public void Given_never_before_seen_text()
{
var detector = new SpamDetector();
var corpus = Corpus.OfText("some text");
Assert.That(!detector.IsSpam(corpus), "should be ham.");
}
public void Given_text_marked_as_spam_then_marked_as_ham()
{
var detector = new SpamDetector();
var spamCorpus = Corpus.OfText("this is totally NOT spam");
detector.SpamFound(spamCorpus);
detector.HamFound(spamCorpus);
Assert.That(!detector.IsSpam(spamCorpus), "should not be spam");
}
public void Given_a_corpus_that_is_half_spam_and_half_unknown()
{
var detector = new SpamDetector();
detector.SpamFound(Corpus.OfText("a b"));
var result = detector.IsSpam(Corpus.OfText("a b c d"));
Assert.That(result, "should be whatever");
}
public void Given_text_previously_marked_as_spam()
{
var detector = new SpamDetector();
var corpus = Corpus.OfText("some text");
detector.SpamFound(corpus);
var isSpam = detector.IsSpam(corpus);
Assert.That(isSpam, "should be spam");
}
public void Given_text_that_has_an_equivalent_number_of_ham_and_spam()
{
var detector = new SpamDetector();
var ham = Corpus.OfText("a b");
var spam = Corpus.OfText("c d");
detector.HamFound(ham);
detector.SpamFound(spam);
var result = detector.IsSpam(Corpus.OfText("a b c d"));
Assert.That(!result, "should not be spam");
}
public void Given_a_corpus_that_is_heavily_weighted_towards_being_spam()
{
var ham = Corpus.OfText("a b");
var spam = Corpus.OfText("a b c d");
var detector = new SpamDetector();
detector.HamFound(ham);
detector.SpamFound(spam);
var result = detector.IsSpam(Corpus.OfText("a b c d"));
Assert.That(result, "should be spam.");
}
public void Given_text_that_has_known_ham_and_unknown_words()
{
var detector = new SpamDetector();
var ham = Corpus.OfText("this is totally ham");
var mysteryMeat = Corpus.OfText("this is all wtf");
detector.HamFound(ham);
var result = detector.IsSpam(mysteryMeat);
Assert.That(!result, "should be ham");
}