pythonnet/src/embed_tests/TestConverter.cs at master · pythonnet/pythonnet · GitHub

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Numerics;

using NUnit.Framework;

using Python.Runtime;

using PyRuntime = Python.Runtime.Runtime;

namespace Python.EmbeddingTest

{

public class TestConverter

{

static readonly Type[] _numTypes = new Type[]

{

typeof(short),

typeof(ushort),

typeof(int),

typeof(uint),

typeof(long),

typeof(ulong)

};

[Test]

public void TestConvertSingleToManaged(

[Values(float.PositiveInfinity, float.NegativeInfinity, float.MinValue, float.MaxValue, float.NaN,

float.Epsilon)] float testValue)

{

var pyFloat = new PyFloat(testValue);

object convertedValue;

var converted = Converter.ToManaged(pyFloat, typeof(float), out convertedValue, false);

Assert.That(converted, Is.True);

Assert.That(((float)convertedValue).Equals(testValue), Is.True);

}

[Test]

public void TestConvertDoubleToManaged(

[Values(double.PositiveInfinity, double.NegativeInfinity, double.MinValue, double.MaxValue, double.NaN,

double.Epsilon)] double testValue)

{

var pyFloat = new PyFloat(testValue);

object convertedValue;

var converted = Converter.ToManaged(pyFloat, typeof(double), out convertedValue, false);

Assert.That(converted, Is.True);

Assert.That(((double)convertedValue).Equals(testValue), Is.True);

}

[Test]

public void CovertTypeError()

{

Type[] floatTypes = new Type[]

{

typeof(float),

typeof(double)

};

using (var s = new PyString("abc"))

{

foreach (var type in _numTypes.Union(floatTypes))

{

object value;

try

{

bool res = Converter.ToManaged(s, type, out value, true);

Assert.That(res, Is.False);

var bo = Exceptions.ExceptionMatches(Exceptions.TypeError);

Assert.That(Exceptions.ExceptionMatches(Exceptions.TypeError)

|| Exceptions.ExceptionMatches(Exceptions.ValueError), Is.True);

}

finally

{

Exceptions.Clear();

}

[Test]

public void ConvertOverflow()

{

using (var num = new PyInt(ulong.MaxValue))

{

using var largeNum = PyRuntime.PyNumber_Add(num, num);

try

{

object value;

foreach (var type in _numTypes)

{

bool res = Converter.ToManaged(largeNum.BorrowOrThrow(), type, out value, true);

Assert.That(res, Is.False);

Assert.That(Exceptions.ExceptionMatches(Exceptions.OverflowError), Is.True);

Exceptions.Clear();

}

finally

{

Exceptions.Clear();

}

[Test]

public void NoImplicitConversionToBool()

{

var pyObj = new PyList(items: new[] { 1.ToPython(), 2.ToPython() }).ToPython();

Assert.Throws<InvalidCastException>(() => pyObj.As<bool>());

}

[Test]

public void ToNullable()

{

const int Const = 42;

var i = new PyInt(Const);

var ni = i.As<int?>();

Assert.That(ni, Is.EqualTo(Const));

}

[Test]

public void BigIntExplicit()

{

BigInteger val = 42;

var i = new PyInt(val);

var ni = i.As<BigInteger>();

Assert.That(ni, Is.EqualTo(val));

var nullable = i.As<BigInteger?>();

Assert.That(nullable, Is.EqualTo(val));

}

[Test]

public void PyIntImplicit()

{

var i = new PyInt(1);

var ni = (PyObject)i.As<object>();

Assert.That(PythonReferenceComparer.Instance.Equals(i, ni), Is.True);

}

[Test]

public void ToPyList()

{

var list = new PyList();

list.Append("hello".ToPython());

list.Append("world".ToPython());

var back = list.ToPython().As<PyList>();

Assert.That(back.Length(), Is.EqualTo(list.Length()));

}

[Test]

public void RawListProxy()

{

var list = new List<string> {"hello", "world"};

var listProxy = PyObject.FromManagedObject(list);

var clrObject = (CLRObject)ManagedType.GetManagedObject(listProxy);

Assert.That(clrObject.inst, Is.SameAs(list));

}

[Test]

public void RawPyObjectProxy()

{

var pyObject = "hello world!".ToPython();

var pyObjectProxy = PyObject.FromManagedObject(pyObject);

var clrObject = (CLRObject)ManagedType.GetManagedObject(pyObjectProxy);

Assert.That(clrObject.inst, Is.SameAs(pyObject));

#pragma warning disable CS0612 // Type or member is obsolete

const string handlePropertyName = nameof(PyObject.Handle);

#pragma warning restore CS0612 // Type or member is obsolete

var proxiedHandle = pyObjectProxy.GetAttr(handlePropertyName).As<IntPtr>();

Assert.That(proxiedHandle, Is.EqualTo(pyObject.DangerousGetAddressOrNull()));

}

[Test]

public void GenericToPython()

{

int i = 42;

var pyObject = i.ToPythonAs<IConvertible>();

var type = pyObject.GetPythonType();

Assert.That(type.Name, Is.EqualTo(nameof(IConvertible)));

}

// regression for https://github.com/pythonnet/pythonnet/issues/451

[Test]

public void CanGetListFromDerivedClass()

{

using var scope = Py.CreateScope();

scope.Import(typeof(GetListImpl).Namespace, asname: "test");

scope.Exec(@"

class PyGetListImpl(test.GetListImpl):

pass

");

var pyImpl = scope.Get("PyGetListImpl");

dynamic inst = pyImpl.Invoke();

List<string> result = inst.GetList();

Assert.That(result, Is.EqualTo(new[] { "testing" }).AsCollection);

}

public interface IGetList

{

List<string> GetList();

}

public class GetListImpl : IGetList

{

public List<string> GetList() => new() { "testing" };

}

pythonnet/src/embed_tests/TestConverter.cs at master · pythonnet/pythonnet · GitHub

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