I am new in creating test class for Flow. Please help me create a test class for my record triggered flow.
Process: There should be a contact and a contact should have a Machine Registration object (lookup to Contact) and Machine Registration Object has a Master-Detail relationship with Warranty Object.

Object: Warranty
A record is created
Formula Evaluates to True (New)
      {!$User.CSS_Disableworkflows__c} = false
Fast Field Updates


 Decision 1:
Formula Resource:
Boolean
Warrantytypeandnowarrantyalready Formula:
AND(
$User.CSS_Disableworkflows__c = false,
OR(
{!$Record.CSS_WarrantyType__r.CSS_WarrantyCode__c} ={!$Label.CSS_ThirdPartyWarranty},
{!$Record.CSS_WarrantyType__r.CSS_WarrantyCode__c} ={!$Label.CSS_ExchangeWarranty}, 
AND(
{!$Record.CSS_WarrantyType__r.CSS_WarrantyCode__c} ={!$Label.CSS_GoodwillWarranty},
(ISBLANK({!$Record.CSS_MachineRegistration__r.CSS_WarrantyEndDate__c} ) ) 
)
)
)

Decision 1 => Update Record

Decision 2:
Formula Resource:
Boolean
WarrantytypeandWarrantylalreadypresentcheck Formula:
AND(
$User.CSS_Disableworkflows__c = false,
AND(
{!$Record.CSS_WarrantyType__r.CSS_WarrantyCode__c} ={!$Label.CSS_GoodwillWarranty},
NOT(ISBLANK({!$Record.CSS_MachineRegistration__r.CSS_WarrantyEndDate__c} ) ) 
)
)

Decision 2 => Update Record
CSS_StartDate_C = Machine_Registration_r.Warranty_EndDate_c