diff --git a/Project.toml b/Project.toml
index 5fa9ee9..db4fe7b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -2,7 +2,7 @@ name = "CodecBase"
 uuid = "6c391c72-fb7b-5838-ba82-7cfb1bcfecbf"
 license = "MIT"
 authors = ["Kenta Sato <bicycle1885@gmail.com>"]
-version = "0.3.3"
+version = "0.3.4"
 
 [deps]
 TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
@@ -10,10 +10,3 @@ TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
 [compat]
 TranscodingStreams = "0.9, 0.10, 0.11"
 julia = "1"
-
-[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..7f35531
--- /dev/null
+++ b/test/Project.toml
@@ -0,0 +1,5 @@
+[deps]
+CodecBase = "6c391c72-fb7b-5838-ba82-7cfb1bcfecbf"
+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 c2d8e2e..34248b5 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,12 +1,13 @@
 using CodecBase
 using Test
-using Random
-import TranscodingStreams:
+using TranscodingStreams:
     TranscodingStreams,
-    TranscodingStream,
+    TranscodingStream
+using TestsForCodecPackages:
     test_roundtrip_read,
     test_roundtrip_write,
     test_roundtrip_lines,
+    test_roundtrip_seekstart,
     test_roundtrip_transcode
 
 @testset "DecodeError" begin
@@ -67,9 +68,7 @@ end
     test_roundtrip_read(Base16EncoderStream, Base16DecoderStream)
     test_roundtrip_write(Base16EncoderStream, Base16DecoderStream)
     test_roundtrip_lines(Base16EncoderStream, Base16DecoderStream)
-    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
-        TranscodingStreams.test_roundtrip_seekstart(Base16EncoderStream, Base16DecoderStream)
-    end
+    test_roundtrip_seekstart(Base16EncoderStream, Base16DecoderStream)
     test_roundtrip_transcode(Base16Encoder, Base16Decoder)
 end
 
@@ -121,9 +120,7 @@ end
     test_roundtrip_read(Base32EncoderStream, Base32DecoderStream)
     test_roundtrip_write(Base32EncoderStream, Base32DecoderStream)
     test_roundtrip_lines(Base32EncoderStream, Base32DecoderStream)
-    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
-        TranscodingStreams.test_roundtrip_seekstart(Base32EncoderStream, Base32DecoderStream)
-    end
+    test_roundtrip_seekstart(Base32EncoderStream, Base32DecoderStream)
     test_roundtrip_transcode(Base32Encoder, Base32Decoder)
 end
 
@@ -174,8 +171,6 @@ end
     test_roundtrip_read(Base64EncoderStream, Base64DecoderStream)
     test_roundtrip_write(Base64EncoderStream, Base64DecoderStream)
     test_roundtrip_lines(Base64EncoderStream, Base64DecoderStream)
-    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
-        TranscodingStreams.test_roundtrip_seekstart(Base64EncoderStream, Base64DecoderStream)
-    end
+    test_roundtrip_seekstart(Base64EncoderStream, Base64DecoderStream)
     test_roundtrip_transcode(Base64Encoder, Base64Decoder)
 end