public void Test_Comparison_Fails_For_Different_Files()
{
// This test just checks the file size comparer, not the matching algorithm
var mockIo = Substitute.For <IIO>();
var comparer = new FileSizeComparer();
comparer.Init(mockIo);
var fileA = "a.file";
var fileB = "different.foo";
Assert.That(comparer.WantsToHandle(fileA), Is.True);
Assert.That(comparer.WantsToHandle(fileB), Is.True);
// Setup the io to return different sizes
mockIo.ReadFile(fileA).Returns(MakeStreamFromString("a"));
mockIo.ReadFile(fileB).Returns(MakeStreamFromString("different"));
Assert.That(() => comparer.Handle(fileA, fileB), Throws.Exception);
}
public void Test_Comparison_Is_Valid_For_Same_File_Sizes()
{
// This test expects the files to be of equal length and must not fail
var mockIo = Substitute.For <IIO>();
var comparer = new FileSizeComparer();
comparer.Init(mockIo);
var fileA = "a.file";
var fileB = "different.foo";
Assert.That(comparer.WantsToHandle(fileA), Is.True);
Assert.That(comparer.WantsToHandle(fileB), Is.True);
// Mock the io to check for file size only
mockIo.ReadFile(fileA).Returns(MakeStreamFromString("123"));
mockIo.ReadFile(fileB).Returns(MakeStreamFromString("abc"));
Assert.That(() => comparer.Handle(fileA, fileB), Throws.Nothing);
}