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object SelectsActions {
    fun logout() {
        onView(allOf(withId(R.id.login_button), withText(R.string.logout))).perform(click())
    }

    fun login() {
        onView(allOf(withId(R.id.login_button), withText(R.string.login))).perform(click())
    }
}

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infix fun User.selects(block: SelectsActions.() -> Unit): User {
    block.invoke(SelectsActions)
    return this
}

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user selects { login() }

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infix fun Any.given(block: () -> Unit) = block.invoke()

infix fun Any.whenever(block: () -> Unit) = block.invoke()

infix fun Any.then(block: () -> Unit) = block.invoke()

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@Test
fun logsInWhenUserSelectsLogin() {
    given {
        user has { loggedOut() }
    } whenever {
        user launches {
            app()
        } selects {
            login()
        }

edwardharks

/*
 * Copyright 2017 Shazam Entertainment Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
 */

edwardharks

class SomeCustomView : View(...) {

    private val picasso by viewDependency { picasso() }
    
    fun bindData(imageUrl: String) {
        picasso.load(imageUrl).into(...)
    }
}

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class SomeCustomView : View(...) {

    private val picasso by viewDependency { picasso() }

    ...
    
}

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class SomeCustomView @JvmOverloads constructor(context: Context,
                                               attrs: AttributeSet? = null,
                                               defStyleAttr: Int = 0)
    : View(context, attrs, defStyleAttr) {

    private val picasso by viewDependency { picasso() }

}

edwardharks

fun <T> View.viewDependency(initializer: () -> T): ViewDependency<T> =
        if (isInEditMode) {
            EditModeViewDependency(this, initializer)
        } else {
            ImmediateViewDependency(initializer)
        }