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fanstatic-dummy / fanstatic / test_core.py

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from __future__ import with_statement
import os
import re
import pytest
import time

from fanstatic import (Library,
                       Resource,
                       NeededResources,
                       Group,
                       init_needed,
                       del_needed,
                       get_needed,
                       clear_needed,
                       register_inclusion_renderer,
                       ConfigurationError,
                       bundle_resources,
                       LibraryDependencyCycleError,
                       NEEDED,
                       UnknownResourceExtensionError,
                       UnknownResourceError,
                       set_resource_file_existence_checking)

from fanstatic.core import inclusion_renderers
from fanstatic.core import thread_local_needed_data
from fanstatic.core import ModeResourceDependencyError
from fanstatic.codegen import sort_resources_topological

def test_resource():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(y1)

    assert needed.resources() == [x2, x1, y1]

def test_resource_file_exists(tmpdir):
    tmpdir.join('a.js').write('/* hello world */')
    # by default this is set to False during the tests, but in normal
    # non-test circumstances this is set to True, and we want to
    # test things for real here
    set_resource_file_existence_checking(True)
    foo = Library('foo', tmpdir.strpath)
    # since a.js exists, this should work
    a = Resource(foo, 'a.js')
    # now we try to create a resource that refers to a file
    # that doesn't exist
    with pytest.raises(UnknownResourceError):
        b = Resource(foo, 'b.js')

    sub_c = tmpdir.mkdir('sub').join('c.css').write('c')
    c = Resource(foo, 'sub/c.css')

def test_resource_register_with_library():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js', minified='a.min.js')

    assert len(foo.known_resources) == 2
    assert x1 in foo.known_resources.values()

    # Can not use the same relpath for two Resource declarations.
    with pytest.raises(ConfigurationError):
        x2 = Resource(foo, 'a.js')


def test_group_resource():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    group = Group([x1, x2])

    needed = NeededResources()
    needed.need(group)

    assert group.resources == set([x1, x2])

    more_stuff = Resource(foo, 'more_stuff.js', depends=[group])
    assert more_stuff.resources == set([x1, x2, more_stuff])


def test_convenience_need_not_initialized():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    dummy = get_needed()
    assert not isinstance(dummy, NeededResources)

    # We return a new dummy instance for every get_needed:
    dummy2 = get_needed()
    assert dummy != dummy2

    # A dummy never has resources:
    assert not dummy.has_resources()

    dummy.need(y1)
    with pytest.raises(NotImplementedError):
        dummy.render()


def test_convenience_clear_not_initialized():
    # This test is put near the top of this module, or at least before
    # the very first time ``init_needed()`` is called.
    dummy = get_needed()
    with pytest.raises(NotImplementedError):
        dummy.clear()
    with pytest.raises(NotImplementedError):
        clear_needed()

    # Initialize a needed resources object.
    needed = init_needed()
    assert get_needed() == needed
    assert thread_local_needed_data.__dict__[NEEDED] == needed

    # Clear it.
    del_needed()

    # It is gone, really.
    with pytest.raises(KeyError):
        thread_local_needed_data.__dict__[NEEDED]

    # Clearing it again is OK.
    del_needed()

    # get_needed still work, dummy-style.
    dummy2 = get_needed()
    assert dummy2 != needed
    with pytest.raises(NotImplementedError):
        dummy.clear()
    with pytest.raises(NotImplementedError):
        clear_needed()

def test_convenience_need():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = init_needed()
    assert get_needed() == needed
    assert get_needed().resources() == []

    y1.need()

    assert get_needed().resources() == [x2, x1, y1]


def test_convenience_group_resource_need():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js')
    group = Group([x1, x2, y1])

    needed = init_needed()
    assert get_needed() == needed
    assert get_needed().resources() == []

    group.need()

    assert get_needed().resources() == [x2, x1, y1]

def test_depend_on_group():
    foo = Library('foo', '')
    a = Resource(foo, 'a.js')
    b = Resource(foo, 'b.js')
    g = Group([a, b])
    c = Resource(foo, 'c.js', depends=[g])
    g2 = Group([g])
    g3 = Group([g, g2])

    assert c.depends == set([a, b])
    assert g2.depends == set([a, b])
    assert g3.depends == set([a, b])

    needed = NeededResources()
    needed.need(c)
    assert needed.resources() == [a, b, c]

def test_redundant_resource():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()

    needed.need(y1)
    needed.need(y1)
    assert needed.resources() == [x2, x1, y1]

    needed.need(x1)
    assert needed.resources() == [x2, x1, y1]

    needed.need(x2)
    assert needed.resources() == [x2, x1, y1]


