# encoding: utf-8

"""Unit-test suite for `pptx.slide` module."""

import pytest

from pptx.dml.fill import FillFormat
from pptx.enum.shapes import PP_PLACEHOLDER
from pptx.package import Package
from pptx.parts.presentation import PresentationPart
from pptx.parts.slide import SlideLayoutPart, SlideMasterPart, SlidePart
from pptx.presentation import Presentation
from pptx.shapes.base import BaseShape
from pptx.shapes.placeholder import LayoutPlaceholder, NotesSlidePlaceholder
from pptx.shapes.shapetree import (
    LayoutPlaceholders,
    LayoutShapes,
    MasterPlaceholders,
    MasterShapes,
    NotesSlidePlaceholders,
    NotesSlideShapes,
    SlidePlaceholders,
    SlideShapes,
)
from pptx.slide import (
    _Background,
    _BaseMaster,
    _BaseSlide,
    NotesMaster,
    NotesSlide,
    Slide,
    SlideLayout,
    SlideLayouts,
    SlideMaster,
    SlideMasters,
    Slides,
)
from pptx.text.text import TextFrame

from .unitutil.cxml import element, xml
from .unitutil.mock import call, class_mock, instance_mock, method_mock, property_mock


class Describe_BaseSlide(object):
    """Unit-test suite for `pptx.slide._BaseSlide` objects."""

    def it_knows_its_name(self, name_get_fixture):
        base_slide, expected_value = name_get_fixture
        assert base_slide.name == expected_value

    def it_can_change_its_name(self, name_set_fixture):
        base_slide, new_value, expected_xml = name_set_fixture
        base_slide.name = new_value
        assert base_slide._element.xml == expected_xml

    def it_provides_access_to_its_background(self, background_fixture):
        slide, _Background_, cSld, background_ = background_fixture

        background = slide.background

        _Background_.assert_called_once_with(cSld)
        assert background is background_

    # fixtures -------------------------------------------------------

    @pytest.fixture
    def background_fixture(self, _Background_, background_):
        sld = element("p:sld/p:cSld")
        slide = _BaseSlide(sld, None)
        cSld = sld.xpath("//p:cSld")[0]
        _Background_.return_value = background_
        return slide, _Background_, cSld, background_

    @pytest.fixture(
        params=[("p:sld/p:cSld", ""), ("p:sld/p:cSld{name=Foobar}", "Foobar")]
    )
    def name_get_fixture(self, request):
        sld_cxml, expected_name = request.param
        base_slide = _BaseSlide(element(sld_cxml), None)
        return base_slide, expected_name

    @pytest.fixture(
        params=[
            ("p:sld/p:cSld", "foo", "p:sld/p:cSld{name=foo}"),
            ("p:sld/p:cSld{name=foo}", "bar", "p:sld/p:cSld{name=bar}"),
            ("p:sld/p:cSld{name=bar}", "", "p:sld/p:cSld"),
            ("p:sld/p:cSld{name=bar}", None, "p:sld/p:cSld"),
            ("p:sld/p:cSld", "", "p:sld/p:cSld"),
            ("p:sld/p:cSld", None, "p:sld/p:cSld"),
        ]
    )
    def name_set_fixture(self, request):
        xSld_cxml, new_value, expected_cxml = request.param
        base_slide = _BaseSlide(element(xSld_cxml), None)
        expected_xml = xml(expected_cxml)
        return base_slide, new_value, expected_xml

    # fixture components ---------------------------------------------

    @pytest.fixture
    def _Background_(self, request):
        return class_mock(request, "pptx.slide._Background")

    @pytest.fixture
    def background_(self, request):
        return instance_mock(request, _Background)


class Describe_BaseMaster(object):
    """Unit-test suite for `pptx.slide._BaseMaster` objects."""

    def it_is_a_BaseSlide_subclass(self, subclass_fixture):
        base_master = subclass_fixture
        assert isinstance(base_master, _BaseSlide)

    def it_provides_access_to_its_placeholders(self, placeholders_fixture):
        base_master, MasterPlaceholders_, spTree, placeholders_ = placeholders_fixture
        placeholders = base_master.placeholders
        MasterPlaceholders_.assert_called_once_with(spTree, base_master)
        assert placeholders is placeholders_

    def it_provides_access_to_its_shapes(self, shapes_fixture):
        base_master, MasterShapes_, spTree, shapes_ = shapes_fixture
        shapes = base_master.shapes
        MasterShapes_.assert_called_once_with(spTree, base_master)
        assert shapes is shapes_

