test_search.py

"""
Test PostgreSQL full text search.

These tests use dialogue from the 1975 film Monty Python and the Holy Grail.
All text copyright Python (Monty) Pictures. Thanks to sacred-texts.com for the
transcript.
"""
from django.db.models import F, Value

from . import PostgreSQLSimpleTestCase, PostgreSQLTestCase
from .models import Character, Line, LineSavedSearch, Scene

try:
    from django.contrib.postgres.search import (
        SearchConfig,
        SearchHeadline,
        SearchQuery,
        SearchRank,
        SearchVector,
    )
except ImportError:
    pass


class GrailTestData:
    @classmethod
    def setUpTestData(cls):
        cls.robin = Scene.objects.create(
            scene="Scene 10", setting="The dark forest of Ewing"
        )
        cls.minstrel = Character.objects.create(name="Minstrel")
        verses = [
            (
                "Bravely bold Sir Robin, rode forth from Camelot. "
                "He was not afraid to die, o Brave Sir Robin. "
                "He was not at all afraid to be killed in nasty ways. "
                "Brave, brave, brave, brave Sir Robin"
            ),
            (
                "He was not in the least bit scared to be mashed into a pulp, "
                "Or to have his eyes gouged out, and his elbows broken. "
                "To have his kneecaps split, and his body burned away, "
                "And his limbs all hacked and mangled, brave Sir Robin!"
            ),
            (
                "His head smashed in and his heart cut out, "
                "And his liver removed and his bowels unplugged, "
                "And his nostrils ripped and his bottom burned off,"
                "And his --"
            ),
        ]
        cls.verses = [
            Line.objects.create(
                scene=cls.robin,
                character=cls.minstrel,
                dialogue=verse,
            )
            for verse in verses
        ]
        cls.verse0, cls.verse1, cls.verse2 = cls.verses

        cls.witch_scene = Scene.objects.create(
            scene="Scene 5", setting="Sir Bedemir's Castle"
        )
        bedemir = Character.objects.create(name="Bedemir")
        crowd = Character.objects.create(name="Crowd")
        witch = Character.objects.create(name="Witch")
        duck = Character.objects.create(name="Duck")

        cls.bedemir0 = Line.objects.create(
            scene=cls.witch_scene,
            character=bedemir,
            dialogue="We shall use my larger scales!",
            dialogue_config="english",
        )
        cls.bedemir1 = Line.objects.create(
            scene=cls.witch_scene,
            character=bedemir,
            dialogue="Right, remove the supports!",
            dialogue_config="english",
        )
        cls.duck = Line.objects.create(
            scene=cls.witch_scene, character=duck, dialogue=None
        )
        cls.crowd = Line.objects.create(
            scene=cls.witch_scene, character=crowd, dialogue="A witch! A witch!"
        )
        cls.witch = Line.objects.create(
            scene=cls.witch_scene, character=witch, dialogue="It's a fair cop."
        )

        trojan_rabbit = Scene.objects.create(
            scene="Scene 8", setting="The castle of Our Master Ruiz' de lu la Ramper"
        )
        guards = Character.objects.create(name="French Guards")
        cls.french = Line.objects.create(
            scene=trojan_rabbit,
            character=guards,
            dialogue="Oh. Un beau cadeau. Oui oui.",
            dialogue_config="french",
        )


class SimpleSearchTest(GrailTestData, PostgreSQLTestCase):
    def test_simple(self):
        searched = Line.objects.filter(dialogue__search="elbows")
        self.assertSequenceEqual(searched, [self.verse1])

    def test_non_exact_match(self):
        self.check_default_text_search_config()
        searched = Line.objects.filter(dialogue__search="hearts")
        self.assertSequenceEqual(searched, [self.verse2])

    def test_search_two_terms(self):
        self.check_default_text_search_config()
        searched = Line.objects.filter(dialogue__search="heart bowel")
        self.assertSequenceEqual(searched, [self.verse2])

    def test_search_two_terms_with_partial_match(self):
        searched = Line.objects.filter(dialogue__search="Robin killed")
        self.assertSequenceEqual(searched, [self.verse0])

