testing - Predefined mock response in Spock -

i'm new spock , question refers example on page 178 of java testing spock. class under test basket class shopping application, , method of class being tested canshipcompletely()

public class basket {   private warehouseineventory warehouseinventory;   private shippingcalculator shippingcalculator;   protected map<product, integer> contents = new hashmap<>();   ...    public void addproduct(product product) {     addproduct(product, 1);   }    public void addproduct(product product, int times) {     if (contents.containskey(product)) {       int existing = contents.get(product);       contents.put(product, existing + times);     } else {       contents.put(product, times);     }   }    public boolean canshipcompletely() {     if(warehouseinventory.isempty()) return false;      try {       (entry<product, integer> entry : contents.entryset())          boolean ok = warehouseinventory.isproductavailable(                                   entry.getkey().getname(),                                    entry.getvalue()                                   );         if (!ok) {           return false;         }     }       return true;     } catch (exception e) {       return false;     }    ... } 

this method canshipcompletely() loops on items in basket (in map contents) , each item, makes call warehouseinventory.isproductavailable(product, count) see if there sufficient stock in warehouse fill order. warehouse class collaborator of basket class mocked in following test

def "warehouse queried each product"() {     given: "a basket, tv , camera"     product tv = new product(name:"bravia",price:1200,weight:18)     product camera = new product(name:"panasonic",price:350,weight:2)     basket basket = new basket()      and: "a warehouse limitless stock"     warehouseinventory inventory = mock(warehouseinventory)     basket.setwarehouseinventory(inventory)      when: "user checks out 2 products"     basket.addproduct tv     basket.addproduct camera     boolean readytoship = basket.canshipcompletely()      then: "order can shipped"     readytoship     2 * inventory.isproductavailable( _ , _) >> true     0 * inventory.preload(_ , _) } 

the then: block verifies boolean readytoship true, , inventory.isproducavailable() called twice , inventory.preload() not called @ all. next last line both checking behavior of mock , telling return true calls isproductavailable(). don't understand test fail if move mock predefined response and: block follows

def "warehouse queried each product"() {     given: "a basket, tv , camera"     product tv = new product(name:"bravia",price:1200,weight:18)     product camera = new product(name:"panasonic",price:350,weight:2)     basket basket = new basket()      and: "a warehouse limitless stock"     warehouseinventory inventory = mock(warehouseinventory)      // ******** move mock predefined response here  **********     inventory.isproductavailable( _ , _ ) >> true              basket.setwarehouseinventory(inventory)      when: "user checks out 2 products"     basket.addproduct tv     basket.addproduct camera     boolean readytoship = basket.canshipcompletely()      then: "order can shipped"     readytoship     2 * inventory.isproductavailable( _ , _)     0 * inventory.preload(_ , _) } 

the failure few calls isproductavailable():

too few invocations for:

2 * inventory.isproductavailable( _ , _) (1 invocation)

unmatched invocations (ordered similarity):

1 * inventory.isempty()

i don't understand why predefined behavior mock can't moved and: block.

please refer documentation

when mocking , stubbing same method call, have happen in same interaction. in particular, following mockito-style splitting of stubbing , mocking 2 separate statements not work:

setup: subscriber.receive("message1") >> "ok"  when: publisher.send("message1")  then: 1 * subscriber.receive("message1") 

as explained in declare interactions, receive call first matched against interaction in then: block. since interaction doesn’t specify response, default value method’s return type (null in case) returned. (this facet of spock’s lenient approach mocking.). hence, interaction in setup: block never chance match.