Replace "New" page with visualforce page with apex extension

New record Visualforce replacement

<apex:page standardController="Leave_Request__c" extensions="vacationdays" showHeader="true" sidebar="true">
  <apex:form >
    <apex:sectionHeader subtitle="New Leave Request" title="Leave Request Edit"/>
    <apex:pageBlock title="Leave Request Edit" mode="edit" >
      <apex:pageBlockButtons >
        <apex:commandButton value="Save" action="{!save}"/>
        <apex:commandButton value="Cancel" action="{!cancel}"/>
        </apex:pageBlockButtons>
        <apex:pageBlockSection title="Information" >
        <apex:outputField label="Owner" value="{!UserInfo.Name}"/>
        <apex:inputField value="{!Leave_Request__c.Manager__c}"/>
        <apex:inputField value="{!Leave_Request__c.Dates_of_Requested_Leave__c}" required="true"/>
        <apex:inputField value="{!Leave_Request__c.Status__c}" required="true"/>
        <apex:inputField value="{!Leave_Request__c.Type__c}" required="true"/>
        <apex:outputField label="Total Vacation Days Allowed" value=" {!UserInfo.Yearly_Vacation_Days__c}"/>
        <apex:inputField value="{!Leave_Request__c.Total_Days_Off__c}" required="true"/>
        <apex:outputField label="Remaining Vacation Days" value=" {!UserInfo.Vacation_Days__c}"/>
        <apex:inputField value="{!Leave_Request__c.Comments__c}"/>
      </apex:pageBlockSection>
    </apex:pageBlock>
  </apex:form>
</apex:page>

Visualforce Extension

public class vacationdays {
  Public User CurrentUser {get;set;}
    public vacationdays(ApexPages.StandardController controller) {

    }
  public User getUserInfo(){
    String userid = UserInfo.getUserId();
     CurrentUser = [SELECT ID, Name, FirstName, LastName, Vacation_Days__c, Yearly_Vacation_Days__c FROM User WHERE Id =:userid];
   return CurrentUser;
  }
}

Visualforce Extension Test

@isTest
private class vacationdaysTEST{
private static testMethod void vacationdaysTEST(){
    Leave_Request__c lr  = new Leave_Request__c();
    ApexPages.StandardController sc = new ApexPages.StandardController(lr);
    vacationdays controller = new vacationdays(sc);
        controller.getUserInfo();
}
}