    def test_search_query_config(self):
        searched = Line.objects.filter(
            dialogue__search=SearchQuery("nostrils", config="simple"),
        )
        self.assertSequenceEqual(searched, [self.verse2])

    def test_search_with_F_expression(self):
        # Non-matching query.
        LineSavedSearch.objects.create(line=self.verse1, query="hearts")
        # Matching query.
        match = LineSavedSearch.objects.create(line=self.verse1, query="elbows")
        for query_expression in [F("query"), SearchQuery(F("query"))]:
            with self.subTest(query_expression):
                searched = LineSavedSearch.objects.filter(
                    line__dialogue__search=query_expression,
                )
                self.assertSequenceEqual(searched, [match])


class SearchVectorFieldTest(GrailTestData, PostgreSQLTestCase):
    def test_existing_vector(self):
        Line.objects.update(dialogue_search_vector=SearchVector("dialogue"))
        searched = Line.objects.filter(
            dialogue_search_vector=SearchQuery("Robin killed")
        )
        self.assertSequenceEqual(searched, [self.verse0])

    def test_existing_vector_config_explicit(self):
        Line.objects.update(dialogue_search_vector=SearchVector("dialogue"))
        searched = Line.objects.filter(
            dialogue_search_vector=SearchQuery("cadeaux", config="french")
        )
        self.assertSequenceEqual(searched, [self.french])

    def test_single_coalesce_expression(self):
        searched = Line.objects.annotate(search=SearchVector("dialogue")).filter(
            search="cadeaux"
        )
        self.assertNotIn("COALESCE(COALESCE", str(searched.query))

    def test_values_with_percent(self):
        searched = Line.objects.annotate(
            search=SearchVector(Value("This week everything is 10% off"))
        ).filter(search="10 % off")
        self.assertEqual(len(searched), 9)


class SearchConfigTests(PostgreSQLSimpleTestCase):
    def test_from_parameter(self):
        self.assertIsNone(SearchConfig.from_parameter(None))
        self.assertEqual(SearchConfig.from_parameter("foo"), SearchConfig("foo"))
        self.assertEqual(
            SearchConfig.from_parameter(SearchConfig("bar")), SearchConfig("bar")
        )


class MultipleFieldsTest(GrailTestData, PostgreSQLTestCase):
    def test_simple_on_dialogue(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search="elbows")
        self.assertSequenceEqual(searched, [self.verse1])

    def test_simple_on_scene(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search="Forest")
        self.assertCountEqual(searched, self.verses)

    def test_non_exact_match(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search="heart")
        self.assertSequenceEqual(searched, [self.verse2])

    def test_search_two_terms(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search="heart forest")
        self.assertSequenceEqual(searched, [self.verse2])

    def test_terms_adjacent(self):
        searched = Line.objects.annotate(
            search=SearchVector("character__name", "dialogue"),
        ).filter(search="minstrel")
        self.assertCountEqual(searched, self.verses)
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search="minstrelbravely")
        self.assertSequenceEqual(searched, [])

    def test_search_with_null(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search="bedemir")
        self.assertCountEqual(
            searched, [self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck]
        )

    def test_search_with_non_text(self):
        searched = Line.objects.annotate(
            search=SearchVector("id"),
        ).filter(search=str(self.crowd.id))
        self.assertSequenceEqual(searched, [self.crowd])

    def test_phrase_search(self):
        line_qs = Line.objects.annotate(search=SearchVector("dialogue"))
        searched = line_qs.filter(
            search=SearchQuery("burned body his away", search_type="phrase")
        )
        self.assertSequenceEqual(searched, [])
        searched = line_qs.filter(
            search=SearchQuery("his body burned away", search_type="phrase")
        )
        self.assertSequenceEqual(searched, [self.verse1])

    def test_phrase_search_with_config(self):
        line_qs = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue", config="french"),
        )
        searched = line_qs.filter(
            search=SearchQuery("cadeau beau un", search_type="phrase", config="french"),
        )
        self.assertSequenceEqual(searched, [])
        searched = line_qs.filter(
            search=SearchQuery("un beau cadeau", search_type="phrase", config="french"),
        )
        self.assertSequenceEqual(searched, [self.french])