def test_redundant_resource_reorder():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(x1)
    needed.need(x2)
    needed.need(y1)
    assert needed.resources() == [x2, x1, y1]


def test_redundant_more_complicated():
    foo = Library('foo', '')
    a1 = Resource(foo, 'a1.js')
    a2 = Resource(foo, 'a2.js', depends=[a1])
    a3 = Resource(foo, 'a3.js', depends=[a2])
    a4 = Resource(foo, 'a4.js', depends=[a1])

    needed = NeededResources()
    needed.need(a3)

    assert needed.resources() == [a1, a2, a3]
    needed.need(a4)
    # a4 is sorted before a3, because it is less deep
    # in the dependency tree
    assert needed.resources() == [a1, a2, a4, a3]


def test_redundant_more_complicated_reversed():
    foo = Library('foo', '')
    a1 = Resource(foo, 'a1.js')
    a2 = Resource(foo, 'a2.js', depends=[a1])
    a3 = Resource(foo, 'a3.js', depends=[a2])
    a4 = Resource(foo, 'a4.js', depends=[a1])

    needed = NeededResources()
    needed.need(a4)
    needed.need(a3)
    # this will always be consistent, no matter
    # in what order we need the resources
    assert needed.resources() == [a1, a2, a4, a3]


def test_redundant_more_complicated_depends_on_all():
    foo = Library('foo', '')
    a1 = Resource(foo, 'a1.js')
    a2 = Resource(foo, 'a2.js', depends=[a1])
    a3 = Resource(foo, 'a3.js', depends=[a2])
    a4 = Resource(foo, 'a4.js', depends=[a1])
    a5 = Resource(foo, 'a5.js', depends=[a4, a3])

    needed = NeededResources()
    needed.need(a5)
    assert needed.resources() == [a1, a2, a4, a3, a5]


def test_redundant_more_complicated_depends_on_all_reorder():
    foo = Library('foo', '')
    a1 = Resource(foo, 'a1.js')
    a2 = Resource(foo, 'a2.js', depends=[a1])
    a3 = Resource(foo, 'a3.js', depends=[a2])
    a4 = Resource(foo, 'a4.js', depends=[a1])
    a5 = Resource(foo, 'a5.js', depends=[a4, a3])

    needed = NeededResources()
    needed.need(a3)
    needed.need(a5)

    assert needed.resources() == [a1, a2, a4, a3, a5]


def test_mode_fully_specified():
    foo = Library('foo', '')
    k_debug = Resource(foo, 'k-debug.js')
    k = Resource(foo, 'k.js', debug=k_debug)

    needed = NeededResources()
    needed.need(k)

    assert needed.resources() == [k]

    needed = NeededResources(debug=True)
    needed.need(k)

    assert needed.resources() == [k_debug]

    # If no minified can be found, the 'raw' resource is taken.
    needed = NeededResources(minified=True)
    needed.need(k)
    assert needed.resources() == [k]

    with pytest.raises(ConfigurationError):
        NeededResources(debug=True, minified=True)

    # If only a minified resource is defined, debug returns the raw version.
    x = Resource(foo, 'x.js', minified='x-min.js')
    needed = NeededResources(debug=True)
    needed.need(x)
    assert needed.resources() == [x]


def test_mode_shortcut():
    foo = Library('foo', '')
    k = Resource(foo, 'k.js', debug='k-debug.js')

    needed = NeededResources()
    needed.need(k)

    assert needed.resources() == [k]

    needed = NeededResources(debug=True)
    needed.need(k)

    assert len(needed.resources()) == 1
    assert needed.resources()[0].relpath == 'k-debug.js'


def test_mode_inherit_dependency_nr():
    foo = Library('foo', '')
    k = Resource(foo, 'k.js')
    l_debug = Resource(foo, 'l-debug.js')
    assert l_debug.dependency_nr == 0
    l = Resource(foo, 'l.js', debug=l_debug, depends=[k])
    assert l_debug.dependency_nr == 1


def test_rollup():
    foo = Library('foo', '')
    b1 = Resource(foo, 'b1.js')
    b2 = Resource(foo, 'b2.js')
    giant = Resource(foo, 'giant.js', supersedes=[b1, b2])

    needed = NeededResources(rollup=True)
    needed.need(b1)
    needed.need(b2)

    assert needed.resources() == [giant]


def test_rollup_cannot():
    foo = Library('foo', '')
    b1 = Resource(foo, 'b1.js')
    b2 = Resource(foo, 'b2.js')

    giant = Resource(foo, 'giant.js', supersedes=[b1, b2])

    needed = NeededResources(rollup=True)
    needed.need(b1)
    assert needed.resources() == [b1]
    assert giant not in needed.resources()


