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GeezerVison is showing github.com — pythonnet/src/embed_tests/TestPythonException.cs at master · pythonnet/pythonnet

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using System;
using NUnit.Framework;
using Python.Runtime;
namespace Python.EmbeddingTest
{
public class TestPythonException
{
[Test]
public void TestMessage()
{
var list = new PyList();
PyObject foo = null;
var ex = Assert.Throws<PythonException>(() => foo = list[0]);
Assert.That(ex.Message, Is.EqualTo("list index out of range"));
Assert.IsNull(foo);
}
[Test]
public void TestType()
{
var list = new PyList();
PyObject foo = null;
var ex = Assert.Throws<PythonException>(() => foo = list[0]);
Assert.That(ex.Type.Name, Is.EqualTo("IndexError"));
Assert.IsNull(foo);
}
[Test]
public void TestNoError()
{
// There is no PyErr to fetch
Assert.Throws<InvalidOperationException>(() => PythonException.FetchCurrentRaw());
var currentError = PythonException.FetchCurrentOrNullRaw();
Assert.IsNull(currentError);
}
[Test]
public void TestNestedExceptions()
{
try
{
PythonEngine.Exec(@"
try:
raise Exception('inner')
except Exception as ex:
raise Exception('outer') from ex
");
}
catch (PythonException ex)
{
Assert.That(ex.InnerException, Is.InstanceOf<PythonException>());
Assert.That(ex.InnerException.Message, Is.EqualTo("inner"));
}
}
[Test]
public void InnerIsEmptyWithNoCause()
{
var list = new PyList();
PyObject foo = null;
var ex = Assert.Throws<PythonException>(() => foo = list[0]);
Assert.IsNull(ex.InnerException);
}
[Test]
public void TestPythonExceptionFormat()
{
try
{
PythonEngine.Exec("raise ValueError('Error!')");
Assert.Fail("Exception should have been raised");
}
catch (PythonException ex)
{
// Console.WriteLine($"Format: {ex.Format()}");
// Console.WriteLine($"Stacktrace: {ex.StackTrace}");
Assert.That(
ex.Format(),
Does.Contain("Traceback")
.And.Contains("(most recent call last):")
.And.Contains("ValueError: Error!")
);
// Check that the stacktrace is properly formatted
Assert.That(
ex.StackTrace,
Does.Not.StartWith("[")
.And.Not.Contain("\\n")
);
}
}
[Test]
public void TestPythonExceptionFormatNoTraceback()
{
try
{
var module = PyModule.Import("really____unknown___module");
Assert.Fail("Unknown module should not be loaded");
}
catch (PythonException ex)
{
// ImportError/ModuleNotFoundError do not have a traceback when not running in a script
Assert.That(ex.Format(), Is.EqualTo(ex.StackTrace));
}
}
[Test]
public void TestPythonExceptionFormatNormalized()
{
try
{
PythonEngine.Exec("a=b\n");
Assert.Fail("Exception should have been raised");
}
catch (PythonException ex)
{
Assert.AreEqual("Traceback (most recent call last):\n File \"<string>\", line 1, in <module>\nNameError: name 'b' is not defined\n", ex.Format());
}
}
[Test]
public void TestPythonException_PyErr_NormalizeException()
{
using (var scope = Py.CreateScope())
{
scope.Exec(@"
class TestException(NameError):
def __init__(self, val):
super().__init__(val)
x = int(val)");
Assert.IsTrue(scope.TryGet("TestException", out PyObject type));
PyObject str = "dummy string".ToPython();
var typePtr = new NewReference(type.Reference);
var strPtr = new NewReference(str.Reference);
var tbPtr = new NewReference(Runtime.Runtime.None.Reference);
Runtime.Runtime.PyErr_NormalizeException(ref typePtr, ref strPtr, ref tbPtr);
using var typeObj = typePtr.MoveToPyObject();
using var strObj = strPtr.MoveToPyObject();
using var tbObj = tbPtr.MoveToPyObject();
// the type returned from PyErr_NormalizeException should not be the same type since a new
// exception was raised by initializing the exception
Assert.IsFalse(PythonReferenceComparer.Instance.Equals(type, typeObj));
// the message should now be the string from the throw exception during normalization
Assert.That(strObj.ToString(), Is.EqualTo("invalid literal for int() with base 10: 'dummy string'"));
}
}
[Test]
public void TestPythonException_Normalize_ThrowsWhenErrorSet()
{
Exceptions.SetError(Exceptions.TypeError, "Error!");
var pythonException = PythonException.FetchCurrentRaw();
Exceptions.SetError(Exceptions.TypeError, "Another error");
Assert.Throws<InvalidOperationException>(() => pythonException.Normalize());
Exceptions.Clear();
}
}
}
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