    # fixtures -------------------------------------------------------

    @pytest.fixture
    def placeholders_fixture(self, MasterPlaceholders_, placeholders_):
        master_element = element("p:sldMaster/p:cSld/p:spTree")
        base_master = _BaseMaster(master_element, None)
        spTree = master_element.xpath("//p:spTree")[0]
        return base_master, MasterPlaceholders_, spTree, placeholders_

    @pytest.fixture
    def shapes_fixture(self, MasterShapes_, shapes_):
        master_element = element("p:sldMaster/p:cSld/p:spTree")
        base_master = _BaseMaster(master_element, None)
        spTree = master_element.xpath("//p:spTree")[0]
        return base_master, MasterShapes_, spTree, shapes_

    @pytest.fixture
    def subclass_fixture(self):
        return _BaseMaster(None, None)

    # fixture components -----------------------------------

    @pytest.fixture
    def MasterPlaceholders_(self, request, placeholders_):
        return class_mock(
            request, "pptx.slide.MasterPlaceholders", return_value=placeholders_
        )

    @pytest.fixture
    def MasterShapes_(self, request, shapes_):
        return class_mock(request, "pptx.slide.MasterShapes", return_value=shapes_)

    @pytest.fixture
    def placeholders_(self, request):
        return instance_mock(request, MasterPlaceholders)

    @pytest.fixture
    def shapes_(self, request):
        return instance_mock(request, MasterShapes)


class DescribeNotesSlide(object):
    """Unit-test suite for `pptx.slide.NotesSlide` objects."""

    def it_can_clone_the_notes_master_placeholders(
        self, request, notes_master_, shapes_
    ):
        placeholders = notes_master_.placeholders = (
            BaseShape(element("p:sp/p:nvSpPr/p:nvPr/p:ph{type=body}"), None),
            BaseShape(element("p:sp/p:nvSpPr/p:nvPr/p:ph{type=dt}"), None),
        )
        property_mock(request, NotesSlide, "shapes", return_value=shapes_)
        notes_slide = NotesSlide(None, None)

        notes_slide.clone_master_placeholders(notes_master_)

        assert shapes_.clone_placeholder.call_args_list == [call(placeholders[0])]

    def it_provides_access_to_its_shapes(self, shapes_fixture):
        notes_slide, NotesSlideShapes_, spTree, shapes_ = shapes_fixture
        shapes = notes_slide.shapes
        NotesSlideShapes_.assert_called_once_with(spTree, notes_slide)
        assert shapes is shapes_

    def it_provides_access_to_its_placeholders(self, placeholders_fixture):
        (
            notes_slide,
            NotesSlidePlaceholders_,
            spTree,
            placeholders_,
        ) = placeholders_fixture
        placeholders = notes_slide.placeholders
        NotesSlidePlaceholders_.assert_called_once_with(spTree, notes_slide)
        assert placeholders is placeholders_

    def it_provides_access_to_its_notes_placeholder(self, notes_ph_fixture):
        notes_slide, expected_value = notes_ph_fixture
        placeholder = notes_slide.notes_placeholder
        assert placeholder is expected_value

    def it_provides_access_to_its_notes_text_frame(self, notes_tf_fixture):
        notes_slide, expected_value = notes_tf_fixture
        text_frame = notes_slide.notes_text_frame
        assert text_frame is expected_value

    # fixtures -------------------------------------------------------

    @pytest.fixture(
        params=[
            (("SLIDE_IMAGE", "BODY", "SLIDE_NUMBER"), 1),
            (("DATE", "SLIDE_IMAGE", "FOOTER"), None),
        ]
    )
    def notes_ph_fixture(self, request, placeholders_prop_):
        type_names, match = request.param
        notes_slide = NotesSlide(None, None)
        placeholders_ = []
        for type_name in type_names:
            placeholder_ = instance_mock(
                request, NotesSlidePlaceholder, name="%s-placeholder" % type_name
            )
            placeholder_.placeholder_format.type = getattr(PP_PLACEHOLDER, type_name)
            placeholders_.append(placeholder_)
        placeholders_prop_.return_value = placeholders_
        expected_value = None if match is None else placeholders_[match]
        return notes_slide, expected_value

