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Using Mockito with Kotlin.
There is a newer version: 5.4.0
/*
 * 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 org.mockito.BDDMockito
import org.mockito.BDDMockito.BDDMyOngoingStubbing
import org.mockito.invocation.InvocationOnMock
import org.mockito.kotlin.internal.SuspendableAnswer
import org.mockito.stubbing.Answer
import kotlin.reflect.KClass

/**
 * Alias for [BDDMockito.given].
 */
fun  given(methodCall: T): BDDMockito.BDDMyOngoingStubbing {
    return BDDMockito.given(methodCall)
}

/**
 * Alias for [BDDMockito.given] with a lambda.
 */
fun  given(methodCall: () -> T): BDDMyOngoingStubbing {
    return given(methodCall())
}

/**
 * Alias for [BDDMockito.then].
 */
fun  then(mock: T): BDDMockito.Then {
    return BDDMockito.then(mock)
}

/**
 * Alias for [BDDMyOngoingStubbing.will]
 * */
infix fun  BDDMyOngoingStubbing.will(value: Answer): BDDMockito.BDDMyOngoingStubbing {
    return will(value)
}

/**
 * Alias for [BBDMyOngoingStubbing.willAnswer], accepting a lambda.
 */
infix fun  BDDMyOngoingStubbing.willAnswer(value: (InvocationOnMock) -> T?): BDDMockito.BDDMyOngoingStubbing {
    return willAnswer { value(it) }
}

/**
 * Alias for [BBDMyOngoingStubbing.willAnswer], accepting a suspend lambda.
 */
infix fun  BDDMyOngoingStubbing.willSuspendableAnswer(value: suspend (InvocationOnMock) -> T?): BDDMockito.BDDMyOngoingStubbing {
    return willAnswer(SuspendableAnswer(value))
}

/**
 * Alias for [BBDMyOngoingStubbing.willReturn].
 */
infix fun  BDDMyOngoingStubbing.willReturn(value: () -> T): BDDMockito.BDDMyOngoingStubbing {
    return willReturn(value())
}

/**
 * Alias for [BBDMyOngoingStubbing.willThrow].
 */
infix fun  BDDMyOngoingStubbing.willThrow(value: () -> Throwable): BDDMockito.BDDMyOngoingStubbing {
    return willThrow(value())
}

/**
 * Sets a Throwable type to be thrown when the method is called.
 *
 * Alias for [BDDMyOngoingStubbing.willThrow]
 */
infix fun  BDDMyOngoingStubbing.willThrow(t: KClass): BDDMyOngoingStubbing {
    return willThrow(t.java)
}

/**
 * Sets Throwable classes to be thrown when the method is called.
 *
 * Alias for [BDDMyOngoingStubbing.willThrow]
 */
fun  BDDMyOngoingStubbing.willThrow(
    t: KClass,
    vararg ts: KClass
): BDDMyOngoingStubbing {
    return willThrow(t.java, *ts.map { it.java }.toTypedArray())
}

/**
 * Sets consecutive return values to be returned when the method is called.
 * Same as [BDDMyOngoingStubbing.willReturn], but accepts list instead of varargs.
 */
inline infix fun  BDDMyOngoingStubbing.willReturnConsecutively(ts: List): BDDMyOngoingStubbing {
    return willReturn(
          ts[0],
          *ts.drop(1).toTypedArray()
    )
}