I have a controller that I wrote to extend the Opportunity standard controller.  Essentially it supports a VF page that gives a list of Opportunities that fit custom criteria and allow you to update some fields on those opportunities.  Like an editable list view.

The code is working great, but I can't seem to get ANY test coverage.  I am still very new at controllers, only modifying them up until this point, so I've culled together some things that I thought should work.

Controller Extension:

public with sharing class myContractController {

List<Opportunity> lstOpportunity;

Integer numDays = integer.valueOf(ApexPages.currentPage().getParameters().get('days'));

Date dtStart = date.today();

Date dtEnd = dtStart.addDays(numDays);

public myContractController(ApexPages.StandardController controller) {

lstOpportunity = (List<Opportunity>)[Select Id, Name, Hold_MR_Follow_up__c, ContractEndDate__c, StageName, Maintenance_Email__c, Special_Handling__c

From Opportunity

where Hold_MR_Follow_up__c = false AND IsClosed = false AND ContractEndDate__c > :dtStart AND ContractEndDate__c < :dtEnd ORDER BY ContractEndDate__c ASC];

}

public List<Opportunity> getlstOpportunity(){

return lstOpportunity;

}

public PageReference save() {

update lstOpportunity;

return ApexPages.currentPage();

}

}

 VF Page:

<apex:page standardController="Opportunity" extensions="myContractController">

<apex:form >

<apex:sectionHeader title="Opportunities with Contract End Dates within {!$CurrentPage.parameters.days} days"/>

<apex:pageBlock mode="edit">

<apex:pageMessages />

<apex:pageBlockSection title="Opportunities" >

<apex:pageblocktable value="{!lstOpportunity}" var="AC" id="opportunityTable">

<apex:column headerValue="Hold MR Follow Up">

<apex:inputField value="{!AC.Hold_MR_Follow_up__c}" />

</apex:column>

<apex:column headerValue="Opportunity">

<apex:outputLink value="/{!AC.Id}" style="white-space:nowrap;" target="_blank">{!AC.Name}</apex:outputLink>

</apex:column>

<apex:column value="{!AC.ContractEndDate__c}"></apex:column>

<apex:column headerValue="Stage" style="white-space:nowrap;">

<apex:outputField value="{!AC.StageName}"></apex:outputField>

</apex:column>

<apex:column value="{!AC.Special_Handling__c}"></apex:column>

<apex:column value="{!AC.Maintenance_Email__c}"></apex:column>

</apex:pageblocktable>

</apex:pageBlockSection>

<apex:pageBlockButtons location="bottom">

<apex:commandButton value="Save" action="{!save}"/>

<apex:commandButton value="Cancel" action="{!cancel}"/>

</apex:pageBlockButtons>

<apex:pageBlockSection title="Links">

<apex:outputLink value="/apex/MRChecklist?days=67">67 Day Checklist</apex:outputLink><br/><br/>

<apex:outputLink value="/apex/MRChecklist?days=37">37 Day Checklist</apex:outputLink><br/><br/>

<apex:outputLink value="/apex/MRChecklist?days=21">21 Day Checklist</apex:outputLink><br/><br/>

<apex:outputLink value="/apex/MRChecklist?days=14">14 Day Checklist</apex:outputLink><br/><br/>

</apex:pageBlockSection>

</apex:pageBlock>

</apex:form>

</apex:page>

 And my attempt at a test class:

public class myContractControllerTest {

public static testMethod void testmyContractController() {

Opportunity o = new Opportunity(name='testOpp', closeDate=date.Today(),Hold_MR_Follow_up__c=false, ContractEndDate__c=date.today().addDays(20), StageName='Qualified', Maintenance_Email__c='bplum@tableausoftware.com', Special_Handling__c=false);

insert o;

ApexPages.StandardController oppCtrl = new ApexPages.Standardcontroller(o);

myContractController controller = new myContractController(oppCtrl);

PageReference testPageRef = new PageReference('/apex/MRChecklist');

Test.setCurrentPage(testPageRef);

String nextPage = controller.save().getUrl();

System.assertEquals('/apex/failure?error=noParam', nextPage);

ApexPages.currentPage().getParameters().put('days', '67');

Test.setCurrentPage(testPageRef);

String myPage = controller.save().getUrl();

}

}