Recognize booleans as convertible literals on object position

CHANGELOG.md

@@ -11,6 +11,10 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 
 - Don't support Elixir versions < 1.4 
 
+### Fixed
+
+- booleans weren't recognized as convertible literals on object positions  
+
 
 
 ## 0.1.1 - 2017-06-25

lib/rdf/statement.ex

@@ -57,6 +57,7 @@ defmodule RDF.Statement do
   def convert_object(uri = %URI{}), do: uri
   def convert_object(literal = %Literal{}), do: literal
   def convert_object(bnode = %BlankNode{}), do: bnode
+  def convert_object(bool) when is_boolean(bool), do: Literal.new(bool)
   def convert_object(atom) when is_atom(atom), do: RDF.uri(atom)
   def convert_object(arg), do: Literal.new(arg)
 

test/unit/description_test.exs

@@ -88,6 +88,10 @@ defmodule RDF.DescriptionTest do
               {"http://example.com/predicate", 42})
         |> description_includes_predication({EX.predicate, literal(42)})
 
+      assert Description.add(description(),
+              {"http://example.com/predicate", true})
+        |> description_includes_predication({EX.predicate, literal(true)})
+
       assert Description.add(description(),
               {"http://example.com/predicate", bnode(:foo)})
         |> description_includes_predication({EX.predicate, bnode(:foo)})