Fixed missing iterate and length methods

Author: Ben J. Ward

Project.toml

@@ -1,7 +1,7 @@
 name = "BioSymbols"
 uuid = "3c28c6f8-a34d-59c4-9654-267d177fcfa9"
 authors = ["Ben J. Ward <benjward@protonmail.com"]
-version = "4.0.0"
+version = "4.0.1"
 
 [deps]
 Automa = "67c07d97-cdcb-5c2c-af73-a7f9c32a568b"

src/BioSymbols.jl

@@ -116,6 +116,10 @@ expected to have the following methods defined:
 """
 abstract type BioSymbol end
 
+Base.length(::BioSymbol) = 1
+Base.iterate(sym::BioSymbol) = (sym, nothing)
+Base.iterate(sym::BioSymbol, state) = nothing
+
 include("nucleicacid.jl")
 include("aminoacid.jl")
 

test/runtests.jl

@@ -11,6 +11,21 @@ function round_trip(x)
     return x == y
 end
 
+@testset "BioSymbols" begin
+    for i in alphabet(DNA)
+        @test length(i) == 1
+        @test collect(i) == [i]
+    end
+    for i in alphabet(RNA)
+        @test length(i) == 1
+        @test collect(i) == [i]
+    end
+    for i in alphabet(AminoAcid)
+        @test length(i) == 1
+        @test collect(i) == [i]
+    end
+end
+
 @testset "NucleicAcids" begin
     @testset "Conversions" begin
         @testset "UInt8" begin