Added stub extension function

with this method one can define mock for class

val someMock = mock<Object>()

and then define stubs in test

someMock.stub {
	on { something } doReturn somethingElse
}

It is useful when some tests reuse mock object but with different stubbing

mockito-kotlin/src/main/kotlin/com/nhaarman/mockito_kotlin/Mockito.kt

@@ -175,6 +175,8 @@ inline fun <reified T : Any> mock(
     KStubbing(this).stubbing(this)
 }!!
 
+inline fun <T : Any> T.stub(stubbing: KStubbing<T>.(T) -> Unit) = this.apply { KStubbing(this).stubbing(this) }
+
 @Deprecated("Use mock() with optional arguments instead.", ReplaceWith("mock<T>(defaultAnswer = a)"), level = WARNING)
 inline fun <reified T : Any> mock(a: Answer<Any>): T = mock(defaultAnswer = a)