public void GetDiffExpressions()
{
var t_CommonExpression = new IdentifierExpression();
var t_State = new ParseState(new Stack <Token>(),
new List <IExpression> {
t_CommonExpression
});
var t_CopyState = new ParseState(new Stack <Token>(),
new List <IExpression> {
t_CommonExpression, new OperatorExpression()
});
var t_Expressions = t_CopyState.DiffExpressions(t_State);
t_Expressions.Should().HaveCount(1);
t_Expressions.Should().OnlyContain(E => E.GetType() == typeof(OperatorExpression));
}
