public void EvaluateNameExpression()
{
NameExpression expression = new NameExpression("foo");
BindingEnvironment environment = new BindingEnvironment();
environment.SetValue("foo", "bar");
Assert.AreEqual("bar", expression.Evaluate(environment));
}
public void EvaluateNameWithNull()
{
NameExpression expression = new NameExpression("foo");
BindingEnvironment environment = new BindingEnvironment();
environment.SetValue("foo", null);
Assert.IsNull(expression.Evaluate(environment));
}
public void RaiseIfNameIsUndefined()
{
NameExpression expression = new NameExpression("foo");
BindingEnvironment environment = new BindingEnvironment();
try
{
expression.Evaluate(environment);
Assert.Fail("Exception expected");
}
catch (Exception ex)
{
Assert.IsInstanceOfType(ex, typeof(NameError));
Assert.AreEqual("name 'foo' is not defined", ex.Message);
}
}
public void CreateAndEvaluateParameterExpressionWithNameAndDefaultExpression()
{
var environment = new BindingEnvironment();
environment.SetValue("b", 1);
var defaultExpression = new NameExpression("b");
var expression = new ParameterExpression("a", defaultExpression, false);
var result = expression.Evaluate(environment);
Assert.IsNotNull(result);
Assert.IsInstanceOfType(result, typeof(Parameter));
var param = (Parameter)result;
Assert.AreEqual("a", expression.Name);
Assert.AreEqual(defaultExpression, expression.DefaultExpression);
Assert.IsFalse(expression.IsList);
Assert.AreEqual("a", param.Name);
Assert.AreEqual(1, param.DefaultValue);
Assert.IsFalse(param.IsList);
}