    def test_raw_search(self):
        line_qs = Line.objects.annotate(search=SearchVector("dialogue"))
        searched = line_qs.filter(search=SearchQuery("Robin", search_type="raw"))
        self.assertCountEqual(searched, [self.verse0, self.verse1])
        searched = line_qs.filter(
            search=SearchQuery("Robin & !'Camelot'", search_type="raw")
        )
        self.assertSequenceEqual(searched, [self.verse1])

    def test_raw_search_with_config(self):
        line_qs = Line.objects.annotate(
            search=SearchVector("dialogue", config="french")
        )
        searched = line_qs.filter(
            search=SearchQuery(
                "'cadeaux' & 'beaux'", search_type="raw", config="french"
            ),
        )
        self.assertSequenceEqual(searched, [self.french])

    def test_web_search(self):
        line_qs = Line.objects.annotate(search=SearchVector("dialogue"))
        searched = line_qs.filter(
            search=SearchQuery(
                '"burned body" "split kneecaps"',
                search_type="websearch",
            ),
        )
        self.assertSequenceEqual(searched, [])
        searched = line_qs.filter(
            search=SearchQuery(
                '"body burned" "kneecaps split" -"nostrils"',
                search_type="websearch",
            ),
        )
        self.assertSequenceEqual(searched, [self.verse1])
        searched = line_qs.filter(
            search=SearchQuery(
                '"Sir Robin" ("kneecaps" OR "Camelot")',
                search_type="websearch",
            ),
        )
        self.assertSequenceEqual(searched, [self.verse0, self.verse1])

    def test_web_search_with_config(self):
        line_qs = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue", config="french"),
        )
        searched = line_qs.filter(
            search=SearchQuery(
                "cadeau -beau", search_type="websearch", config="french"
            ),
        )
        self.assertSequenceEqual(searched, [])
        searched = line_qs.filter(
            search=SearchQuery("beau cadeau", search_type="websearch", config="french"),
        )
        self.assertSequenceEqual(searched, [self.french])

    def test_bad_search_type(self):
        with self.assertRaisesMessage(
            ValueError, "Unknown search_type argument 'foo'."
        ):
            SearchQuery("kneecaps", search_type="foo")

    def test_config_query_explicit(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue", config="french"),
        ).filter(search=SearchQuery("cadeaux", config="french"))
        self.assertSequenceEqual(searched, [self.french])

    def test_config_query_implicit(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue", config="french"),
        ).filter(search="cadeaux")
        self.assertSequenceEqual(searched, [self.french])

    def test_config_from_field_explicit(self):
        searched = Line.objects.annotate(
            search=SearchVector(
                "scene__setting", "dialogue", config=F("dialogue_config")
            ),
        ).filter(search=SearchQuery("cadeaux", config=F("dialogue_config")))
        self.assertSequenceEqual(searched, [self.french])

    def test_config_from_field_implicit(self):
        searched = Line.objects.annotate(
            search=SearchVector(
                "scene__setting", "dialogue", config=F("dialogue_config")
            ),
        ).filter(search="cadeaux")
        self.assertSequenceEqual(searched, [self.french])


class TestCombinations(GrailTestData, PostgreSQLTestCase):
    def test_vector_add(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting") + SearchVector("character__name"),
        ).filter(search="bedemir")
        self.assertCountEqual(
            searched, [self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck]
        )

    def test_vector_add_multi(self):
        searched = Line.objects.annotate(
            search=(
                SearchVector("scene__setting")
                + SearchVector("character__name")
                + SearchVector("dialogue")
            ),
        ).filter(search="bedemir")
        self.assertCountEqual(
            searched, [self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck]
        )

    def test_vector_combined_mismatch(self):
        msg = (
            "SearchVector can only be combined with other SearchVector "
            "instances, got NoneType."
        )
        with self.assertRaisesMessage(TypeError, msg):
            Line.objects.filter(dialogue__search=None + SearchVector("character__name"))

    def test_combine_different_vector_configs(self):
        self.check_default_text_search_config()
        searched = Line.objects.annotate(
            search=(
                SearchVector("dialogue", config="english")
                + SearchVector("dialogue", config="french")
            ),
        ).filter(
            search=SearchQuery("cadeaux", config="french") | SearchQuery("nostrils")
        )
        self.assertCountEqual(searched, [self.french, self.verse2])

