class Shrine::Storage::Linter

   # File lib/shrine/storage/linter.rb
37 def call(io_factory = default_io_factory)
38   storage.upload(io_factory.call, id = "foo", shrine_metadata: { "foo" => "bar" })
39 
40   lint_open(id)
41   lint_exists(id)
42   lint_url(id)
43   lint_delete(id)
44 
45   if storage.respond_to?(:delete_prefixed)
46     storage.upload(io_factory.call, id1 = "a/a/a")
47     storage.upload(io_factory.call, id2 = "a/a/b")
48     storage.upload(io_factory.call, id3 = "a/aaa/a")
49 
50     lint_delete_prefixed(prefix: "a/a/",
51                          expect_deleted: [id1, id2],
52                          expect_remaining: [id3])
53 
54     storage.delete(id3)
55   end
56 
57   if storage.respond_to?(:clear!)
58     storage.upload(io_factory.call, id = "quux".dup)
59     lint_clear(id)
60   end
61 
62   if storage.respond_to?(:presign)
63     lint_presign(id)
64   end
65 
66   true
67 end

    # File lib/shrine/storage/linter.rb
104 def lint_clear(id)
105   storage.clear!
106   error :clear!, "file still #exists? after clearing" if storage.exists?(id)
107 end

    # File lib/shrine/storage/linter.rb
 94 def lint_delete(id)
 95   storage.delete(id)
 96   error :delete, "file still #exists? after deleting" if storage.exists?(id)
 97   begin
 98     storage.delete(id)
 99   rescue => exception
100     error :delete, "shouldn't fail if the file doesn't exist, but raised #{exception.class}"
101   end
102 end

    # File lib/shrine/storage/linter.rb
116 def lint_delete_prefixed(prefix:, expect_deleted:, expect_remaining:)
117   storage.delete_prefixed(prefix)
118 
119   expect_deleted.each do |key|
120     next unless storage.exists?(key)
121     error :delete_prefixed, "#{key} still #exists? after #clear_prefix('a/a/')"
122   end
123 
124   expect_remaining.each do |key|
125     next if storage.exists?(key)
126     error :delete_prefixed, "#{key} doesn't #exists? but should after #clear_prefix('a/a/')"
127   end
128 end

   # File lib/shrine/storage/linter.rb
84 def lint_exists(id)
85   error :exists?, "returns false for a file that was uploaded" if !storage.exists?(id)
86 end

   # File lib/shrine/storage/linter.rb
69 def lint_open(id)
70   opened = storage.open(id)
71   error :open, "doesn't return a valid IO object" if !io?(opened)
72   error :open, "returns an empty IO object" if opened.read.empty?
73   opened.close
74 
75   begin
76     storage.open(@nonexisting)
77     error :open, "should raise an exception on nonexisting file"
78   rescue Shrine::FileNotFound
79   rescue => exception
80     error :open, "should raise Shrine::FileNotFound on nonexisting file"
81   end
82 end

    # File lib/shrine/storage/linter.rb
109 def lint_presign(id)
110   data = storage.presign(id)
111   error :presign, "result should be a Hash" unless data.respond_to?(:to_h)
112   error :presign, "result should include :method key" unless data.to_h.key?(:method)
113   error :presign, "result should include :url key" unless data.to_h.key?(:url)
114 end

   # File lib/shrine/storage/linter.rb
88 def lint_url(id)
89   # just assert #url exists, it isn't required to return anything
90   url = storage.url(id)
91   error :url, "should return either nil or a string" if !(url.nil? || url.is_a?(String))
92 end