    @pytest.fixture(params=[True, False])
    def notes_tf_fixture(
        self, request, notes_placeholder_prop_, placeholder_, text_frame_
    ):
        has_text_frame = request.param
        notes_slide = NotesSlide(None, None)
        if has_text_frame:
            notes_placeholder_prop_.return_value = placeholder_
            placeholder_.text_frame = text_frame_
            expected_value = text_frame_
        else:
            notes_placeholder_prop_.return_value = None
            expected_value = None
        return notes_slide, expected_value

    @pytest.fixture
    def placeholders_fixture(self, NotesSlidePlaceholders_, placeholders_):
        notes = element("p:notes/p:cSld/p:spTree")
        notes_slide = NotesSlide(notes, None)
        spTree = notes.xpath("//p:spTree")[0]
        return notes_slide, NotesSlidePlaceholders_, spTree, placeholders_

    @pytest.fixture
    def shapes_fixture(self, NotesSlideShapes_, shapes_):
        notes = element("p:notes/p:cSld/p:spTree")
        notes_slide = NotesSlide(notes, None)
        spTree = notes.xpath("//p:spTree")[0]
        return notes_slide, NotesSlideShapes_, spTree, shapes_

    # fixture components ---------------------------------------------

    @pytest.fixture
    def notes_master_(self, request):
        return instance_mock(request, NotesMaster)

    @pytest.fixture
    def notes_placeholder_prop_(self, request, placeholder_):
        return property_mock(
            request, NotesSlide, "notes_placeholder", return_value=placeholder_
        )

    @pytest.fixture
    def NotesSlidePlaceholders_(self, request, placeholders_):
        return class_mock(
            request, "pptx.slide.NotesSlidePlaceholders", return_value=placeholders_
        )

    @pytest.fixture
    def NotesSlideShapes_(self, request, shapes_):
        return class_mock(request, "pptx.slide.NotesSlideShapes", return_value=shapes_)

    @pytest.fixture
    def placeholder_(self, request):
        return instance_mock(request, NotesSlidePlaceholder)

    @pytest.fixture
    def placeholders_(self, request):
        return instance_mock(request, NotesSlidePlaceholders)

    @pytest.fixture
    def placeholders_prop_(self, request, placeholders_):
        return property_mock(
            request, NotesSlide, "placeholders", return_value=placeholders_
        )

    @pytest.fixture
    def shapes_(self, request):
        return instance_mock(request, NotesSlideShapes)

    @pytest.fixture
    def text_frame_(self, request):
        return instance_mock(request, TextFrame)


class DescribeSlide(object):
    """Unit-test suite for `pptx.slide.Slide` objects."""

    def it_is_a_BaseSlide_subclass(self, subclass_fixture):
        slide = subclass_fixture
        assert isinstance(slide, _BaseSlide)

    def it_provides_access_to_its_background(self, background_fixture):
        slide, _BaseSlide_background_, background_ = background_fixture

        background = slide.background

        _BaseSlide_background_.assert_called_once_with()
        assert background is background_

    def it_knows_whether_it_follows_the_mstr_bkgd(self, follow_get_fixture):
        slide, expected_value = follow_get_fixture
        follows = slide.follow_master_background
        assert follows is expected_value

    def it_knows_whether_it_has_a_notes_slide(self, has_notes_slide_fixture):
        slide, expected_value = has_notes_slide_fixture
        assert slide.has_notes_slide is expected_value

    def it_knows_its_slide_id(self, slide_id_fixture):
        slide, expected_value = slide_id_fixture
        assert slide.slide_id == expected_value

    def it_provides_access_to_its_shapes(self, shapes_fixture):
        slide, SlideShapes_, spTree, shapes_ = shapes_fixture
        shapes = slide.shapes
        SlideShapes_.assert_called_once_with(spTree, slide)
        assert shapes is shapes_

    def it_provides_access_to_its_placeholders(self, placeholders_fixture):
        slide, SlidePlaceholders_, spTree, placeholders_ = placeholders_fixture
        placeholders = slide.placeholders
        SlidePlaceholders_.assert_called_once_with(spTree, slide)
        assert placeholders is placeholders_

    def it_provides_access_to_its_slide_layout(self, layout_fixture):
        slide, slide_layout_ = layout_fixture
        assert slide.slide_layout is slide_layout_

    def it_provides_access_to_its_notes_slide(self, notes_slide_fixture):
        slide, notes_slide_ = notes_slide_fixture
        assert slide.notes_slide is notes_slide_

