diff --git a/Project.toml b/Project.toml
index 0ade7a5..3953344 100644
--- a/Project.toml
+++ b/Project.toml
@@ -2,7 +2,7 @@ name = "CodecZlib"
 uuid = "944b1d66-785c-5afd-91f1-9de20f533193"
 license = "MIT"
 authors = ["Kenta Sato <bicycle1885@gmail.com>"]
-version = "0.7.5"
+version = "0.7.6"
 
 [deps]
 TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
@@ -11,10 +11,3 @@ Zlib_jll = "83775a58-1f1d-513f-b197-d71354ab007a"
 [compat]
 TranscodingStreams = "0.9, 0.10, 0.11"
 julia = "1.3"
-
-[extras]
-Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
-
-[targets]
-test = ["Test", "Random"]
diff --git a/test/Project.toml b/test/Project.toml
new file mode 100644
index 0000000..e4fbbc4
--- /dev/null
+++ b/test/Project.toml
@@ -0,0 +1,5 @@
+[deps]
+CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+TestsForCodecPackages = "c2e61002-3542-480d-8b3c-5f05cc4f8554"
+TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
diff --git a/test/runtests.jl b/test/runtests.jl
index 6e2fb52..8c8d879 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,13 +1,17 @@
 using CodecZlib
-using Random
 using Test
-import TranscodingStreams:
+using TranscodingStreams:
     TranscodingStreams,
-    TranscodingStream,
+    TranscodingStream
+using TestsForCodecPackages:
     test_roundtrip_read,
     test_roundtrip_write,
+    test_roundtrip_transcode,
     test_roundtrip_lines,
-    test_roundtrip_transcode
+    test_roundtrip_seekstart,
+    test_roundtrip_fileio,
+    test_chunked_read,
+    test_chunked_write
 
 const testdir = @__DIR__
 
@@ -106,9 +110,7 @@ const testdir = @__DIR__
     test_roundtrip_read(GzipCompressorStream, GzipDecompressorStream)
     test_roundtrip_write(GzipCompressorStream, GzipDecompressorStream)
     test_roundtrip_lines(GzipCompressorStream, GzipDecompressorStream)
-    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
-        TranscodingStreams.test_roundtrip_seekstart(GzipCompressorStream, GzipDecompressorStream)
-    end
+    test_roundtrip_seekstart(GzipCompressorStream, GzipDecompressorStream)
     test_roundtrip_transcode(GzipCompressor, GzipDecompressor)
 
     @test_throws ArgumentError GzipCompressor(level=10)
@@ -189,9 +191,7 @@ end
     test_roundtrip_read(ZlibCompressorStream, ZlibDecompressorStream)
     test_roundtrip_write(ZlibCompressorStream, ZlibDecompressorStream)
     test_roundtrip_lines(ZlibCompressorStream, ZlibDecompressorStream)
-    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
-        TranscodingStreams.test_roundtrip_seekstart(ZlibCompressorStream, ZlibDecompressorStream)
-    end
+    test_roundtrip_seekstart(ZlibCompressorStream, ZlibDecompressorStream)
     test_roundtrip_transcode(ZlibCompressor, ZlibDecompressor)
 
     @test_throws ArgumentError ZlibCompressor(level=10)
@@ -216,9 +216,7 @@ end
     test_roundtrip_read(DeflateCompressorStream, DeflateDecompressorStream)
     test_roundtrip_write(DeflateCompressorStream, DeflateDecompressorStream)
     test_roundtrip_lines(DeflateCompressorStream, DeflateDecompressorStream)
-    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
-        TranscodingStreams.test_roundtrip_seekstart(DeflateCompressorStream, DeflateDecompressorStream)
-    end
+    test_roundtrip_seekstart(DeflateCompressorStream, DeflateDecompressorStream)
     test_roundtrip_transcode(DeflateCompressor, DeflateDecompressor)
 
     @test DeflateCompressorStream <: TranscodingStream
@@ -231,9 +229,9 @@ end
 
 # Test APIs of TranscodingStreams.jl using the gzip compressor/decompressor.
 @testset "TranscodingStreams" begin
-    TranscodingStreams.test_chunked_read(GzipCompressor, GzipDecompressor)
-    TranscodingStreams.test_chunked_write(GzipCompressor, GzipDecompressor)
-    TranscodingStreams.test_roundtrip_fileio(GzipCompressor, GzipDecompressor)
+    test_chunked_read(GzipCompressor, GzipDecompressor)
+    test_chunked_write(GzipCompressor, GzipDecompressor)
+    test_roundtrip_fileio(GzipCompressor, GzipDecompressor)
 
     @testset "seek" begin
         data = transcode(GzipCompressor, Vector(b"abracadabra"))