Testing a visualforce page

Controller class

public class TastingProductClass {
    public Tasting_Product__c prod {get; set; }
    String prodId;
    String tasteId;
    String retUrl;
    public TastingProductClass(ApexPages.StandardController stdcon) {
        prodId = ApexPages.currentPage().getParameters().get('id');
        tasteId = ApexPages.currentPage().getParameters().get('CF00N50000003LHz0_lkid');
        retUrl = ApexPages.currentPage().getParameters().get('retUrl');
        if(prodId!= NULL && prodId !='') {
            this.prod = (Tasting_Product__c)stdcon.getRecord();
        } else {
            prod = new Tasting_Product__c();
            prod.Tasting__c = tasteId;
        }
    }
    public PageReference Save() {
        upsert(prod);
        Tasting__c taste = new Tasting__c(id=tasteId);
        PageReference page = new ApexPages.StandardController(taste).View();
        return page;
     //   return null;
    }
    public PageReference Cancel() {
        return null;
    }
    public PageReference SaveNew() {
        upsert(prod);
        prod = new Tasting_Product__c();
        prod.Tasting__C = tasteId;
        PageReference page = new ApexPages.StandardController(prod).view();
        return page;
    }
}

Testing Class

@isTest
public class TastingProductTest {
static list<Client_Plan__c> client;
    @isTest static public void TestTastingProduct() {
	Account acct = new Account(name = 'test');
    Tasting__c taste = new Tasting__c(Name = 'test', Account__c = acct.id);
    Tasting_Product__c prod = new Tasting_Product__c (Tasting__c = taste.id);
    test.startTest();    
    //Instantiate and construct the controller class.
    ApexPages.currentPage().getParameters().put('id', prod.id); 
    ApexPages.StandardController myPlan = new ApexPages.StandardController(prod);
    TastingProductClass controller = new TastingProductClass(myPlan);
    controller.save();  //getting an error here
    controller.saveNew();
    controller.Cancel();
    test.stopTest();    
    }    
}

The actual visualforce page

<apex:page standardController="Tasting_Product__c" extensions="TastingProductClass" >
    <apex:pageblock >
        <apex:form >
            <apex:commandButton value="Save" Action="{!save}"/>
            <apex:commandButton value="Cancel" Action="{!cancel}"/>
    <apex:pageblocktable value="{!prod}" var="pd">
    <apex:column >    
        <apex:facet name="header">Brand</apex:facet>
        <apex:inputfield value="{!pd.Brand__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Tier</apex:facet>
        <apex:inputfield value="{!pd.Tier__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Variety</apex:facet>
        <apex:inputfield value="{!pd.Variety__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Retail Price</apex:facet>
        <apex:inputfield value="{!pd.Retail_Price__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Samples Given</apex:facet>
        <apex:inputfield value="{!pd.Samples_Given__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Bottles Sold</apex:facet>
        <apex:inputfield value="{!pd.Bottles_Sold__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Product Placement</apex:facet>
        <apex:inputfield value="{!pd.Product_Placement__c}" />
     </apex:column>
    <apex:column >    
        <apex:facet name="header">Consumer Comments</apex:facet>
        <apex:inputfield value="{!pd.Consumer_Comments__c}" />
     </apex:column>        
    </apex:pageblocktable>
        </apex:form>
    </apex:pageblock>
</apex:page>