public void CanIsType()
{
var env = new StandardEnvironment();
Assert.IsTrue(env.IsType(null, "null"));
Assert.IsTrue(env.IsType(true, "boolean"));
Assert.IsTrue(env.IsType(1.25, "number"));
Assert.IsTrue(env.IsType("foo", "string"));
Assert.IsFalse(env.IsType(0, "null"));
Assert.IsFalse(env.IsType(0, "boolean"));
Assert.IsFalse(env.IsType("123", "number"));
Assert.IsFalse(env.IsType(123, "string"));
Assert.IsFalse(env.IsType(null, "boolean"));
Assert.IsFalse(env.IsType(null, "number"));
Assert.IsFalse(env.IsType(null, "string"));
// Case in type name is ignored:
Assert.IsTrue(env.IsType(null, "NULL"));
Assert.IsTrue(env.IsType(false, "Boolean"));
Assert.IsTrue(env.IsType(-500, "NuMbEr"));
Assert.IsTrue(env.IsType("", "STRING"));
// Unknown type name must throw an exception:
var ex = Assert.Catch <EvaluationException>(() => env.IsType("foo", "NoSuchType"));
Console.WriteLine(@"Expected: {0}", ex.Message);
}