Tests: Do not assume empty vectors alias

Currently, TS uses Base.mightalias to throw an error if the two inputs to three-
arg transcode alias.
Two problems here: Base.mightalias is internal, and the new memory PR to Julia
changes aliasing of zero-length arrays.
The temporary fix for now is to remove the test that tests that zero-length
arrays trips the Base.mightalias. Later, let's fix this properly by not relying
on Base internals in TS tests.

Project.toml

@@ -2,7 +2,7 @@ name = "TranscodingStreams"
 uuid = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
 license = "MIT"
 authors = ["Kenta Sato <[email protected]>"]
-version = "0.10.0"
+version = "0.10.1"
 
 [deps]
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"

test/codecnoop.jl

@@ -189,8 +189,9 @@
     @test transcode(Noop, data)  == data
     @test transcode(Noop, data) !== data
 
-    data = Vector{UInt8}()
-    @test TranscodingStreams.unsafe_transcode!(Noop(), data, data) == data
+    data = UInt8[]
+    @test transcode(Noop(), data, data) == data
+    data = [0x01, 0x02]
     @test_throws AssertionError transcode(Noop(), data, data)
     data = b""
     @test transcode(Noop(), data)  == data