c# - Entity Framework does not recognize many to many relationship with custom join table -

i've got 3 tables/entities

public class test {     public int id {get; set;}      public virtual icollection<testquestion> testquestions { get; set;}      public virutal icollection<question> questions {get; set;} }  public class question {     public int id {get; set;}      public virtual icollection<testquestion> testquestions { get; set;}      public virutal icollection<test> test {get; set;} }  public class testquestion {     public int id {get; set;}      public int testid { get; set; }      public virtual test test { get; set; }      public int questionid { get; set; }      public virtual question question { get; set; }      public int order { get; set; } } 

and context containing dbset set each of them. entity framework not recognize testquestion join table.

    modelbuilder.entity<question>()         .hasmany(x => x.tests)         .withmany(y => y.questions); 

i have tried doing configuration using map ef tries create new table instead of using custom. why not recognize join table during query tests , questions collection empty , testquestion collection not.