espresso_set_checkbox.kt

//This method will work on a checkbox. It will set the state of checkbox either checked or unchecked
private fun setChecked(checked: Boolean): ViewAction {
        return object : ViewAction {
            override fun getDescription(): String? {
                return null
            }

            override fun getConstraints(): Matcher<View> {
                return object : BaseMatcher<View>() {
                    override fun matches(item: Any): Boolean {
                        return isA(Checkable::class.java).matches(item)
                    }

                    override fun describeMismatch(item: Any, mismatchDescription: Description) {}

                    override fun describeTo(description: Description) {}
                }
            }

            override
            fun perform(uiController: UiController, view: View) {
                val checkableView = view as Checkable
                checkableView.isChecked = checked
            }
        }
    }

//Call it like this
onView(withId(R.id.addressCheckbox)).perform(setChecked(false)) //It will uncheck the box