public void TestGetValue()
{
var lEx = new LiteralExpression("somevalue");
Assert.Equal("somevalue", lEx.GetValue());
Assert.Equal("somevalue", lEx.GetValue(typeof(string)));
var ctx = new StandardEvaluationContext();
Assert.Equal("somevalue", lEx.GetValue(ctx));
Assert.Equal("somevalue", lEx.GetValue(ctx, typeof(string)));
Assert.Equal("somevalue", lEx.GetValue(new Rooty()));
Assert.Equal("somevalue", lEx.GetValue(new Rooty(), typeof(string)));
Assert.Equal("somevalue", lEx.GetValue(ctx, new Rooty()));
Assert.Equal("somevalue", lEx.GetValue(ctx, new Rooty(), typeof(string)));
Assert.Equal("somevalue", lEx.ExpressionString);
Assert.False(lEx.IsWritable(new StandardEvaluationContext()));
Assert.False(lEx.IsWritable(new Rooty()));
Assert.False(lEx.IsWritable(new StandardEvaluationContext(), new Rooty()));
}