def test_rollup_larger():
    foo = Library('foo', '')
    c1 = Resource(foo, 'c1.css')
    c2 = Resource(foo, 'c2.css')
    c3 = Resource(foo, 'c3.css')
    giant = Resource(foo, 'giant.css', supersedes=[c1, c2, c3])

    needed = NeededResources(rollup=True)
    needed.need(c1)

    assert needed.resources() == [c1]

    needed.need(c2)

    assert needed.resources() == [c1, c2]

    needed.need(c3)

    assert needed.resources() == [giant]


def test_rollup_size_competing():
    foo = Library('foo', '')
    d1 = Resource(foo, 'd1.js')
    d2 = Resource(foo, 'd2.js')
    d3 = Resource(foo, 'd3.js')
    giant = Resource(foo, 'giant.js', supersedes=[d1, d2])
    giant_bigger = Resource(foo, 'giant-bigger.js',
                            supersedes=[d1, d2, d3])

    needed = NeededResources(rollup=True)
    needed.need(d1)
    needed.need(d2)
    needed.need(d3)
    assert needed.resources() == [giant_bigger]
    assert giant not in needed.resources()


def test_rollup_modes():
    foo = Library('foo', '')
    f1 = Resource(foo, 'f1.js', debug='f1-debug.js')
    f2 = Resource(foo, 'f2.js', debug='f2-debug.js')
    giantf = Resource(foo, 'giantf.js', supersedes=[f1, f2],
                      debug='giantf-debug.js')

    needed = NeededResources(rollup=True)
    needed.need(f1)
    needed.need(f2)
    assert needed.resources() == [giantf]

    needed = NeededResources(rollup=True, debug=True)
    needed.need(f1)
    needed.need(f2)
    assert needed.resources() == [giantf.modes['debug']]


def test_rollup_without_mode():
    foo = Library('foo', '')
    h1 = Resource(foo, 'h1.js', debug='h1-debug.js')
    h2 = Resource(foo, 'h2.js', debug='h2-debug.js')
    gianth = Resource(foo, 'gianth.js', supersedes=[h1, h2])

    needed = NeededResources(resources=[h1, h2], rollup=True, debug=True)
    # no mode available for rollup, use the rollup.
    assert needed.resources() == [gianth]


def test_rendering():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(y1)

    assert needed.render() == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''


def test_rendering_base_url():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(y1)
    assert needed.render() == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''

    needed = NeededResources(base_url='http://localhost/static')
    needed.need(y1)
    assert needed.render() == '''\
<link rel="stylesheet" type="text/css" href="http://localhost/static/fanstatic/foo/b.css" />
<script type="text/javascript" src="http://localhost/static/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="http://localhost/static/fanstatic/foo/c.js"></script>'''
    # The base_url has been set.
    assert needed.has_base_url()

    needed.set_base_url('foo')
    # The base_url can only be set once.
    assert needed._base_url == 'http://localhost/static'


def test_empty_base_url_and_publisher_signature():
    ''' When the base_url is not set and the publisher_signature is an empty string,
    render a URL without them. '''
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    needed = NeededResources(publisher_signature='')
    needed.need(x1)

    assert needed.render() == '''\
<script type="text/javascript" src="/foo/a.js"></script>'''


def test_rendering_base_url_assign():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(y1)
    needed.set_base_url('http://localhost/static')
    assert needed.render() == '''\
<link rel="stylesheet" type="text/css" href="http://localhost/static/fanstatic/foo/b.css" />
<script type="text/javascript" src="http://localhost/static/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="http://localhost/static/fanstatic/foo/c.js"></script>'''


def test_library_url_default_publisher_signature():
    foo = Library('foo', '')

    needed = NeededResources()

    assert needed.library_url(foo) == '/fanstatic/foo'


def test_library_url_publisher_signature():
    foo = Library('foo', '')

    needed = NeededResources(publisher_signature='waku')

    assert needed.library_url(foo) == '/waku/foo'


def test_library_url_base_url():
    foo = Library('foo', '')

    needed = NeededResources(base_url="http://example.com/something")

    assert (needed.library_url(foo) ==
            'http://example.com/something/fanstatic/foo')


def test_library_url_version_hashing(tmpdir):
    foo = Library('foo', tmpdir.strpath)

    needed = NeededResources(versioning=True)
    url = needed.library_url(foo)
    assert re.match('/fanstatic/foo/:version:[0-9T:.-]*$', url)

    # The md5 based version URL is available through the
    # `versioning_use_md5` parameter:
    needed = NeededResources(versioning=True, versioning_use_md5=True)
    md5_url = needed.library_url(foo)
    assert url != md5_url

