Hi I need to write test class for this please tell me how to write.It has reports and dashboards.
public class Embedded_Analytics_Extn{
    
    public Id AccPlanId{get; set;}
    public GE_HQ_Account_Plan__c aPlan{get;set;}
    public String DashId{get; set;}
    public String Report0Id{get; set;}
    public String Report0Name{get; set;}
    public String Report1Id{get; set;}
    public String Report1Name{get; set;}
    public String Report2Id{get; set;}
    public String Report2Name{get; set;}
    public String Report3Id{get; set;}
    public String Report3Name{get; set;}
    public String Report4Id{get; set;}
    public String Report4Name{get; set;}
    public String Report5Id{get; set;}
    public String Report5Name{get; set;}
    public String Report6Id{get; set;}
    public String Report6Name{get; set;}
    
    public String AccPlanName{get; set;}
    Public String DDUNS{get; set;}
    public List<SelectOption> tiers{get;set;}
    public String tier2{get;set;}
    public String tier3{get;set;}
    public String accName{get;set;}
    public Embedded_Analytics_Extn(ApexPages.StandardController controller){
        //Report r0=[select id,name,developerName from Report where developerName='TOTAL_CurrYr_IFRU'];
        //Report0Id=r0.id;
        //Report0Name=r0.name;
        Report r1=[select id,name,developerName from Report where developerName='OG_Tier_1_O_G_Region_Current_Year'];
        Report1Id=r1.id;
        Report1Name=r1.name;
        Report r2=[select id,name,developerName from Report where developerName='OG_Forecast_by_PL_Current_Year'];
        Report2Id=r2.id;
        Report2Name=r2.name;
        Report r3=[select id,name,developerName from Report where developerName='OG_Tier_2_Account_Region_Current_Year'];
        Report3Id=r3.id;
        Report3Name=r3.name;
        Report r4=[select id,name,developerName from Report where developerName='OG_SalesMgr_Current_Year_OPEN'];
        Report4Id=r4.id;
        Report4Name=r4.name;
        Report r5=[select id,name,developerName from Report where developerName='OG_Oppty_by_Stage_Current_Year'];
        Report5Id=r5.id;
        Report5Name=r5.name;
        Report r6=[select id,name,developerName from Report where developerName='OG_SalesMgr_Current_Year_Forecast'];
        Report6Id=r6.id;
        Report6Name=r6.name;
                
        DashId=[select id,developerName from Dashboard where developerName='OG_Account_Plan_Dashboard'].id;
        List<DashboardComponent> comp=[select id,name from DashboardComponent where DashboardId=:DashId];
        Map<String,DashboardComponent> DashCompMap=new Map<String,DashboardComponent>();
        for(DashboardComponent c: comp){
            DashCompMap.put(c.name,c);    
        }
        this.aPlan=(GE_HQ_Account_Plan__c)controller.getRecord();
        GE_HQ_Account_Plan__c AccPlan=[select id,name,GE_HQ_DDUNS_fm__c,GE_HQ_DDUNS_Number__c from GE_HQ_Account_Plan__c where id=:aPlan.Id];
        
        AccPlanName=AccPlan.Name;
        DDUNS=AccPlan.GE_HQ_DDUNS_fm__c;
        Account acc=[select id,name from Account where id=:AccPlan.GE_HQ_DDUNS_Number__c];
        this.accName=acc.name;
        /*
        tiers=new List<SelectOption>();
        tiers.add(new SelectOption('','None'));
        tiers.add(new SelectOption('Turbo Machinery','Turbo Machinery'));
        tiers.add(new SelectOption('PII Pipeline Solutions','Pipeline Solutions'));
        tiers.add(new SelectOption('Global Services (GS)','Global Services'));
        tiers.add(new SelectOption('Mesurement & Control (M&C)','Mesurement & Control'));
        tiers.add(new SelectOption('Drilling & Surface (D&S)','Drilling & Surface'));
        tiers.add(new SelectOption('Subsea (SS)','Subsea'));
        */
    }
    
    public PageReference setTiers(){
        this.tier2=aPlan.GE_OG_Tier_2_P_L__c;
        this.tier3=aPlan.GE_OG_Tier_3_P_L__c;
        return null;
    }
    
}