public async Task Read_NegativeAbsoluteOffset_InvalidOperationExceptionThrown()
{
var fs = new MockFileSystem();
fs.AddFile("test.dat", new MockFileData(new byte[] { 0x1, 0x2, 0x3, 0x4, 0x5 }));
// -4 + 0 == negative absolute offset
var data = new TestDataType(-4);
await Assert.ThrowsAsync <InvalidOperationException>(async() =>
{
using (var file = fs.File.OpenRead("test.dat"))
{
await data.ReadAsync(file, 0, new NefsProgress());
}
});
}
public async Task Read_PastEndOfFile_InvalidOperationExceptionThrown()
{
var fs = new MockFileSystem();
fs.AddFile("test.dat", new MockFileData(new byte[] { 0x1, 0x2, 0x3, 0x4, 0x5 }));
// 0 + 10 == past end of file
var data = new TestDataType(0);
await Assert.ThrowsAsync <InvalidOperationException>(async() =>
{
using (var file = fs.File.OpenRead("test.dat"))
{
await data.ReadAsync(file, 10, new NefsProgress());
}
});
}
public async Task Read_PositiveDataOffset_ReadSuccess()
{
var fs = new MockFileSystem();
fs.AddFile("test.dat", new MockFileData(new byte[] { 0x1, 0x2, 0x3, 0x4, 0x5 }));
// 1 + 0 == positive absolute offset
var data = new TestDataType(1);
using (var file = fs.File.OpenRead("test.dat"))
{
await data.ReadAsync(file, 0, new NefsProgress());
}
var expected = new byte[] { 0x2, 0x3, 0x4, 0x5 };
Assert.Equal(expected, data.GetBytes());
}
public async Task Read_NullStream_ArgumentNullExceptionThrown()
{
var data = new TestDataType(0);
await Assert.ThrowsAsync <ArgumentNullException>(async() => await data.ReadAsync(null, 0, new NefsProgress()));
}