public void MarkUnmodified()
        {
            AssemblyTracker tracker = new AssemblyTracker (new[] { _assemblyDefinition1 }, new TypeDefinitionCache ());
              tracker.MarkModified (_assemblyDefinition1);
              Assert.That (tracker.IsModified (_assemblyDefinition1), Is.True);

              tracker.MarkUnmodified (_assemblyDefinition1);

              Assert.That (tracker.IsModified (_assemblyDefinition1), Is.False);
        }
        public void IsModified_NotTracked()
        {
            AssemblyTracker tracker = new AssemblyTracker (new[] { _assemblyDefinition1 }, new TypeDefinitionCache ());

              Assert.Throws<ArgumentException> (() => tracker.IsModified (_assemblyDefinition2));
        }