    def test_query_and(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(search=SearchQuery("bedemir") & SearchQuery("scales"))
        self.assertSequenceEqual(searched, [self.bedemir0])

    def test_query_multiple_and(self):
        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(
            search=SearchQuery("bedemir")
            & SearchQuery("scales")
            & SearchQuery("nostrils")
        )
        self.assertSequenceEqual(searched, [])

        searched = Line.objects.annotate(
            search=SearchVector("scene__setting", "dialogue"),
        ).filter(
            search=SearchQuery("shall") & SearchQuery("use") & SearchQuery("larger")
        )
        self.assertSequenceEqual(searched, [self.bedemir0])

    def test_query_or(self):
        searched = Line.objects.filter(
            dialogue__search=SearchQuery("kneecaps") | SearchQuery("nostrils")
        )
        self.assertCountEqual(searched, [self.verse1, self.verse2])

    def test_query_multiple_or(self):
        searched = Line.objects.filter(
            dialogue__search=SearchQuery("kneecaps")
            | SearchQuery("nostrils")
            | SearchQuery("Sir Robin")
        )
        self.assertCountEqual(searched, [self.verse1, self.verse2, self.verse0])

    def test_query_invert(self):
        searched = Line.objects.filter(
            character=self.minstrel, dialogue__search=~SearchQuery("kneecaps")
        )
        self.assertCountEqual(searched, [self.verse0, self.verse2])

    def test_combine_different_configs(self):
        searched = Line.objects.filter(
            dialogue__search=(
                SearchQuery("cadeau", config="french")
                | SearchQuery("nostrils", config="english")
            )
        )
        self.assertCountEqual(searched, [self.french, self.verse2])

    def test_combined_configs(self):
        searched = Line.objects.filter(
            dialogue__search=(
                SearchQuery("nostrils", config="simple")
                & SearchQuery("bowels", config="simple")
            ),
        )
        self.assertSequenceEqual(searched, [self.verse2])

    def test_combine_raw_phrase(self):
        self.check_default_text_search_config()
        searched = Line.objects.filter(
            dialogue__search=(
                SearchQuery("burn:*", search_type="raw", config="simple")
                | SearchQuery("rode forth from Camelot", search_type="phrase")
            )
        )
        self.assertCountEqual(searched, [self.verse0, self.verse1, self.verse2])

    def test_query_combined_mismatch(self):
        msg = (
            "SearchQuery can only be combined with other SearchQuery "
            "instances, got NoneType."
        )
        with self.assertRaisesMessage(TypeError, msg):
            Line.objects.filter(dialogue__search=None | SearchQuery("kneecaps"))

        with self.assertRaisesMessage(TypeError, msg):
            Line.objects.filter(dialogue__search=None & SearchQuery("kneecaps"))


class TestRankingAndWeights(GrailTestData, PostgreSQLTestCase):
    def test_ranking(self):
        searched = (
            Line.objects.filter(character=self.minstrel)
            .annotate(
                rank=SearchRank(
                    SearchVector("dialogue"), SearchQuery("brave sir robin")
                ),
            )
            .order_by("rank")
        )
        self.assertSequenceEqual(searched, [self.verse2, self.verse1, self.verse0])

    def test_rank_passing_untyped_args(self):
        searched = (
            Line.objects.filter(character=self.minstrel)
            .annotate(
                rank=SearchRank("dialogue", "brave sir robin"),
            )
            .order_by("rank")
        )
        self.assertSequenceEqual(searched, [self.verse2, self.verse1, self.verse0])

    def test_weights_in_vector(self):
        vector = SearchVector("dialogue", weight="A") + SearchVector(
            "character__name", weight="D"
        )
        searched = (
            Line.objects.filter(scene=self.witch_scene)
            .annotate(
                rank=SearchRank(vector, SearchQuery("witch")),
            )
            .order_by("-rank")[:2]
        )
        self.assertSequenceEqual(searched, [self.crowd, self.witch])

