Call Test Class

 PageReference pageref = Page.ProcessSingleLeadInquiryIntegraton;
        Test.setCurrentPage(pageRef);
        Apexpages.currentPage().getParameters().put('id',integ.Id); 
        ApexPages.StandardController stdAct = new ApexPages.StandardController(integ);
        LeadInquiryIntegrationExt leadinquiry = new LeadInquiryIntegrationExt(stdAct);
        
        leadinquiry.proceedSingleLeadInquryIntegration();
        leadinquiry.proceedAllNewLeadInquryIntegrations();