android - Mocked method not returning value from test-local variable -

i have written test check if method adding , subtracting coins userdata preference method working correctly. mocked sharedpreferences class , using local variable coins stores coin amount.

however mocked getint() not seem return correct value of coins: running test addcoinvalid fails (expected: 5, actual: 0). i've made 2 outputs during test:

variable: 1 - mockedreturn: 0
variable: 5 - mockedreturn: 0

the left number value variable , right number mocked getint() returns.

can tell me what's going on? :o

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this test:

class userdatatest {     var coins = 0      val editor = mock<sharedpreferences.editor>()     val sharedprefs = mock<sharedpreferences> {         on{ getint("coins", 0) } doreturn coins         on { edit() } doreturn editor     }     val context = mock<context> {         on { getsharedpreferences("userdata", 0) } doreturn sharedprefs     }     val userdata = userdata(context)      @before     fun initeditormock() {         whenever(editor.clear()).thenreturn(editor)         whenever(editor.putint(eq("coins"), any<int>())).thenanswer{ invocation ->             this.coins = invocation.getargument(1)             return@thenanswer editor         }     }      @test     fun addcoinvalid() {         userdata.setcoins(1)         println("variable: "+coins+" - mockedreturn: "+userdata.getcoins())          userdata.addcoins(5)         println("variable: "+coins+" - mockedreturn: "+userdata.getcoins())         assertequals(5, userdata.getcoins())     }     // ... } 

and class tested:

class userdata(context: context) {     val settings = context.getsharedpreferences("userdata", 0)      fun getcoins(): int {         return settings.getint("coins", 0)     }      fun setcoins(number: int) {         settings.edit().clear().putint("coins", number).apply()     }      fun addcoins(number: int) {         if(number < 0) {             return         }         var coins = settings.getint("coins", 0)         setcoins(coins+number)     } } 

when use doreturn coins, mockito saves value coins had @ mock set time, is, initial value 0, , returns saved value ignoring changes actual variable.

to make mock query variable each time function called, use doanswer { ... }:

on { getint("coins", 0) } doanswer { coins }