        vector = SearchVector("dialogue", weight="D") + SearchVector(
            "character__name", weight="A"
        )
        searched = (
            Line.objects.filter(scene=self.witch_scene)
            .annotate(
                rank=SearchRank(vector, SearchQuery("witch")),
            )
            .order_by("-rank")[:2]
        )
        self.assertSequenceEqual(searched, [self.witch, self.crowd])

    def test_ranked_custom_weights(self):
        vector = SearchVector("dialogue", weight="D") + SearchVector(
            "character__name", weight="A"
        )
        weights = [1.0, 0.0, 0.0, 0.5]
        searched = (
            Line.objects.filter(scene=self.witch_scene)
            .annotate(
                rank=SearchRank(vector, SearchQuery("witch"), weights=weights),
            )
            .order_by("-rank")[:2]
        )
        self.assertSequenceEqual(searched, [self.crowd, self.witch])

    def test_ranking_chaining(self):
        searched = (
            Line.objects.filter(character=self.minstrel)
            .annotate(
                rank=SearchRank(
                    SearchVector("dialogue"), SearchQuery("brave sir robin")
                ),
            )
            .filter(rank__gt=0.3)
        )
        self.assertSequenceEqual(searched, [self.verse0])

    def test_cover_density_ranking(self):
        not_dense_verse = Line.objects.create(
            scene=self.robin,
            character=self.minstrel,
            dialogue=(
                "Bravely taking to his feet, he beat a very brave retreat. "
                "A brave retreat brave Sir Robin."
            ),
        )
        searched = (
            Line.objects.filter(character=self.minstrel)
            .annotate(
                rank=SearchRank(
                    SearchVector("dialogue"),
                    SearchQuery("brave robin"),
                    cover_density=True,
                ),
            )
            .order_by("rank", "-pk")
        )
        self.assertSequenceEqual(
            searched,
            [self.verse2, not_dense_verse, self.verse1, self.verse0],
        )

    def test_ranking_with_normalization(self):
        short_verse = Line.objects.create(
            scene=self.robin,
            character=self.minstrel,
            dialogue="A brave retreat brave Sir Robin.",
        )
        searched = (
            Line.objects.filter(character=self.minstrel)
            .annotate(
                rank=SearchRank(
                    SearchVector("dialogue"),
                    SearchQuery("brave sir robin"),
                    # Divide the rank by the document length.
                    normalization=2,
                ),
            )
            .order_by("rank")
        )
        self.assertSequenceEqual(
            searched,
            [self.verse2, self.verse1, self.verse0, short_verse],
        )

    def test_ranking_with_masked_normalization(self):
        short_verse = Line.objects.create(
            scene=self.robin,
            character=self.minstrel,
            dialogue="A brave retreat brave Sir Robin.",
        )
        searched = (
            Line.objects.filter(character=self.minstrel)
            .annotate(
                rank=SearchRank(
                    SearchVector("dialogue"),
                    SearchQuery("brave sir robin"),
                    # Divide the rank by the document length and by the number of
                    # unique words in document.
                    normalization=Value(2).bitor(Value(8)),
                ),
            )
            .order_by("rank")
        )
        self.assertSequenceEqual(
            searched,
            [self.verse2, self.verse1, self.verse0, short_verse],
        )


class SearchQueryTests(PostgreSQLSimpleTestCase):
    def test_str(self):
        tests = (
            (~SearchQuery("a"), "~SearchQuery(Value('a'))"),
            (
                (SearchQuery("a") | SearchQuery("b"))
                & (SearchQuery("c") | SearchQuery("d")),
                "((SearchQuery(Value('a')) || SearchQuery(Value('b'))) && "
                "(SearchQuery(Value('c')) || SearchQuery(Value('d'))))",
            ),
            (
                SearchQuery("a") & (SearchQuery("b") | SearchQuery("c")),
                "(SearchQuery(Value('a')) && (SearchQuery(Value('b')) || "
                "SearchQuery(Value('c'))))",
            ),
            (
                (SearchQuery("a") | SearchQuery("b")) & SearchQuery("c"),
                "((SearchQuery(Value('a')) || SearchQuery(Value('b'))) && "
                "SearchQuery(Value('c')))",
            ),
            (
                SearchQuery("a")
                & (SearchQuery("b") & (SearchQuery("c") | SearchQuery("d"))),
                "(SearchQuery(Value('a')) && (SearchQuery(Value('b')) && "
                "(SearchQuery(Value('c')) || SearchQuery(Value('d')))))",
            ),
        )
        for query, expected_str in tests:
            with self.subTest(query=query):
                self.assertEqual(str(query), expected_str)


