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Unit test for a list


I'm trying to write a test class for this apex class :
Public with sharing class SOSLController{
 Public List<contact> conList{get;set;}
 Public List<account> accList{get;set;}
 Public String searchStr{get;set;}
   Public SOSLController(){
  Public void soslDemo_method(){
   conList = New List<contact>();
   accList = New List<account>();
   if(searchStr.length() > 1){
   String searchStr1 = '*'+searchStr+'*';
   String searchQuery = 'FIND \'' + searchStr1 + '\' IN ALL FIELDS RETURNING  Account (Id,Name,type),Contact(name,email)';
   List<List <sObject>> searchList = search.query(searchQuery);
   accList = ((List<Account>)searchList[0]);
   conList  = ((List<contact>)searchList[1]);
   if(accList.size() == 0 && conList.size() == 0 ){
       apexPages.addmessage(new apexpages.message(apexpages.severity.Error, 'Sory, no results returned with matching string..'));
   apexPages.addmessage(new apexpages.message(apexpages.severity.Error, 'Please enter at least two characters..'));

I havn't write this class, and being a begginer in Salesforce I struggle to really understand it but I have to write the test class corresponding...
I need your help beacause I don't know how to do that. I try some things but it doesn't work, I get an error saying System.QueryException: List has no rows for assignment to SObject

I need to know how make test on a list of account or a list of contact. Do I need to create, for examle, 2 contact and 2 account and make a list with that ? How can I do that ? 

Thank you for your help !
Amit Chaudhary 8Amit Chaudhary 8
Please check below blog. how to write the test classes in salesforce

Please try below test clss. i hope that will help u
public class ControllerTestClass 
	static testMethod void testMethod1() 
		Account testAccount = new Account();
		testAccount.Name='test' ;
		insert testAccount;

		Contact cont = new Contact();	
		cont.firstName ='test';
		cont.lastName = 'test';
		insert cont;
		Id[] fixedSearchResults = new Id[2];
		fixedSearchResults[0] = testAccount.Id;
        fixedSearchResults[1] = cont.Id;
		SOSLController obj = new SOSLController();
		obj.searchStr ='test';
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

Thank you Amit,

That help me a lot !
I tried the code you gave in your answer, but it gives me an error when I run the test : 
System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_EXECUTE_FLOW_TRIGGER
The error is indicate at the line 
insert cont;

Amit Chaudhary 8Amit Chaudhary 8
Do you have any Process Builder on contact object. IF yes then please deactivate and try again