Why the coverage is 0% while the test passed?
Here is my class

public class InventoryReport {

      public List<AggregateResult> allproduct{get;set;}

     public InventoryReport() {

   allproduct = [      
      SELECT Product_Hiden_Name__c, UM__c ,SUM(On_Hand__c)onHand,  SUM(Pending__c)pending,  SUM(Available__c)avail 
      FROM Articles_Containers__c 
      WHERE IsOpened__c = 1
      GROUP BY Product_Hiden_Name__c , UM__c 
      HAVING SUM(On_Hand__c) >0 
      ORDER BY Product_Hiden_Name__c, UM__c limit 1000];
      }
}

The test is:

@Istest(SeeAllData=true)
public class InventoryReportTest{
static testMethod void TestInventoryReport(){
 Articles_Containers__c ac = new Articles_Containers__c();
          Product2 p = new Product2(Name ='TestProduct'); 
          insert p;
          
          Container__c c = new Container__c( Name = 'CMLU', Provenance__c='OTHER', Statut__c='Open');
          insert c;
          
          ac.Product__c=p.ID;
           ac.Unit_Weight__c = 45; 
           ac.Unit_Cost__c = 87;
            ac.Container__c= c.ID;
             ac.Number__c = 55;
            ac.UM__c ='UNIT(S)';    
           ac.Local_ID__c = 7888;
           ac.Comments__c = 'UNIT(S)';
           ac.Purpose__c='Consignment';
           ac.Condition__c= 'New';
           insert ac;   
}
}