    # If the Library defines a version, the version is used.
    bar = Library('bar', '', version='1')
    assert needed.library_url(bar) == '/fanstatic/bar/:version:1'


def test_library_url_hashing_norecompute(tmpdir):
    foo = Library('foo', tmpdir.strpath)

    needed = NeededResources(versioning=True, recompute_hashes=False)

    url = needed.library_url(foo)

    # now create a file
    resource = tmpdir.join('test.js')
    resource.write('/* test */')

    # since we're not re-computing hashes, the hash in the URL won't change
    assert needed.library_url(foo) == url


def test_library_url_hashing_recompute(tmpdir):
    foo = Library('foo', tmpdir.strpath)

    needed = NeededResources(versioning=True, recompute_hashes=True)

    url = needed.library_url(foo)

    # now create a file
    resource = tmpdir.join('test.js')

    time.sleep(0.02)
    # Sleep extra long on filesystems that report in seconds
    # instead of milliseconds.
    if os.path.getmtime(os.curdir).is_integer():
        time.sleep(1)
    resource.write('/* test */')

    # the hash is recalculated now, so it changes
    assert needed.library_url(foo) != url


def test_html_insert():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(y1)

    html = "<html><head>something more</head></html>"

    # XXX where is extraneous space coming from? misguided attempt at
    # indentation?
    assert needed.render_into_html(html) == '''\
<html><head>
    <link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>
something more</head></html>'''


def test_html_insert_head_with_attributes():
    # ticket 72: .need() broken when <head> tag has attributes
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    needed = NeededResources(resources=[x1])

    html = '<html><head profile="http://example.org">something</head></html>'
    assert needed.render_into_html(html) == '''\
<html><head profile="http://example.org">
    <script type="text/javascript" src="/fanstatic/foo/a.js"></script>
something</head></html>'''

def test_html_top_bottom():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources()
    needed.need(y1)

    top, bottom = needed.render_topbottom()
    assert top == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''
    assert bottom == ''


def test_html_top_bottom_set_bottom():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources(bottom=True)
    needed.need(y1)

    top, bottom = needed.render_topbottom()
    assert top == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''
    assert bottom == ''


def test_html_top_bottom_force_bottom():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    needed = NeededResources(bottom=True, force_bottom=True)
    needed.need(y1)

    top, bottom = needed.render_topbottom()
    assert top == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />'''
    assert bottom == '''\
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''


def test_html_bottom_safe():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])
    y2 = Resource(foo, 'y2.js', bottom=True)

    needed = NeededResources()
    needed.need(y1)
    needed.need(y2)
    top, bottom = needed.render_topbottom()
    assert top == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/y2.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''
    assert bottom == ''

    needed = NeededResources(bottom=True)
    needed.need(y1)
    needed.need(y2)
    top, bottom = needed.render_topbottom()
    assert top == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''
    assert bottom == '''\
<script type="text/javascript" src="/fanstatic/foo/y2.js"></script>'''

    needed = NeededResources(bottom=True, force_bottom=True)
    needed.need(y1)
    needed.need(y2)
    top, bottom = needed.render_topbottom()
    assert top == '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />'''
    assert bottom == '''\
<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/y2.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script>'''

# XXX add sanity checks: cannot declare something bottom safe while
# what it depends on isn't bottom safe

def test_html_bottom_safe_used_with_minified():
    foo = Library('foo', '')
    a = Resource(foo, 'a.js', minified='a-minified.js', bottom=True)
    
    needed = NeededResources(minified=True, bottom=True)
    needed.need(a)

    top, bottom = needed.render_topbottom()
    assert top == ''
    assert bottom == ('<script type="text/javascript" '
                      'src="/fanstatic/foo/a-minified.js"></script>')

def test_top_bottom_insert():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    html = "<html><head>rest of head</head><body>rest of body</body></html>"

    needed = NeededResources(bottom=True, force_bottom=True)
    needed.need(y1)
    assert needed.render_topbottom_into_html(html) == '''\
<html><head>
    <link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />
rest of head</head><body>rest of body<script type="text/javascript" src="/fanstatic/foo/a.js"></script>
<script type="text/javascript" src="/fanstatic/foo/c.js"></script></body></html>'''


def test_inclusion_renderers():
    assert sorted(
        [(order, key) for key, (order, _) in inclusion_renderers.items()]) == [
        (10, '.css'), (20, '.js'), (30, '.ico')]
    _, renderer = inclusion_renderers['.js']
    assert renderer('http://localhost/script.js') == (
         '<script type="text/javascript" src="http://localhost/script.js"></script>')


def test_register_inclusion_renderer():
    foo = Library('foo', '')

