public void TestTheThing()
{
var predicate = TheThing.IsDivisibleBy(2);
Assert.IsTrue(predicate(4));
Assert.IsFalse(predicate(3));
predicate = TheThing.IsPositive();
Assert.IsTrue(predicate(1));
Assert.IsFalse(predicate(0));
Assert.IsFalse(predicate(-1));
predicate = TheThing.IsNegative();
Assert.IsFalse(predicate(1));
Assert.IsFalse(predicate(0));
Assert.IsTrue(predicate(-1));
predicate = TheThing.IsBetween(10, 20);
Assert.IsTrue(predicate(10));
Assert.IsTrue(predicate(15));
Assert.IsTrue(predicate(20));
Assert.IsFalse(predicate(9));
Assert.IsFalse(predicate(21));
predicate = TheThing.IsGreaterThan(5);
Assert.IsFalse(predicate(4));
Assert.IsFalse(predicate(5));
Assert.IsTrue(predicate(6));
predicate = TheThing.IsGreaterThanOrEqualTo(5);
Assert.IsFalse(predicate(4));
Assert.IsTrue(predicate(5));
Assert.IsTrue(predicate(6));
predicate = TheThing.IsLessThan(5);
Assert.IsTrue(predicate(4));
Assert.IsFalse(predicate(5));
Assert.IsFalse(predicate(6));
predicate = TheThing.IsLessThanOrEqualTo(5);
Assert.IsTrue(predicate(4));
Assert.IsTrue(predicate(5));
Assert.IsFalse(predicate(6));
var stringPredicate = TheThing.Is("Hello");
Assert.IsTrue(stringPredicate("Hello"));
Assert.IsFalse(stringPredicate("hello"));
stringPredicate = TheThing.IsNot("Hello");
Assert.IsFalse(stringPredicate("Hello"));
Assert.IsTrue(stringPredicate("hello"));
}
