Why android espresso test fails when checking whether textView text ends with expected string (when ellipsized)

Question

I have an android test checking that external text message is truncated and ends with three dots when applying android:ellipsize=\"end\". I do not know why test fails despite te

Answer 1

To check if the text of a TextView has been ellipsized you can create your custom matcher like this one:

fun ellipsized() = object : TypeSafeMatcher() {
    override fun describeTo(description: Description) {
        description.appendText("with ellipsized text")
    }

    override fun matchesSafely(v: View): Boolean {
        if (!(v is TextView)) {
            return false
        }
        val textView: TextView = v
        val layout: Layout = textView.getLayout()
        val lines = layout.lineCount
        if (lines > 0) {
            val ellipsisCount = layout.getEllipsisCount(lines - 1)
            if (ellipsisCount > 0) {
                return true
            }
        }

        return false
    }
}

And call it this way:

onView(withId(R.id.errorMessageTextView))
    .check(matches(ellipsized()))