Hi guys. I am learning force.com and currently  i am using developer account so I necessarily don't have to write testclass for a now but when i will be on project i have to write down test method to deployee it to production envirionment from developer environment. I have written some test classes for triggers but i don't know how to write testmethod for visualforce custome controller class. my code is successfully working but I also want to write test class with cover more than 75%. i am pasting my code bellow can you guys help me out with its test class.

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public with sharing class searchPatientAccount {
// the soql without the order and limit
  private String soql {get;set;}
  // the collection of contacts to display
  public List<Account> accounts {get;set;}
 
  // the current sort direction. defaults to asc
  public String sortDir {
    get  { if (sortDir == null) {  sortDir = 'asc'; } return sortDir;  }
    set;
  }
 
  // the current field to sort by. defaults to last name
  public String sortField {
    get  { if (sortField == null) {sortField = 'name'; } return sortField;  }
    set;
  }
 
  // format the soql for display on the visualforce page
  public String debugSoql {
    get { return soql + ' order by ' + sortField + ' ' + sortDir + ' limit 20'; }
    set;
  }
 
  // init the controller and display some sample data when the page loads
  public searchPatientAccount() {
    soql = 'select a.id, a.name, a.accountnumber,a.phone from account a where a.name != null';
    runQuery();
  }
 
  // toggles the sorting of query from asc<-->desc
  public void toggleSort() {
    // simply toggle the direction
    sortDir = sortDir.equals('asc') ? 'desc' : 'asc';
    // run the query again
    runQuery();
  }
 
  // runs the actual query
  public void runQuery() {
 
    try {
      accounts = Database.query(soql + ' order by ' + sortField + ' ' + sortDir + ' limit 20');
    } catch (Exception e) {
      ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Ooops!'));
    }
 
  }
 
  // runs the search with parameters passed via Javascript
  public PageReference runSearch() {
 
    String accountname = Apexpages.currentPage().getParameters().get('accountname');
    String accountnumber = Apexpages.currentPage().getParameters().get('accountnumber');
    String phone = Apexpages.currentPage().getParameters().get('phone');
   // String technology = Apexpages.currentPage().getParameters().get('technology');
 
    soql = 'select a.id, a.name, a.accountnumber,a.phone from account a where a.name != null';
    if (!accountname.equals(''))
      soql += ' and a.name LIKE \''+String.escapeSingleQuotes(accountname)+'%\'';
    if (!accountnumber.equals(''))
      soql += ' and a.accountnumber LIKE \''+String.escapeSingleQuotes(accountnumber)+'%\'';
    if (!phone.equals(''))
      soql += ' and a.phone LIKE \''+String.escapeSingleQuotes(phone)+'%\'';  

 
    // run the query again
    runQuery();
 
    return null;
  }
 
  // use apex describe to build the picklist values
  public List<String> technologies {
    get {
      if (technologies == null) {
 
        technologies = new List<String>();
        Schema.DescribeFieldResult field = Contact.interested_technologies__c.getDescribe();
 
        for (Schema.PicklistEntry f : field.getPicklistValues())
          technologies.add(f.getLabel());
 
      }
      return technologies;          
    }
    set;
  }
}

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