Add an integration test demoing streams (#301)

Closes #288

Project.toml

@@ -10,9 +10,10 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 julia = "0.7, 1"
 
 [extras]
+ColorTypes = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
 FilePathsBase = "48062228-2e41-5def-b9a4-89aafe57970f"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["FilePathsBase", "Random", "Test"]
+test = ["ColorTypes", "FilePathsBase", "Random", "Test"]

src/loadsave.jl

@@ -163,6 +163,7 @@ end
 
 function checkpath_load(file)
     file === nothing && return nothing   # likely stream io
+    isa(file, IO) && return nothing
     !isfile(file) && throw(ArgumentError("No file exists at given path: $file"))
     return nothing
 end

test/integration.jl

@@ -0,0 +1,18 @@
+using FileIO
+using ColorTypes
+using ColorTypes.FixedPointNumbers
+using Pkg
+using Test
+
+@testset "Integration" begin
+    if haskey(ENV, "CI") && Base.VERSION >= v"1.3"
+        Pkg.add("ImageIO")
+        img = rand(RGB{N0f8}, 50, 50)
+        io = IOBuffer()
+        save(Stream{format"PNG"}(io), img)
+        buf = take!(io)
+        io2 = IOBuffer(buf)
+        img2 = load(io2)
+        @test img2 == img
+    end
+end

test/runtests.jl

@@ -16,4 +16,5 @@ end
     include("loadsave.jl")
     include("error_handling.jl")
     include("test_mimesave.jl")
+    include("integration.jl")
 end