    with pytest.raises(UnknownResourceExtensionError):
        # The renderer for '.unknown' is not yet defined.
        Resource(foo, 'nothing.unknown')

    def render_unknown(url):
        return '<link rel="unknown" href="%s" />' % url

    register_inclusion_renderer('.unknown', render_unknown)
    a = Resource(foo, 'nothing.unknown')

    needed = NeededResources()
    needed.need(a)
    assert needed.render() == ('<link rel="unknown" href="/fanstatic/foo/nothing.unknown" />')


def test_registered_inclusion_renderers_in_order():
    foo = Library('foo', '')

    def render_unknown(url):
        return '<unknown href="%s"/>' % url

    register_inclusion_renderer('.later', render_unknown, 50)
    a = Resource(foo, 'nothing.later')
    b = Resource(foo, 'something.js')
    c = Resource(foo, 'something.css')
    d = Resource(foo, 'something.ico')

    needed = NeededResources()
    needed.need(a)
    needed.need(b)
    needed.need(c)
    needed.need(d)

    assert needed.render() == """\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/something.css" />
<script type="text/javascript" src="/fanstatic/foo/something.js"></script>
<link rel="shortcut icon" type="image/x-icon" href="/fanstatic/foo/something.ico"/>
<unknown href="/fanstatic/foo/nothing.later"/>"""

    register_inclusion_renderer('.sooner', render_unknown, 5)
    e = Resource(foo, 'nothing.sooner')
    needed.need(e)
    assert needed.render() == """\
<unknown href="/fanstatic/foo/nothing.sooner"/>
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/something.css" />
<script type="text/javascript" src="/fanstatic/foo/something.js"></script>
<link rel="shortcut icon" type="image/x-icon" href="/fanstatic/foo/something.ico"/>
<unknown href="/fanstatic/foo/nothing.later"/>"""

    register_inclusion_renderer('.between', render_unknown, 25)
    f = Resource(foo, 'nothing.between')
    needed.need(f)
    assert needed.render() == """\
<unknown href="/fanstatic/foo/nothing.sooner"/>
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/something.css" />
<script type="text/javascript" src="/fanstatic/foo/something.js"></script>
<unknown href="/fanstatic/foo/nothing.between"/>
<link rel="shortcut icon" type="image/x-icon" href="/fanstatic/foo/something.ico"/>
<unknown href="/fanstatic/foo/nothing.later"/>"""


def test_custom_renderer_for_resource():
    foo = Library('foo', '')

    def render_print_css(url):
        return ('<link rel="stylesheet" type="text/css" href="%s" media="print"/>' %
                url)

    a = Resource(foo, 'printstylesheet.css', renderer=render_print_css)
    needed = NeededResources()
    needed.need(a)
    assert needed.render() == """\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/printstylesheet.css" media="print"/>"""

    def render_unknown(url):
        return '<unknown href="%s"/>' % url

    b = Resource(foo, 'nothing.unknown', renderer=render_unknown)
    needed.need(b)
    assert needed.render() == """\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/printstylesheet.css" media="print"/>
<unknown href="/fanstatic/foo/nothing.unknown"/>"""


def test_custom_renderer_keep_together():
    foo = Library('foo', '')

    def render_print_css(url):
        return ('<link rel="stylesheet" type="text/css" href="%s" media="print"/>' %
                url)

    a = Resource(foo, 'printstylesheet.css', renderer=render_print_css)
    b = Resource(foo, 'regular.css')
    c = Resource(foo, 'something.js')

    needed = NeededResources()
    needed.need(a)
    needed.need(b)
    needed.need(c)

    assert needed.render() == """\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/printstylesheet.css" media="print"/>
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/regular.css" />
<script type="text/javascript" src="/fanstatic/foo/something.js"></script>"""


def test_resource_subclass_render():
    foo = Library('foo', '')

    class MyResource(Resource):
        def render(self, library_url):
            return '<myresource reference="%s/%s"/>' % (library_url, self.relpath)

    a = MyResource(foo, 'printstylesheet.css')
    needed = NeededResources()
    needed.need(a)
    assert needed.render() == """\
<myresource reference="/fanstatic/foo/printstylesheet.css"/>"""


def test_clear():
    foo = Library('foo', '')

    a1 = Resource(foo, 'a1.js')
    a2 = Resource(foo, 'a2.js', depends=[a1])
    a3 = Resource(foo, 'a3.js', depends=[a2])

    a4 = Resource(foo, 'a4.js', depends=[a1])
    a5 = Resource(foo, 'a5.js', depends=[a4, a3])

