package com.peachpasswords.autofill

import org.junit.Assert.assertEquals
import org.junit.Assert.assertTrue
import org.junit.Test

/**
 * Regression pin for the 2026-08-07 Fold 7 crash loop: Facebook Messenger
 * presented an autofillHints array containing a null entry and classify()
 * dereferenced it, crashing the autofill service on every fill request
 * (One UI then surfaces the repeated "app keeps stopping" dialog). Hint
 * arrays are third-party input and must never crash the parser.
 */
class AssistStructureNullHintsTest {

    @Test fun null_hint_entries_are_dropped() {
        assertEquals(
            listOf("password", "username"),
            AssistStructureParser.nonNullHints(arrayOf(null, "password", null, "username")),
        )
    }

    @Test fun all_null_array_is_empty() {
        assertTrue(AssistStructureParser.nonNullHints(arrayOf<String?>(null, null)).isEmpty())
    }

    @Test fun absent_hints_is_empty() {
        assertTrue(AssistStructureParser.nonNullHints(null).isEmpty())
    }
}