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trying for code coverage for apex class

Apex class:
public class ContactSelectionLookupController
   public List<Contact> contactList{get;set;}
    public boolean showsearch {get;set;}
    public boolean showwithoutsearch {get;set;}
    public String assetId{get;set;}
    public List<EntitlementContact> entcon;
    public Set<ID> conids;
    public String keyword{get;set;}
    public String message{get;set;}
    public List<Contact> result{get;set;}
    public List<Contact> displaycontactlist {get;set;}
    public List<Contact> consearchlist {get;set;}
    //public String errormessage{get;set;}
    public ContactSelectionLookupController()
        consearchlist= new List<Contact>();
        entcon =new List<EntitlementContact>();
        showsearch =false;
        conids=new Set<ID>();
       entcon =[SELECT ContactId,EntitlementId,Entitlement.AssetId,Id,Name FROM EntitlementContact where Entitlement.AssetId =:assetId];
        for(EntitlementContact ec : entcon  )
        entcon =[SELECT ContactId,EntitlementId,Entitlement.AssetId,Id,Name FROM EntitlementContact where Entitlement.AssetId =:assetId];
        for(EntitlementContact ec : entcon  )
        contactList= new List<Contact>([Select id,Name,Account.Name,Email,Phone from Contact where Id IN : conids]);
            displaycontactlist = contactList;
            ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Enter Valid Account and Asset'));
      public PageReference search()
      if(keyword.length() > 0)
         String temp= keyword + '%';
         result=[select id,name,Account.name, Email,Phone from Contact where id in: conids and (Name like : temp or Email like : temp) ];
         //result=(List<Contact>)[FIND : keyword in All fields returning Contact(ID,Name,Account.Name,Email,Phone where id in : conids)][0];
             if(result.size() > 0)
             showsearch =true;
             showsearch =false;
             ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'No Contact Found'));
             showsearch =false;
             ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'At least one char is required to search'));
     return null;

Test class:
public class ContactSelectionLookupControllerTest
 public static testMethod void ContactSelectionLookupController(){
 Product2 ObjProduct = new Product2(
        Name = 'UNIT4 Business World',
        IsActive = true,
        Service__c = true,
        Family = 'Others');
    ObjProduct = (Product2) TestUtility.createAndValidateSObject(ObjProduct);
    SCMC__Currency_Master__c SCM =new SCMC__Currency_Master__c();
    SCM = (SCMC__Currency_Master__c)TestUtility.createAndValidateSObject(SCM);
    Account objAccount = new Account(
        name = 'abc',
        type = 'UNIT4 Company');
    objAccount = (Account)TestUtility.createAndValidateSObject(objAccount);
    Contact ObjContact = new contact(
        AccountId = objAccount.id,
        Lastname = 'tesContact',
        Email = 'Test@test.com');
    ObjContact = (Contact)TestUtility.createAndValidateSObject(ObjContact);
    Asset objAsset = new Asset(
        Name = 'abc',
        AccountId = objAccount.id,
        ContactId = ObjContact.id,
        Status = 'Purchased',
        Product2Id = ObjProduct.id);
    objAsset = (Asset)TestUtility.createAndValidateSObject(objAsset);
    category__c objFunctionalArea = new category__c(
        Name = TestUtility.LABEL_TEST ,
        Product__c = ObjProduct.id);
    objFunctionalArea = (category__c)TestUtility.createAndValidateSObject(objFunctionalArea);
    Sub_Module__c ObjSubModule = new Sub_Module__c(
        Name ='Reporting',
        Sub_Module__c = objFunctionalArea.id);
    ObjSubModule = (Sub_Module__c)TestUtility.createAndValidateSObject(ObjSubModule);
    Entitlement objEntitlement = new Entitlement(
        AssetId = objAsset.id,
        Name ='Entitlement For UNIT4 HRM Portal',
        AccountId = objAccount.id);
    objEntitlement = (Entitlement)TestUtility.createAndValidateSObject(objEntitlement);
    ProductVersion__c objProductVersion = new ProductVersion__c(
        Name = 'sdasd',
        Product__c = ObjProduct.id);
    objProductVersion = (ProductVersion__c)TestUtility.createAndValidateSObject(objProductVersion);
    ProductUpdate__c objProductUpdate = new ProductUpdate__c(
        Name = TestUtility.LABEL_TEST ,
        ProductVersion__c = objProductVersion.id);
    objProductUpdate = (ProductUpdate__c)TestUtility.createAndValidateSObject(objProductUpdate);
    Environment__c objEnvironment = new Environment__c(
        DB__c = 'ORACLE 11',
        OS__c = 'Windows 7',
        Product__c = ObjProduct.id,
        Type__c = 'Live',
        Active__c = true,
        Asset__c = objAsset.id,
        ProductVersion__c = objProductVersion.id,
        Update__c = objProductUpdate.id);
    objEnvironment = (Environment__c)TestUtility.createAndValidateSObject(objEnvironment);
  ContactSelectionLookupController con=new ContactSelectionLookupController();

Please help on this
Rahul KumarRahul Kumar (Salesforce Developers) 
Do You got a chance to check the Test generator app from App Exchange please check the below link Hope it will be helpful.

Please mark it as best answer if the information is informative.

Rahul Kumar
Amit Chaudhary 8Amit Chaudhary 8
I will recommend you to start using trailhead to learn about test classes
1) https://trailhead.salesforce.com/modules/apex_testing

Also please check below post
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_qs_test.htm
2) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_example.htm

Pleasse check below post sample test class
1) http://amitsalesforce.blogspot.com/2015/06/best-practice-for-test-classes-sample.html

You write a test class for this the same way that you would any other:
- Set up some data for the controller to access (Account, Contact etc)
- Execute a method/methods:- search
- Verify the behaviour with asserts.