    needed = NeededResources()
    needed.need(a1)
    needed.need(a2)
    needed.need(a3)
    assert needed.resources() == [a1, a2, a3]
    # For some reason,for example an error page needs to be rendered,
    # the currently needed resources need to be cleared.
    needed.clear()
    assert needed.resources() == []
    needed.need(a4)
    needed.need(a5)
    assert needed.resources() == [a1, a2, a4, a3, a5]


def test_convenience_clear():
    foo = Library('foo', '')
    x1 = Resource(foo, 'a.js')
    x2 = Resource(foo, 'b.css')
    y1 = Resource(foo, 'c.js', depends=[x1, x2])

    z1 = Resource(foo, 'd.js')
    z2 = Resource(foo, 'e.js', depends=[z1, x1])

    needed = init_needed()

    y1.need()
    assert needed.resources() == [x2, x1, y1]
    # For some reason,for example an error page needs to be rendered,
    # the currently needed resources need to be cleared.
    clear_needed()
    assert needed.resources() == []
    z2.need()
    assert needed.resources() == [x1, z1, z2]


def test_check_resource_dependencies():
    foo = Library('foo', '')

    r1 = Resource(foo, 'r1.css')
    r2 = Resource(foo, 'r2.css')
    r3 = Resource(foo, 'r3.css', depends=[r1, r2])
    # https://bitbucket.org/fanstatic/fanstatic/issue/63
    # If a resource is a mode (debug, minified) of a resource, its
    # dependencies should be the same or a subset of the dependencies that
    # this mode replaces.
    with pytest.raises(ModeResourceDependencyError):
        Resource(foo, 'r4.css', depends=[r1], minified=r3)


def test_normalize_string():
    foo = Library('foo', '')
    r1 = Resource(foo, 'r1.css', minified='r1.min.css')
    assert isinstance(r1.modes['minified'], Resource)


def test_sort_group_per_renderer():
    foo = Library('foo', '')
    a_js = Resource(foo, 'a.js')
    b_css = Resource(foo, 'b.css')
    c_js = Resource(foo, 'c.js')
    a1_js = Resource(foo, 'a1.js', depends=[b_css])

    needed = NeededResources()
    needed.need(a_js)
    needed.need(b_css)
    needed.need(c_js)
    needed.need(a1_js)

    assert needed.resources() == [b_css, a_js, c_js, a1_js]

def test_sort_group_per_library():
    foo = Library('foo', '')
    bar = Library('bar', '')

    e = Resource(foo, 'e.js')
    d = Resource(foo, 'd.js', depends=[e])
    c = Resource(bar, 'c.js', depends=[e])
    b = Resource(bar, 'b.js')
    a = Resource(bar, 'a.js', depends=[c])

    needed = NeededResources()
    needed.need(a)
    needed.need(b)
    needed.need(c)
    needed.need(d)
    needed.need(e)

    assert needed.resources() == [e, d, b, c, a]

def test_sort_library_by_name():
    b_lib = Library('b_lib', '')
    a_lib = Library('a_lib', '')

    a_a = Resource(a_lib, 'a.js')
    a_b = Resource(b_lib, 'a.js')

    needed = NeededResources()
    needed.need(a_b)
    needed.need(a_a)

    assert needed.resources() == [a_a, a_b]

def test_sort_resources_libraries_together():
    K = Library('K', '')
    L = Library('L', '')
    M = Library('M', '')
    N = Library('N', '')

    k1 = Resource(K, 'k1.js')
    l1 = Resource(L, 'l1.js')
    m1 = Resource(M, 'm1.js', depends=[k1])
    m2 = Resource(M, 'm2.js', depends=[l1])
    n1 = Resource(N, 'n1.js', depends=[m1])

    needed = NeededResources()
    needed.need(m1)
    needed.need(m2)
    # sort_resources makes an efficient ordering, grouping m1 and m2 together
    # after their dependencies (they are in the same library)
    assert needed.resources() == [k1, l1, m1, m2]

    needed = NeededResources()
    needed.need(n1)
    needed.need(m2)
    # the order is unaffected by the ordering of inclusions
    assert needed.resources() == [k1, l1, m1, m2, n1]

def test_sort_resources_library_sorting():
    # a complicated example that makes sure libraries are sorted
    # correctly to obey ordering constraints but still groups them
    X = Library('X', '')
    Y = Library('Y', '')
    Z = Library('Z', '')

    a = Resource(X, 'a.js')
    b = Resource(Z, 'b.js', depends=[a])

    c = Resource(Y, 'c.js')
    c1 = Resource(Y, 'c1.js', depends=[c])
    c2 = Resource(Y, 'c2.js', depends=[c1])
    d = Resource(Z, 'd.js', depends=[c])
    e = Resource(Z, 'e.js')

