public void ReadTest_Corrupt()
{
LsbStorageProvider provider = new LsbStorageProvider();
string filename = Path.Combine(TestContext.CurrentContext.TestDirectory, $"Resources{Path.DirectorySeparatorChar}TestImage2.png");
Assert.Throws <InvalidOperationException>(() => provider.Read(filename));
}
public void ConstructorTest()
{
INoiseProvider noiseProvider = new ConstantNoiseProvider();
LsbStorageProvider storageProvider = new LsbStorageProvider(noiseProvider);
Assert.AreEqual(noiseProvider, storageProvider.NoiseProvider);
}
public void GetStoragePotentialTest()
{
LsbStorageProvider provider = new LsbStorageProvider();
string filename = Path.Combine(TestContext.CurrentContext.TestDirectory, $"Resources{Path.DirectorySeparatorChar}TestImage0.png");
int expected = 9;
int actual = provider.GetStoragePotential(filename);
Assert.AreEqual(expected, actual);
}
public void ReadTest()
{
LsbStorageProvider provider = new LsbStorageProvider();
string filename = Path.Combine(TestContext.CurrentContext.TestDirectory, $"Resources{Path.DirectorySeparatorChar}TestImage1.png");
byte[] expected = { 66, 83, 94, 68, 89, 84 };
byte[] actual = provider.Read(filename);
CollectionAssert.AreEqual(expected, actual);
}
public void SaveTest()
{
LsbStorageProvider provider = new LsbStorageProvider(new ConstantNoiseProvider());
string inputFile = Path.Combine(TestContext.CurrentContext.TestDirectory, $"Resources{Path.DirectorySeparatorChar}TestImage0.png");
string outputFile = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.png");
string expectedFile = Path.Combine(TestContext.CurrentContext.TestDirectory, $"Resources{Path.DirectorySeparatorChar}TestImage1.png");
byte[] saveData = { 66, 83, 94, 68, 89, 84 };
provider.Save(inputFile, outputFile, saveData);
// Travis test:
Console.WriteLine(outputFile);
Console.WriteLine(System.Text.Encoding.UTF8.GetString(File.ReadAllBytes(outputFile)));
Console.WriteLine(System.Text.Encoding.UTF8.GetString(File.ReadAllBytes(expectedFile)));
// Load images
Bitmap expected = new Bitmap(expectedFile);
Bitmap actual = new Bitmap(outputFile);
try
{
bool fail = (expected.Width != actual.Width) || (expected.Height != actual.Height);
if (!fail)
{
// Compare pixel by pixel (due to encoding differences on Mono)
for (int i = 0; i < expected.Width; i++)
{
for (int j = 0; j < expected.Height; j++)
{
if (expected.GetPixel(i, j) != actual.GetPixel(i, j))
{
fail = true;
}
}
}
}
Assert.AreEqual(false, fail);
}
finally
{
expected.Dispose();
actual.Dispose();
File.Delete(outputFile);
}
}
public void SaveTest_DataTooLarge()
{
LsbStorageProvider provider = new LsbStorageProvider();
string inputFile = Path.Combine(TestContext.CurrentContext.TestDirectory, $"Resources{Path.DirectorySeparatorChar}TestImage0.png");
string outputFile = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.png");
byte[] saveData = { 66, 83, 94, 68, 89, 84, 66, 83, 94, 68, 89, 84 };
try
{
Assert.Throws <ArgumentException>(() => provider.Save(inputFile, outputFile, saveData));
}
finally
{
File.Delete(outputFile);
}
}
