Test AbstractString StringEncoder method

Author: nalimilan

test/runtests.jl

@@ -114,22 +114,22 @@ end
 @test_throws InvalidEncodingError p = StringDecoder(IOBuffer(), "nonexistent_encoding")
 
 try
-    p = StringEncoder(IOBuffer(), "nonexistent_encoding")
+    p = StringEncoder(IOBuffer(), "nonexistent_encoding", "absurd_encoding")
 catch err
     @test isa(err, InvalidEncodingError)
     io = IOBuffer()
     showerror(io, err)
     @test takebuf_string(io) ==
-        "Conversion from UTF-8 to nonexistent_encoding not supported by iconv implementation, check that specified encodings are correct"
+        "Conversion from absurd_encoding to nonexistent_encoding not supported by iconv implementation, check that specified encodings are correct"
 end
 try
-    p = StringDecoder(IOBuffer(), "nonexistent_encoding")
+    p = StringDecoder(IOBuffer(), "nonexistent_encoding", "absurd_encoding")
 catch err
     @test isa(err, InvalidEncodingError)
     io = IOBuffer()
     showerror(io, err)
     @test takebuf_string(io) ==
-        "Conversion from nonexistent_encoding to UTF-8 not supported by iconv implementation, check that specified encodings are correct"
+        "Conversion from nonexistent_encoding to absurd_encoding not supported by iconv implementation, check that specified encodings are correct"
 end
 
 mktemp() do path, io