do not run each codec tests

Author: bicycle1885

src/stream.jl

@@ -45,7 +45,7 @@ Create a transcoding stream with `codec` and `stream`.
 Examples
 --------
 
-```jldoctest
+```julia
 julia> using TranscodingStreams
 
 julia> using CodecZlib
@@ -300,7 +300,7 @@ Transcode `data` by applying `codec`.
 Examples
 --------
 
-```jldoctest
+```julia
 julia> using CodecZlib
 
 julia> data = Vector{UInt8}("abracadabra");

test/runtests.jl

@@ -87,10 +87,10 @@ using Base.Test
 end
 
 installed = keys(Pkg.installed())
-for pkg in ["CodecZlib", "CodecZstd", "CodecBzip2"]
-    if pkg ∉ installed
-        # TODO: ad-hoc fix
-        Pkg.clone("https://github.com/bicycle1885/$(pkg).jl")
+for pkg in ["CodecZlib", "CodecZstd", "CodecBzip2", "CodecFoobar"]
+    if pkg ∈ installed
+        Pkg.test(pkg)
+    else
+        info("Skip ", pkg)
     end
-    Pkg.test(pkg)
 end