So I was going to accept the first answer but it has been deleted.

 To sum it up
In a given iteration :

 
1. Write unit-test
    
 
2. Write production code
    
 
3. Write Integration tests to test interactions

Keep in mind integration testing while 1) and 2) to guarantee testability at the integration level.

So I was going to accept the first answer but it has been deleted.
To sum it up
In a given iteration :

 
1. Write unit-test
 
2. Write production code
 
3. Write Integration tests to test interactions

Keep in mind integration testing while 1 and 2 to guarantee testability at the integration level.

Integration tests are not necessarily written end to end at step 3 they may be partially written between step 1 and 2.

So I was going to accept the first answer but it has been deleted.

To sum it up :

1. Write unit-test
   
2. Write production code
   
3. Write Integration tests to test interactions

Keep in mind integration testing while 1) and 2) to guarantee testability at the integration level.

So I was going to accept the first answer but it has been deleted.

To sum it up
In a given iteration :

1. Write unit-test
   
2. Write production code
   
3. Write Integration tests to test interactions

Keep in mind integration testing while 1) and 2) to guarantee testability at the integration level.