class SearchHeadlineTests(GrailTestData, PostgreSQLTestCase):
    def test_headline(self):
        self.check_default_text_search_config()
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                F("dialogue"),
                SearchQuery("brave sir robin"),
                config=SearchConfig("english"),
            ),
        ).get(pk=self.verse0.pk)
        self.assertEqual(
            searched.headline,
            "<b>Robin</b>. He was not at all afraid to be killed in nasty "
            "ways. <b>Brave</b>, <b>brave</b>, <b>brave</b>, <b>brave</b> "
            "<b>Sir</b> <b>Robin</b>",
        )

    def test_headline_untyped_args(self):
        self.check_default_text_search_config()
        searched = Line.objects.annotate(
            headline=SearchHeadline("dialogue", "killed", config="english"),
        ).get(pk=self.verse0.pk)
        self.assertEqual(
            searched.headline,
            "Robin. He was not at all afraid to be <b>killed</b> in nasty "
            "ways. Brave, brave, brave, brave Sir Robin",
        )

    def test_headline_with_config(self):
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                "dialogue",
                SearchQuery("cadeaux", config="french"),
                config="french",
            ),
        ).get(pk=self.french.pk)
        self.assertEqual(
            searched.headline,
            "Oh. Un beau <b>cadeau</b>. Oui oui.",
        )

    def test_headline_with_config_from_field(self):
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                "dialogue",
                SearchQuery("cadeaux", config=F("dialogue_config")),
                config=F("dialogue_config"),
            ),
        ).get(pk=self.french.pk)
        self.assertEqual(
            searched.headline,
            "Oh. Un beau <b>cadeau</b>. Oui oui.",
        )

    def test_headline_separator_options(self):
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                "dialogue",
                "brave sir robin",
                start_sel="<span>",
                stop_sel="</span>",
            ),
        ).get(pk=self.verse0.pk)
        self.assertEqual(
            searched.headline,
            "<span>Robin</span>. He was not at all afraid to be killed in "
            "nasty ways. <span>Brave</span>, <span>brave</span>, <span>brave"
            "</span>, <span>brave</span> <span>Sir</span> <span>Robin</span>",
        )

    def test_headline_highlight_all_option(self):
        self.check_default_text_search_config()
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                "dialogue",
                SearchQuery("brave sir robin", config="english"),
                highlight_all=True,
            ),
        ).get(pk=self.verse0.pk)
        self.assertIn(
            "<b>Bravely</b> bold <b>Sir</b> <b>Robin</b>, rode forth from "
            "Camelot. He was not afraid to die, o ",
            searched.headline,
        )

    def test_headline_short_word_option(self):
        self.check_default_text_search_config()
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                "dialogue",
                SearchQuery("Camelot", config="english"),
                short_word=5,
                min_words=8,
            ),
        ).get(pk=self.verse0.pk)
        self.assertEqual(
            searched.headline,
            (
                "<b>Camelot</b>. He was not afraid to die, o Brave Sir Robin. He "
                "was not at all afraid"
            ),
        )

    def test_headline_fragments_words_options(self):
        self.check_default_text_search_config()
        searched = Line.objects.annotate(
            headline=SearchHeadline(
                "dialogue",
                SearchQuery("brave sir robin", config="english"),
                fragment_delimiter="...<br>",
                max_fragments=4,
                max_words=3,
                min_words=1,
            ),
        ).get(pk=self.verse0.pk)
        self.assertEqual(
            searched.headline,
            "<b>Sir</b> <b>Robin</b>, rode...<br>"
            "<b>Brave</b> <b>Sir</b> <b>Robin</b>...<br>"
            "<b>Brave</b>, <b>brave</b>, <b>brave</b>...<br>"
            "<b>brave</b> <b>Sir</b> <b>Robin</b>",
        )