    # fixtures -------------------------------------------------------

    @pytest.fixture
    def background_fixture(self, _BaseSlide_background_, background_):
        slide = Slide(None, None)
        _BaseSlide_background_.return_value = background_
        return slide, _BaseSlide_background_, background_

    @pytest.fixture(params=[("p:sld/p:cSld", True), ("p:sld/p:cSld/p:bg", False)])
    def follow_get_fixture(self, request):
        pSld_cxml, expected_value = request.param
        slide = Slide(element(pSld_cxml), None)
        return slide, expected_value

    @pytest.fixture
    def has_notes_slide_fixture(self, part_prop_, slide_part_):
        slide = Slide(None, None)
        expected_value = slide_part_.has_notes_slide = 42
        return slide, expected_value

    @pytest.fixture
    def layout_fixture(self, slide_layout_, part_prop_, slide_part_):
        slide = Slide(None, None)
        part_prop_.return_value = slide_part_
        slide_part_.slide_layout = slide_layout_
        return slide, slide_layout_

    @pytest.fixture
    def notes_slide_fixture(self, notes_slide_, part_prop_, slide_part_):
        slide = Slide(None, None)
        slide_part_.notes_slide = notes_slide_
        return slide, notes_slide_

    @pytest.fixture
    def placeholders_fixture(self, SlidePlaceholders_, placeholders_):
        sld = element("p:sld/p:cSld/p:spTree")
        slide = Slide(sld, None)
        spTree = sld.xpath("//p:spTree")[0]
        return slide, SlidePlaceholders_, spTree, placeholders_

    @pytest.fixture
    def shapes_fixture(self, SlideShapes_, shapes_):
        sld = element("p:sld/p:cSld/p:spTree")
        spTree = sld.xpath("//p:spTree")[0]
        slide = Slide(sld, None)
        return slide, SlideShapes_, spTree, shapes_

    @pytest.fixture
    def slide_id_fixture(self, part_prop_, slide_part_):
        slide = Slide(None, None)
        slide_id = 256
        slide_part_.slide_id = slide_id
        return slide, slide_id

    @pytest.fixture
    def subclass_fixture(self):
        return Slide(None, None)

    # fixture components ---------------------------------------------

    @pytest.fixture
    def _BaseSlide_background_(self, request):
        return property_mock(request, _BaseSlide, "background")

    @pytest.fixture
    def background_(self, request):
        return instance_mock(request, _Background)

    @pytest.fixture
    def notes_slide_(self, request):
        return instance_mock(request, NotesSlide)

    @pytest.fixture
    def part_prop_(self, request, slide_part_):
        return property_mock(request, Slide, "part", return_value=slide_part_)

    @pytest.fixture
    def placeholders_(self, request):
        return instance_mock(request, SlidePlaceholders)

    @pytest.fixture
    def SlidePlaceholders_(self, request, placeholders_):
        return class_mock(
            request, "pptx.slide.SlidePlaceholders", return_value=placeholders_
        )

    @pytest.fixture
    def SlideShapes_(self, request, shapes_):
        return class_mock(request, "pptx.slide.SlideShapes", return_value=shapes_)

    @pytest.fixture
    def shapes_(self, request):
        return instance_mock(request, SlideShapes)

    @pytest.fixture
    def slide_layout_(self, request):
        return instance_mock(request, SlideLayout)

    @pytest.fixture
    def slide_part_(self, request):
        return instance_mock(request, SlidePart)


class DescribeSlides(object):
    """Unit-test suite for `pptx.slide.Slides` objects."""

