Using a unit test I need to bypass this code and reach return IsFile;
line.
The variable client
is my own wrapper around SSH.Net SftpClient which I can mock. The enum SftpCheckPathExistence
is my own custom enum.
code
SftpFileAttributes attrs = client.GetAttributes(fileName);
if (attrs.IsDirectory)
{
return SftpCheckPathExistence.IsDirectory;
}
return SftpCheckPathExistence.IsFile;
unit test
clientMock.Setup(f => f.GetAttributes(It.IsAny<string>())).Returns(???);
The problem is I cannot mock the return of GetAttributes(filename)
which is the class SftpFileAttributes
.
1. Write no clientMock.Setup
SftpFileAttributes attrs = client.GetAttributes(fileName); // attrs is null
if (attrs.IsDirectory) // errors because its null
2. First try – return instantiated class
var sftpFileAttributes = new SftpFileAttributes(); // Class has no public constructor, this errors.
sftpFileAttributes.IsDirectory = false; // Property has private setter, this errors.
clientMock.Setup(f => f.GetAttributes(It.IsAny<string>())).Returns(sftpFileAttributes);
3. Second try – mock SftpFileAttributes
var sftpFileAttributesMock = new Mock<SftpFileAttributes>();
sftpFileAttributesMock.SetupGet(f => f.IsDirectory).Returns(false);
// This errors because Moq creates a derived class as a mock and IsDirectory is not marked virtual to be overriden.
clientMock.Setup(f => f.GetAttributes(It.IsAny<string>())).Returns(sftpFileAttributes.Object);
Error:
System.NotSupportedException
HResult=0x80131515
Message=Unsupported expression: f => f.IsDirectory
Non-overridable members (here: SftpFileAttributes.get_IsDirectory) may not be used in setup / verification expressions.
Source=Moq
StackTrace:
at Moq.Guard.IsOverridable(MethodInfo method, Expression expression)