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sczerwinski/AndroidMatchers.kt

Created June 15, 2017 19:31
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Kotlin functions creating custom Hamcrest matchers for Android
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AndroidMatchers.kt
import android.view.View
import org.hamcrest.Description
import org.hamcrest.Matcher
import org.hamcrest.TypeSafeMatcher
inline fun <reified T : View> withType(): Matcher<View> = object : TypeSafeMatcher<View>() {
override fun describeTo(description: Description?) {
description?.appendText("with type: ${T::class.java.name}")
}
override fun matchesSafely(item: View?): Boolean =
item.let { it is T }
}
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Usage:

onView(withType<Button>())

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