Please try below sample test class.
public class ContactSelectionLookupControllerTest
	public static testMethod void ContactSelectionLookupController()
		Product2 ObjProduct = new Product2(
			Name = 'UNIT4 Business World',
			IsActive = true,
			Service__c = true,
			Family = 'Others');
		ObjProduct = (Product2) TestUtility.createAndValidateSObject(ObjProduct);
		SCMC__Currency_Master__c SCM =new SCMC__Currency_Master__c();
		SCM = (SCMC__Currency_Master__c)TestUtility.createAndValidateSObject(SCM);
		Account objAccount = new Account(
			name = 'abc',
			type = 'UNIT4 Company');
		objAccount = (Account)TestUtility.createAndValidateSObject(objAccount);
		Contact ObjContact = new contact(
			AccountId = objAccount.id,
			Lastname = 'tesContact',
			Email = 'Test@test.com');
		ObjContact = (Contact)TestUtility.createAndValidateSObject(ObjContact);
		Asset objAsset = new Asset(
			Name = 'abc',
			AccountId = objAccount.id,
			ContactId = ObjContact.id,
			Status = 'Purchased',
			Product2Id = ObjProduct.id);
		objAsset = (Asset)TestUtility.createAndValidateSObject(objAsset);
		category__c objFunctionalArea = new category__c(
			Name = TestUtility.LABEL_TEST ,
			Product__c = ObjProduct.id);
		objFunctionalArea = (category__c)TestUtility.createAndValidateSObject(objFunctionalArea);
		Sub_Module__c ObjSubModule = new Sub_Module__c(
			Name ='Reporting',
			Sub_Module__c = objFunctionalArea.id);
		ObjSubModule = (Sub_Module__c)TestUtility.createAndValidateSObject(ObjSubModule);
		Entitlement objEntitlement = new Entitlement(
			AssetId = objAsset.id,
			Name ='Entitlement For UNIT4 HRM Portal',
			AccountId = objAccount.id);
		objEntitlement = (Entitlement)TestUtility.createAndValidateSObject(objEntitlement);
		ProductVersion__c objProductVersion = new ProductVersion__c(
			Name = 'sdasd',
			Product__c = ObjProduct.id);
		objProductVersion = (ProductVersion__c)TestUtility.createAndValidateSObject(objProductVersion);
		ProductUpdate__c objProductUpdate = new ProductUpdate__c(
			Name = TestUtility.LABEL_TEST ,
			ProductVersion__c = objProductVersion.id);
		objProductUpdate = (ProductUpdate__c)TestUtility.createAndValidateSObject(objProductUpdate);
		Environment__c objEnvironment = new Environment__c(
			DB__c = 'ORACLE 11',
			OS__c = 'Windows 7',
			Product__c = ObjProduct.id,
			Type__c = 'Live',
			Active__c = true,
			Asset__c = objAsset.id,
			ProductVersion__c = objProductVersion.id,
			Update__c = objProductUpdate.id);
		objEnvironment = (Environment__c)TestUtility.createAndValidateSObject(objEnvironment);
		ContactSelectionLookupController con=new ContactSelectionLookupController();

Please follow below salesforce Best Practice for Test Classes :-

1. Test class must start with @isTest annotation if class class version is more than 25
2. Test environment support @testVisible , @testSetUp as well
3. Unit test is to test particular piece of code working properly or not .
4. Unit test method takes no argument ,commit no data to database ,send no email ,flagged with testMethod keyword .
5. To deploy to production at-least 75% code coverage is required
6. System.debug statement are not counted as a part of apex code limit.
7. Test method and test classes are not counted as a part of code limit
9. We should not focus on the  percentage of code coverage ,we should make sure that every use case should covered including positive, negative,bulk and single record .
Single Action -To verify that the the single record produces the correct an expected result .
Bulk action -Any apex record trigger ,class or extension must be invoked for 1-200 records .
Positive behavior : Test every expected behavior occurs through every expected permutation , i,e user filled out every correctly data and not go past the limit .
Negative Testcase :-Not to add future date , Not to specify negative amount.
Restricted User :-Test whether a user with restricted access used in your code .
10. Test class should be annotated with @isTest .
11 . @isTest annotation with test method  is equivalent to testMethod keyword .
12. Test method should static and no void return type .
13. Test class and method default access is private ,no matter to add access specifier .
14. classes with @isTest annotation can't be a interface or enum .
15. Test method code can't be invoked by non test request .
16. Stating with salesforce API 28.0 test method can not reside inside non test classes .
17. @Testvisible annotation to make visible private methods inside test classes.
18. Test method can not be used to test web-service call out . Please use call out mock .
19. You can't  send email from test method.
20.User, profile, organization, AsyncApexjob, Corntrigger, RecordType, ApexClass, ApexComponent ,ApexPage we can access without (seeAllData=true) .
21. SeeAllData=true will not work for API 23 version eailer .
22. Accessing static resource test records in test class e,g List<Account> accList=Test.loadData(Account,SobjectType,'ResourceName').
23. Create TestFactory class with @isTest annotation to exclude from organization code size limit .
24. @testSetup to create test records once in a method  and use in every test method in the test class .
25. We can run unit test by using Salesforce Standard UI,Force.com IDE ,Console ,API.
26. Maximum number of test classes run per 24 hour of period is  not grater of 500 or 10 multiplication of test classes of your organization.
27. As apex runs in system mode so the permission and record sharing are not taken into account . So we need to use system.runAs to enforce record sharing .
28. System.runAs will not enforce user permission or field level permission .
29. Every test to runAs count against the total number of DML issued in the process .

Please let us know if this post will help you