Can XUnit interfere with the code? - xunit

Question

I recently have a very weird behaviour, so weird I'm starting to wonder if the culprit could be the unit framework I'm using (XUnit). I asked a question about it there: Can Expressmapper copy to destination? but this one is no longer about Expressmapper but about XUnit.
Do you know if in some way XUnit can intefere with the code?
Here's a the reason I'm asking:
I can run those 'together or separatly) in any order and I always get this crazy behaviour:
First test fails (Test_xxx)
Second test pass (Test_Map)
Both tests contain the very same code!!
[Fact]
[Trait("Test kind", "Integration")]
public void Test_xxx()
{
// Arrange
var mapper = new MappingServiceProvider();
mapper.Register<MapSource, MapDestination>();
var src = new MapSource
{
Id = Guid.NewGuid().GetHashCode(),
Guid = Guid.NewGuid(),
Parent = new MapSource
{
Id = Guid.NewGuid().GetHashCode(),
Guid = Guid.NewGuid()
}
};
src.Children = Enumerable.Range(0, 3).Select(i => new MapSource
{
Id = Guid.NewGuid().GetHashCode(),
Guid = Guid.NewGuid()
}).ToList();
var dst = new MapDestination();
// Act
mapper.Map(src, dst);
// Assert
var compare = new CompareLogic(new ComparisonConfig
{
IgnoreObjectTypes = true
});
var comparison = compare.Compare(src, dst);
Assert.Equal(new List<Difference>(), comparison.Differences);
}
[Fact]
[Trait("Test kind", "Integration")]
public void Test_Map()
{
// Arrange
var mapper = new MappingServiceProvider();
mapper.Register<MapSource, MapDestination>();
var src = new MapSource
{
Id = Guid.NewGuid().GetHashCode(),
Guid = Guid.NewGuid(),
Parent = new MapSource
{
Id = Guid.NewGuid().GetHashCode(),
Guid = Guid.NewGuid()
}
};
src.Children = Enumerable.Range(0, 3).Select(i => new MapSource
{
Id = Guid.NewGuid().GetHashCode(),
Guid = Guid.NewGuid()
}).ToList();
var dst = new MapDestination();
// Act
mapper.Map(src, dst);
// Assert
var compare = new CompareLogic(new ComparisonConfig
{
IgnoreObjectTypes = true
});
var comparison = compare.Compare(src, dst);
Assert.Equal(new List<Difference>(), comparison.Differences);
}

Answer 1

I had another method called Test_Map (with a different signature; aka overload).
I guess XUnit requires method name to be unique (something I intended to do).