    def it_supports_indexed_access(self, getitem_fixture):
        slides, prs_part_, rId, slide_ = getitem_fixture
        slide = slides[0]
        prs_part_.related_slide.assert_called_once_with(rId)
        assert slide is slide_

    def it_raises_on_slide_index_out_of_range(self, getitem_raises_fixture):
        slides = getitem_raises_fixture
        with pytest.raises(IndexError):
            slides[2]

    def it_knows_the_index_of_a_slide_it_contains(self, index_fixture):
        slides, slide, expected_value = index_fixture
        index = slides.index(slide)
        assert index == expected_value

    def it_raises_on_slide_not_in_collection(self, raises_fixture):
        slides, slide = raises_fixture
        with pytest.raises(ValueError):
            slides.index(slide)

    def it_can_iterate_its_slides(self, iter_fixture):
        slides, related_slide_, calls, expected_value = iter_fixture
        slide_lst = [s for s in slides]
        assert related_slide_.call_args_list == calls
        assert slide_lst == expected_value

    def it_supports_len(self, len_fixture):
        slides, expected_value = len_fixture
        assert len(slides) == expected_value

    def it_can_add_a_new_slide(self, add_fixture):
        slides, slide_layout_, part_ = add_fixture[:3]
        clone_layout_placeholders_, expected_xml, slide_ = add_fixture[3:]

        slide = slides.add_slide(slide_layout_)

        part_.add_slide.assert_called_once_with(slide_layout_)
        clone_layout_placeholders_.assert_called_once_with(slide_layout_)
        assert slides._sldIdLst.xml == expected_xml
        assert slide is slide_

    def it_finds_a_slide_by_slide_id(self, get_fixture):
        slides, slide_id, default, prs_part_, expected_value = get_fixture
        slide = slides.get(slide_id, default)
        prs_part_.get_slide.assert_called_once_with(slide_id)
        assert slide is expected_value

    # fixtures -------------------------------------------------------

    @pytest.fixture
    def add_fixture(self, slide_layout_, part_prop_, slide_):
        slides = Slides(element("p:sldIdLst/p:sldId{r:id=rId1}"), None)
        part_ = part_prop_.return_value
        clone_layout_placeholders_ = slide_.shapes.clone_layout_placeholders
        expected_xml = xml("p:sldIdLst/(p:sldId{r:id=rId1},p:sldId{r:id=rId2,id=256})")
        part_.add_slide.return_value = "rId2", slide_
        return (
            slides,
            slide_layout_,
            part_,
            clone_layout_placeholders_,
            expected_xml,
            slide_,
        )

    @pytest.fixture(params=[True, False])
    def get_fixture(self, request, part_prop_, prs_part_, slide_):
        found = request.param
        slides = Slides(None, None)
        slide_id, default = 256, "foobar"
        expected_value = slide_ if found else default
        prs_part_.get_slide.return_value = slide_ if found else None
        return slides, slide_id, default, prs_part_, expected_value

    @pytest.fixture
    def getitem_fixture(self, prs_part_, slide_, part_prop_):
        sldIdLst = element("p:sldIdLst/p:sldId{r:id=rId1}")
        slides = Slides(sldIdLst, None)
        prs_part_.related_slide.return_value = slide_
        return slides, prs_part_, "rId1", slide_

    @pytest.fixture
    def getitem_raises_fixture(self):
        sldIdLst = element("p:sldIdLst/p:sldId{r:id=rId1}")
        slides = Slides(sldIdLst, None)
        return slides

    @pytest.fixture(params=[0, 1])
    def index_fixture(self, request, part_prop_):
        idx = request.param
        sldIdLst = element("p:sldIdLst/(p:sldId{r:id=a},p:sldId{r:id=b})")
        slides = Slides(sldIdLst, None)
        _slides = [Slide(element("p:sld"), None), Slide(element("p:sld"), None)]
        part_prop_.return_value.related_slide.side_effect = _slides
        return slides, _slides[idx], idx

    @pytest.fixture
    def iter_fixture(self, part_prop_, slide_):
        sldIdLst = element("p:sldIdLst/(p:sldId{r:id=a},p:sldId{r:id=b})")
        slides = Slides(sldIdLst, None)
        related_slide_ = part_prop_.return_value.related_slide
        related_slide_.return_value = slide_
        calls = [call("a"), call("b")]
        _slides = [slide_, slide_]
        return slides, related_slide_, calls, _slides

    @pytest.fixture(
        params=[
            ("p:sldIdLst", 0),
            ("p:sldIdLst/p:sldId{r:id=a}", 1),
            ("p:sldIdLst/(p:sldId{r:id=a},p:sldId{r:id=b})", 2),
        ]
    )
    def len_fixture(self, request):
        sldIdLst_cxml, expected_value = request.param
        slides = Slides(element(sldIdLst_cxml), None)
        return slides, expected_value

