public void FileSystem_NonexistingFileIsRead_ExceptionIsThrown()
{
var fileSystem = Substitute.For <IFileSystem>();
fileSystem.File.ReadAllBytes(Arg.Any <string>()).Returns(x => throw new FileNotFoundException());
IDataReader reader = new FileSystemDataReader(fileSystem);
Action act = () => reader.ReadAllBytes(@"C:\test.txt");
act.Should().Throw <FileNotFoundException>();
}
public void FileSystem_ExistingFileIsRead_FileContentIsReturned()
{
var fileSystem = Substitute.For <IFileSystem>();
fileSystem.File.ReadAllBytes(@"C:\test.txt").Returns(new byte[] { 1, 2, 3 });
IDataReader reader = new FileSystemDataReader(fileSystem);
byte[] actual = reader.ReadAllBytes(@"C:\test.txt");
actual.Should().BeEquivalentTo(new byte[] { 1, 2, 3 });
}