture.Customize <DbaseSingle>(
customization =>
customization
.FromNumberGenerator(
generator =>
{
var length = fixture.GenerateDbaseSingleLength();
var decimalCount = fixture.GenerateDbaseSingleDecimalCount(length);
var field = new DbaseField(
fixture.Create <DbaseFieldName>(),
DbaseFieldType.Float,
fixture.Create <ByteOffset>(),
length,
decimalCount
);
var value = new DbaseSingle(field);
value.Value = generator.GenerateAcceptableValue(value);
return(value);
}
)
.OmitAutoProperties());
}
public void Visit(DbaseSingle value)
{
value.Value = _generator.GenerateAcceptableValue(value);
}
public void Inspect(DbaseSingle value)
{
HashCode = value.Value.HasValue
? value.Value.Value.GetHashCode()
: 0;
}
public void Inspect(DbaseSingle value)
{
Value = value.Value;
}
public void Inspect(DbaseSingle value)
{
Comparer = new DelegatingDbaseFieldValueEqualityComparer <DbaseSingle>(
new DbaseSingleEqualityComparer(_precision));
}
public void Visit(DbaseSingle value)
{
HashCode = value.Value.GetHashCode();
}