    needed = NeededResources()
    needed.need(b)
    needed.need(c2)
    needed.need(d)
    needed.need(e)

    assert needed.resources() == [a, c, c1, c2, e, b, d]

def test_sort_resources_library_sorting_by_name():
    # these libraries are all at the same level so should be sorted by name
    X = Library('X', '')
    Y = Library('Y', '')
    Z = Library('Z', '')

    a = Resource(X, 'a.js')
    b = Resource(Y, 'b.js')
    c = Resource(Z, 'c.js')

    needed = NeededResources()
    needed.need(a)
    needed.need(b)
    needed.need(c)

    assert needed.resources() == [a, b, c]

def test_sort_resources_library_sorting_by_name_deeper():
    X = Library('X', '')
    Y = Library('Y', '')
    Z = Library('Z', '')

    # only X and Z will be at the same level now
    a = Resource(X, 'a.js')
    c = Resource(Z, 'c.js')
    b = Resource(Y, 'b.js', depends=[a, c])

    needed = NeededResources()
    needed.need(b)
    assert needed.resources() == [a, c, b]

def test_library_nr():
    X = Library('X', '')
    Y = Library('Y', '')
    Z = Library('Z', '')

    # only X and Z will be at the same level now
    a = Resource(X, 'a.js')
    c = Resource(Z, 'c.js')
    b = Resource(Y, 'b.js', depends=[a, c])

    X.init_library_nr()
    Y.init_library_nr()
    Z.init_library_nr()

    assert a.library.library_nr == 0
    assert c.library.library_nr == 0
    assert b.library.library_nr == 1

def test_library_dependency_cycles():
    A = Library('A', '')
    B = Library('B', '')

    a1 = Resource(A, 'a1.js')
    b1 = Resource(B, 'b1.js')
    a2 = Resource(A, 'a2.js', depends=[b1])

    # This definition would create a library dependency cycle if permitted.
    with pytest.raises(LibraryDependencyCycleError):
        b2 = Resource(B, 'b2.js', depends=[a1])

    # This is an example of an indirect library dependency cycle.
    C = Library('C', '')
    D = Library('D', '')
    E = Library('E', '')
    c1 = Resource(C, 'c1.js')
    d1 = Resource(D, 'd1.js', depends=[c1])
    d2 = Resource(D, 'd2.js')
    e1 = Resource(E, 'e1.js', depends=[d2])

    # ASCII ART
    #
    #  C      E      D
    #
    #  c1 <--------- d1
    #
    #  c2 --> e1 --> d2
    #
    with pytest.raises(LibraryDependencyCycleError):
        c2 = Resource(C, 'c2.js', depends=[e1])


def test_sort_resources_topological():
    foo = Library('foo', '')

    a1 = Resource(foo, 'a1.js')
    a2 = Resource(foo, 'a2.js', depends=[a1])
    a3 = Resource(foo, 'a3.js', depends=[a2])
    a5 = Resource(foo, 'a5.js', depends=[a3])

    assert sort_resources_topological([a5, a3, a1, a2]) == [a1, a2, a3, a5]

def test_bundle():
    foo = Library('foo', '')
    a = Resource(foo, 'a.css')
    b = Resource(foo, 'b.css')

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)

    resources = bundle_resources(needed.resources())
    assert len(resources) == 1
    bundle = resources[0]
    assert bundle.resources() == [a, b]

def test_bundle_dont_bundle_at_the_end():
    foo = Library('foo', '')
    a = Resource(foo, 'a.css')
    b = Resource(foo, 'b.css')
    c = Resource(foo, 'c.css', dont_bundle=True)

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)
    needed.need(c)

    resources = bundle_resources(needed.resources())
    assert len(resources) == 2
    assert resources[0].resources() == [a, b]
    assert resources[-1] is c

def test_bundle_dont_bundle_at_the_start():
    foo = Library('foo', '')
    a = Resource(foo, 'a.css', dont_bundle=True)
    b = Resource(foo, 'b.css')
    c = Resource(foo, 'c.css')

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)
    needed.need(c)

    resources = bundle_resources(needed.resources())
    assert len(resources) == 2
    assert resources[0] is a
    assert resources[1].resources() == [b, c]

def test_bundle_dont_bundle_in_the_middle():
    # now construct a scenario where a dont_bundle resource is in the way
    # of bundling
    foo = Library('foo', '')
    a = Resource(foo, 'a.css')
    b = Resource(foo, 'b.css', dont_bundle=True)
    c = Resource(foo, 'c.css')