    @pytest.fixture
    def raises_fixture(self):
        slides = Slides(element("p:sldIdLst"), None)
        slide = Slide(element("p:sld"), None)
        return slides, slide

    # fixture components ---------------------------------------------

    @pytest.fixture
    def part_prop_(self, request, prs_part_):
        return property_mock(request, Slides, "part", return_value=prs_part_)

    @pytest.fixture
    def prs_part_(self, request):
        return instance_mock(request, PresentationPart)

    @pytest.fixture
    def slide_(self, request):
        return instance_mock(request, Slide)

    @pytest.fixture
    def slide_layout_(self, request):
        return instance_mock(request, SlideLayout)


class DescribeSlideLayout(object):
    """Unit-test suite for `pptx.slide.SlideLayout` objects."""

    def it_is_a_BaseSlide_subclass(self):
        slide_layout = SlideLayout(None, None)
        assert isinstance(slide_layout, _BaseSlide)

    def it_can_iterate_its_clonable_placeholders(self, cloneable_fixture):
        slide_layout, expected_placeholders = cloneable_fixture
        cloneable = list(slide_layout.iter_cloneable_placeholders())
        assert cloneable == expected_placeholders

    def it_provides_access_to_its_placeholders(
        self, LayoutPlaceholders_, placeholders_
    ):
        sldLayout = element("p:sldLayout/p:cSld/p:spTree")
        spTree = sldLayout.xpath("//p:spTree")[0]
        slide_layout = SlideLayout(sldLayout, None)

        placeholders = slide_layout.placeholders

        LayoutPlaceholders_.assert_called_once_with(spTree, slide_layout)
        assert placeholders is placeholders_

    def it_provides_access_to_its_shapes(self, LayoutShapes_, shapes_):
        sldLayout = element("p:sldLayout/p:cSld/p:spTree")
        spTree = sldLayout.xpath("//p:spTree")[0]
        slide_layout = SlideLayout(sldLayout, None)

        shapes = slide_layout.shapes

        LayoutShapes_.assert_called_once_with(spTree, slide_layout)
        assert shapes is shapes_

    def it_provides_access_to_its_slide_master(self, slide_master_, part_prop_):
        part_prop_.return_value.slide_master = slide_master_
        slide_layout = SlideLayout(None, None)

        slide_master = slide_layout.slide_master

        assert slide_master is slide_master_

    def it_knows_which_slides_are_based_on_it(
        self,
        used_by_fixture,
        part_prop_,
        slide_layout_part_,
        package_,
        presentation_part_,
        presentation_,
    ):
        presentation_, slide_layout, expected_value = used_by_fixture
        part_prop_.return_value = slide_layout_part_
        slide_layout_part_.package = package_
        package_.presentation_part = presentation_part_
        presentation_part_.presentation = presentation_

        used_by_slides = slide_layout.used_by_slides

        assert used_by_slides == expected_value

    # fixtures -------------------------------------------------------

    @pytest.fixture(
        params=[
            ((PP_PLACEHOLDER.TITLE, PP_PLACEHOLDER.BODY), (0, 1)),
            ((PP_PLACEHOLDER.TITLE, PP_PLACEHOLDER.DATE), (0,)),
            ((PP_PLACEHOLDER.FOOTER, PP_PLACEHOLDER.OBJECT), (1,)),
            ((PP_PLACEHOLDER.SLIDE_NUMBER, PP_PLACEHOLDER.FOOTER), ()),
        ]
    )
    def cloneable_fixture(
        self, request, placeholders_prop_, placeholder_, placeholder_2_
    ):
        ph_types, expected_indices = request.param
        slide_layout = SlideLayout(None, None)
        placeholder_.element.ph_type = ph_types[0]
        placeholder_2_.element.ph_type = ph_types[1]
        _placeholders = (placeholder_, placeholder_2_)
        expected_placeholders = [_placeholders[idx] for idx in expected_indices]
        placeholders_prop_.return_value = _placeholders
        return slide_layout, expected_placeholders

