val list = mock<MutableList<String>>()

list.add("String 1")
list.add("String 2")

list.verify {
    times(2).add(any())
}

val list = MutableList::class.mock {
    on { size }.thenReturn(5)
    on { this[eq(3)] }.thenReturn("String 4")
}
assertEquals(5, list.size)
assertEquals("String 4", list[3])

val list = ArrayList<String>().spy()
val set = spy<HashSet>() {
    ...
}

// Mocking
val mockService = mock<ServiceClass>()
// Test
mockService.foo()
mockService.bar(SomeData("Test", 1))
// Verification
mockService.verifyOnce { match ->
    foo()
    bar(match.eq(SomeData("Test", 1)))
}

mock<Foo> {
    defaults.register<Bar>(someBarValue)
    ...
}

Defaults.Global.register<Bar>(someBarValue)

    <repositories>
        <repository>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            <id>bintray-paslavsky-maven</id>
            <name>bintray</name>
            <url>https://dl.bintray.com/paslavsky/maven</url>
        </repository>
    </repositories>

    <dependency>
        <groupId>net.paslavsky.kotlin</groupId>
        <artifactId>mockito-kt</artifactId>
        <version>2.0.1</version>
        <scope>test</scope>
    </dependency>

repositories {
    maven {
        url  "https://dl.bintray.com/paslavsky/maven" 
    }
}

dependencies {
    testCompile 'net.paslavsky.kotlin:mockito-kt:2.0.1'
}