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TestPythonException.cs
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345 lines (300 loc) · 11.5 KB
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using System;
using System.IO;
using System.Linq;
using NUnit.Framework;
using Python.Runtime;
namespace Python.EmbeddingTest
{
public class TestPythonException
{
[OneTimeSetUp]
public void SetUp()
{
PythonEngine.Initialize();
// Add scripts folder to path in order to be able to import the test modules
string testPath = Path.Combine(TestContext.CurrentContext.TestDirectory, "fixtures");
TestContext.Out.WriteLine(testPath);
using var str = Runtime.Runtime.PyString_FromString(testPath);
Assert.IsFalse(str.IsNull());
BorrowedReference path = Runtime.Runtime.PySys_GetObject("path");
Assert.IsFalse(path.IsNull);
Runtime.Runtime.PyList_Append(path, str.Borrow());
}
[OneTimeTearDown]
public void Dispose()
{
PythonEngine.Shutdown();
}
[Test]
public void TestMessage()
{
var list = new PyList();
PyObject foo = null;
var ex = Assert.Throws<PythonException>(() => foo = list[0]);
Assert.AreEqual("list index out of range", ex.Message);
Assert.IsNull(foo);
}
[Test]
public void TestType()
{
var list = new PyList();
PyObject foo = null;
var ex = Assert.Throws<PythonException>(() => foo = list[0]);
Assert.AreEqual("IndexError", ex.Type.Name);
Assert.IsNull(foo);
}
[Test]
public void TestMessageComplete()
{
using (Py.GIL())
{
try
{
// importing a module with syntax error 'x = 01' will throw
PyModule.FromString(Guid.NewGuid().ToString(), "x = 01");
}
catch (PythonException exception)
{
Assert.True(exception.Message.Contains("x = 01"));
return;
}
Assert.Fail("No Exception was thrown!");
}
}
[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.AreEqual(ex.StackTrace, ex.Format());
}
}
[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.AreNotEqual(type.Handle, typeObj.Handle);
// the message should now be the string from the throw exception during normalization
Assert.AreEqual("invalid literal for int() with base 10: 'dummy string'", strObj.ToString());
}
}
[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();
}
[Test]
public void TestGetsPythonCodeInfoInStackTrace()
{
using (Py.GIL())
{
dynamic testClassModule = PyModule.FromString("TestGetsPythonCodeInfoInStackTrace_Module", @"
from clr import AddReference
AddReference(""Python.EmbeddingTest"")
from Python.EmbeddingTest import *
class TestPythonClass(TestPythonException.TestClass):
def CallThrow(self):
super().ThrowException()
");
try
{
var instance = testClassModule.TestPythonClass();
dynamic module = Py.Import("PyImportTest.SampleScript");
module.invokeMethod(instance, "CallThrow");
}
catch (ClrBubbledException ex)
{
Assert.AreEqual("Test Exception Message", ex.InnerException.Message);
var pythonTracebackLines = ex.PythonTraceback.TrimEnd('\n').Split('\n').Select(x => x.Trim()).ToList();
Assert.AreEqual(5, pythonTracebackLines.Count);
Assert.AreEqual("File \"none\", line 9, in CallThrow", pythonTracebackLines[0]);
Assert.IsTrue(new[]
{
"File ",
"fixtures\\PyImportTest\\SampleScript.py",
"line 5",
"in invokeMethodImpl"
}.All(x => pythonTracebackLines[1].Contains(x)));
Assert.AreEqual("getattr(instance, method_name)()", pythonTracebackLines[2]);
Assert.IsTrue(new[]
{
"File ",
"fixtures\\PyImportTest\\SampleScript.py",
"line 2",
"in invokeMethod"
}.All(x => pythonTracebackLines[3].Contains(x)));
Assert.AreEqual("invokeMethodImpl(instance, method_name)", pythonTracebackLines[4]);
}
catch (Exception ex)
{
Assert.Fail($"Unexpected exception: {ex}");
}
}
}
[Test]
public void TestGetsPythonCodeInfoInStackTraceForNestedInterop()
{
using (Py.GIL())
{
dynamic testClassModule = PyModule.FromString("TestGetsPythonCodeInfoInStackTraceForNestedInterop_Module", @"
from clr import AddReference
AddReference(""Python.EmbeddingTest"")
AddReference(""System"")
from Python.EmbeddingTest import *
from System import Action
class TestPythonClass(TestPythonException.TestClass):
def CallThrow(self):
super().ThrowExceptionNested()
def GetThrowAction():
return Action(CallThrow)
def CallThrow():
TestPythonClass().CallThrow()
");
try
{
var action = testClassModule.GetThrowAction();
action();
}
catch (ClrBubbledException ex)
{
Assert.AreEqual("Test Exception Message", ex.InnerException.Message);
var pythonTracebackLines = ex.PythonTraceback.TrimEnd('\n').Split('\n').Select(x => x.Trim()).ToList();
Assert.AreEqual(4, pythonTracebackLines.Count);
Assert.IsTrue(new[]
{
"File ",
"fixtures\\PyImportTest\\SampleScript.py",
"line 5",
"in invokeMethodImpl"
}.All(x => pythonTracebackLines[0].Contains(x)));
Assert.AreEqual("getattr(instance, method_name)()", pythonTracebackLines[1]);
Assert.IsTrue(new[]
{
"File ",
"fixtures\\PyImportTest\\SampleScript.py",
"line 2",
"in invokeMethod"
}.All(x => pythonTracebackLines[2].Contains(x)));
Assert.AreEqual("invokeMethodImpl(instance, method_name)", pythonTracebackLines[3]);
}
catch (Exception ex)
{
Assert.Fail($"Unexpected exception: {ex}");
}
}
}
public class TestClass
{
public void ThrowException()
{
throw new ArgumentException("Test Exception Message");
}
public void ThrowExceptionNested()
{
using var _ = Py.GIL();
dynamic module = Py.Import("PyImportTest.SampleScript");
module.invokeMethod(this, "ThrowException");
}
}
}
}
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