Tests from the image crate to be sure we don’t break them

tests/image.rs

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+#[macro_use] extern crate enum_primitive;
+
+mod gif {
+    enum_from_primitive! {
+    /// Known block types
+    enum Block {
+        Image = 0x2C,
+        Extension = 0x21,
+        Trailer = 0x3B
+    }
+    }
+
+    enum_from_primitive! {
+    /// Known GIF extensions
+    enum Extension {
+        Text = 0x01,
+        Control = 0xF9,
+        Comment = 0xFE,
+        Application = 0xFF
+    }
+    }
+
+    enum_from_primitive! {
+    /// Method to dispose the image
+    enum DisposalMethod {
+        Undefined = 0,
+        None = 1,
+        Previous = 2,
+        Background = 3
+    }
+    }
+}
+
+mod png {
+    enum_from_primitive! {
+    #[derive(Clone, Copy, Debug, PartialEq)]
+    enum InterlaceMethod {
+        None = 0,
+        Adam7 = 1
+    }
+    }
+
+    enum_from_primitive! {
+    #[derive(Debug)]
+    pub enum FilterType {
+        NoFilter = 0,
+        Sub = 1,
+        Up = 2,
+        Avg = 3,
+        Paeth = 4
+    }
+    }
+}
+
+mod tiff {
+    enum_from_primitive! {
+    #[derive(Clone, Copy, Debug, PartialEq)]
+    enum PhotometricInterpretation {
+        WhiteIsZero = 0,
+        BlackIsZero = 1,
+        RGB = 2,
+        RGBPalette = 3,
+        TransparencyMask = 4,
+        CMYK = 5,
+        YCbCr = 6,
+        CIELab = 8,
+    }
+    }
+
+    enum_from_primitive! {
+    #[derive(Clone, Copy, Debug)]
+    enum CompressionMethod {
+        None = 1,
+        Huffman = 2,
+        Fax3 = 3,
+        Fax4 = 4,
+        LZW = 5,
+        JPEG = 6,
+        PackBits = 32773
+    }
+    }
+
+    enum_from_primitive! {
+    #[derive(Clone, Copy, Debug)]
+    enum PlanarConfiguration {
+        Chunky = 1,
+        Planar = 2
+    }
+    }
+
+    enum_from_primitive! {
+    #[derive(Clone, Copy, Debug)]
+    enum Predictor {
+        None = 1,
+        Horizontal = 2
+    }
+    }
+
+    enum_from_primitive! {
+    #[derive(Clone, Copy, Debug)]
+    pub enum Type {
+        BYTE = 1,
+        ASCII = 2,
+        SHORT = 3,
+        LONG = 4,
+        RATIONAL = 5,
+    }
+    }
+}