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Using Mockito with Kotlin.
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/*
 * The MIT License
 *
 * Copyright (c) 2018 Niek Haarman
 * Copyright (c) 2007 Mockito contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.mockito.kotlin

import kotlinx.coroutines.runBlocking
import org.mockito.Mockito
import org.mockito.invocation.InvocationOnMock
import org.mockito.stubbing.Stubber
import kotlin.reflect.KClass

fun  doAnswer(answer: (InvocationOnMock) -> T?): Stubber {
    return Mockito.doAnswer { answer(it) }!!
}

fun doCallRealMethod(): Stubber {
    return Mockito.doCallRealMethod()!!
}

fun doNothing(): Stubber {
    return Mockito.doNothing()!!
}

fun doReturn(value: Any?): Stubber {
    return Mockito.doReturn(value)!!
}

fun doReturn(toBeReturned: Any?, vararg toBeReturnedNext: Any?): Stubber {
    return Mockito.doReturn(
          toBeReturned,
          *toBeReturnedNext
    )!!
}

fun doThrow(toBeThrown: KClass): Stubber {
    return Mockito.doThrow(toBeThrown.java)!!
}

fun doThrow(vararg toBeThrown: Throwable): Stubber {
    return Mockito.doThrow(*toBeThrown)!!
}

fun  Stubber.whenever(mock: T) = `when`(mock)

/**
 * Alias for when with suspending function
 *
 * Warning: Only one method call can be stubbed in the function.
 * Subsequent method calls are ignored!
 */
fun  Stubber.wheneverBlocking(mock: T, f: suspend T.() -> Unit) {
    val m = whenever(mock)
    runBlocking { m.f() }
}