    @pytest.fixture(params=[(), (0,), (1,), (0, 1)])
    def used_by_fixture(self, request, presentation_, slide_, slide_2_):
        used_by_idxs = request.param
        slides = (slide_, slide_2_)
        slide_layout = SlideLayout(None, None)
        for idx, s in enumerate(slides):
            s.slide_layout = slide_layout if idx in used_by_idxs else None
        presentation_.slides = slides
        expected_value = tuple(s for i, s in enumerate(slides) if i in used_by_idxs)
        return presentation_, slide_layout, expected_value

    # fixture components -----------------------------------

    @pytest.fixture
    def LayoutPlaceholders_(self, request, placeholders_):
        return class_mock(
            request, "pptx.slide.LayoutPlaceholders", return_value=placeholders_
        )

    @pytest.fixture
    def LayoutShapes_(self, request, shapes_):
        return class_mock(request, "pptx.slide.LayoutShapes", return_value=shapes_)

    @pytest.fixture
    def package_(self, request):
        return instance_mock(request, Package)

    @pytest.fixture
    def part_prop_(self, request, slide_layout_part_):
        return property_mock(
            request, SlideLayout, "part", return_value=slide_layout_part_
        )

    @pytest.fixture
    def placeholder_(self, request):
        return instance_mock(request, LayoutPlaceholder)

    @pytest.fixture
    def placeholder_2_(self, request):
        return instance_mock(request, LayoutPlaceholder)

    @pytest.fixture
    def placeholders_(self, request):
        return instance_mock(request, LayoutPlaceholders)

    @pytest.fixture
    def placeholders_prop_(self, request, placeholders_):
        return property_mock(
            request, SlideLayout, "placeholders", return_value=placeholders_
        )

    @pytest.fixture
    def presentation_(self, request):
        return instance_mock(request, Presentation)

    @pytest.fixture
    def presentation_part_(self, request):
        return instance_mock(request, PresentationPart)

    @pytest.fixture
    def shapes_(self, request):
        return instance_mock(request, LayoutShapes)

    @pytest.fixture
    def slide_(self, request):
        return instance_mock(request, Slide)

    @pytest.fixture
    def slide_2_(self, request):
        return instance_mock(request, Slide)

    @pytest.fixture
    def slide_layout_part_(self, request):
        return instance_mock(request, SlideLayoutPart)

    @pytest.fixture
    def slide_master_(self, request):
        return instance_mock(request, SlideMaster)


class DescribeSlideLayouts(object):
    """Unit-test suite for `pptx.slide.SlideLayouts` objects."""

    def it_supports_len(self, len_fixture):
        slide_layouts, expected_value = len_fixture
        assert len(slide_layouts) == expected_value

    def it_can_iterate_its_slide_layouts(self, part_prop_, slide_master_part_):
        sldLayoutIdLst = element(
            "p:sldLayoutIdLst/(p:sldLayoutId{r:id=a},p:sldLayoutId{r:id=b})"
        )
        _slide_layouts = [
            SlideLayout(element("p:sldLayout"), None),
            SlideLayout(element("p:sldLayout"), None),
        ]
        part_prop_.return_value = slide_master_part_
        related_slide_layout_ = slide_master_part_.related_slide_layout
        related_slide_layout_.side_effect = _slide_layouts
        slide_layouts = SlideLayouts(sldLayoutIdLst, None)

        slide_layout_lst = [sl for sl in slide_layouts]

        assert related_slide_layout_.call_args_list == [call("a"), call("b")]
        assert slide_layout_lst == _slide_layouts

    def it_supports_indexed_access(self, slide_layout_, part_prop_, slide_master_part_):
        part_prop_.return_value = slide_master_part_
        slide_master_part_.related_slide_layout.return_value = slide_layout_
        slide_layouts = SlideLayouts(
            element("p:sldLayoutIdLst/p:sldLayoutId{r:id=rId1}"), None
        )

        slide_layout = slide_layouts[0]

        slide_master_part_.related_slide_layout.assert_called_once_with("rId1")
        assert slide_layout is slide_layout_

    def but_it_raises_on_index_out_of_range(self, part_prop_):
        slide_layouts = SlideLayouts(
            element("p:sldLayoutIdLst/p:sldLayoutId{r:id=rId1}"), None
        )
        with pytest.raises(IndexError):
            slide_layouts[1]

    def it_can_find_a_slide_layout_by_name(