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)
    needed.need(c)

    resources = needed.resources()
    assert len(resources) == 3
    assert resources[0] is a
    assert resources[1] is b
    assert resources[2] is c

def test_bundle_resources_bottomsafe():
    foo = Library('foo', '')
    a = Resource(foo, 'a.css')
    b = Resource(foo, 'b.css', bottom=True)

    needed = NeededResources(resources=[a,b], bundle=True)
    assert needed.render_topbottom() == ('''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/:bundle:a.css;b.css" />''', '')

    needed = NeededResources(resources=[a,b], bundle=True, bottom=True)
    assert needed.render_topbottom() == ('''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/a.css" />''', '''\
<link rel="stylesheet" type="text/css" href="/fanstatic/foo/b.css" />''')


def test_bundle_different_renderer():
    # resources with different renderers aren't bundled
    foo = Library('foo', '')
    a = Resource(foo, 'a.css')
    b = Resource(foo, 'b.js')

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)

    resources = needed.resources()

    assert len(resources) == 2
    assert resources[0] is a
    assert resources[1] is b

def test_bundle_different_library():
    # resources with different libraries aren't bundled
    l1 = Library('l1', '')
    l2 = Library('l2', '')
    a = Resource(l1, 'a.js')
    b = Resource(l2, 'b.js')

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)

    resources = needed.resources()

    assert len(resources) == 2
    assert resources[0] is a
    assert resources[1] is b

def test_bundle_different_directory():
    # resources with different directories aren't bundled
    foo = Library('foo', '')
    a = Resource(foo, 'first/a.css')
    b = Resource(foo, 'second/b.css')

    needed = NeededResources(bundle=True)
    needed.need(a)
    needed.need(b)

    resources = needed.resources()

    assert len(resources) == 2
    assert resources[0] is a
    assert resources[1] is b

def test_bundle_empty_list():
    # we can successfully bundle an empty list of resources
    needed = NeededResources(bundle=True)

    resources = needed.resources()
    assert resources == []

def test_bundle_single_entry():
    # we can successfully bundle a single resource (it's not bundled though)
    foo = Library('foo', '')
    a = Resource(foo, 'a.js')

    needed = NeededResources(bundle=True)
    needed.need(a)
    resources = needed.resources()

    assert resources == [a]

def test_bundle_single_dont_bundle_entry():
    foo = Library('foo', '')
    a = Resource(foo, 'a.js', dont_bundle=True)

    needed = NeededResources(bundle=True)
    needed.need(a)
    resources = needed.resources()

    assert resources == [a]

def test_inter_library_dependencies_ordering():
    lib1 = Library('lib1', '')
    lib2 = Library('lib2', '')
    lib3 = Library('lib3', '')
    lib4 = Library('lib4', '')

    js1 = Resource(lib1, 'js1.js')
    js2 = Resource(lib2, 'js2.js', depends=[js1])
    js3 = Resource(lib3, 'js3.js', depends=[js2])

    style1 = Resource(lib3, 'style1.css')
    style2 = Resource(lib4, 'style2.css', depends=[style1])

    needed = NeededResources()

    needed.need(js3)
    needed.need(style2)
    resources = needed.resources()
    assert resources == [style1, style2, js1, js2, js3]

def test_library_ordering_bug():
    jquery_lib = Library('jquery', '')
    jqueryui_lib = Library('jqueryui', '')
    obviel_lib = Library('obviel', '')
    bread_lib = Library('bread', '')
    app_lib = Library('app', '')

    jquery = Resource(jquery_lib, 'jquery.js')
    jqueryui = Resource(jqueryui_lib, 'jqueryui.js', depends=[jquery])

    obviel = Resource(obviel_lib, 'obviel.js', depends=[jquery])
    obviel_forms = Resource(obviel_lib, 'obviel_forms.js',
                            depends=[obviel])
    obviel_datepicker = Resource(obviel_lib, 'obviel_datepicker.js',
                                 depends=[obviel_forms, jqueryui])

    vtab = Resource(bread_lib, 'vtab.js', depends=[jqueryui])

    tabview = Resource(bread_lib, 'tabview.js', depends=[obviel, vtab])

    bread = Resource(bread_lib, 'bread.js', depends=[tabview, obviel_forms])

    app = Resource(app_lib, 'app.js', depends=[bread, obviel_datepicker])

    needed = NeededResources()

    needed.need(app)
    resources = needed.resources()
    for resource in resources:
        print resource, resource.library.library_nr
    assert resources == [jquery, jqueryui, obviel, obviel_forms,
                         obviel_datepicker, vtab, tabview, bread, app]


    #assert resources == [obviel, forms, forms_autocomplete, tabview, bread,
    #                     zorgdas]

# XXX tests for hashed resources when this is enabled. Needs some plausible
# directory to test for hashes

# XXX better error reporting if unknown extensions are used