fixes typo and now actually testing detectavi

Author: ssfrr

src/registry.jl

@@ -105,7 +105,7 @@ function detectavi(io)
     seekstart(io)
     magic = ascii(read(io, UInt8, 4))
     magic == "RIFF" || return false
-    seek(s, 8)
+    seek(io, 8)
     submagic = ascii(read(io, UInt8, 4))
 
     submagic == "AVI "

test/query.jl

@@ -293,6 +293,15 @@ context("Multiple Magic bytes") do
     end
 end
 context("AVI Detection") do
+    open(joinpath(file_dir, "bees.avi")) do s
+        @fact FileIO.detectavi(s) --> true
+    end
+    open(joinpath(file_dir, "sin.wav")) do s
+        @fact FileIO.detectavi(s) --> false
+    end
+    open(joinpath(file_dir, "magic1.tiff")) do s
+        @fact FileIO.detectavi(s) --> false
+    end
     q = query(joinpath(file_dir, "bees.avi"))
     @fact typeof(q) --> File{format"AVI"}
 end