Handle resolving of terms from undefined modules consistently

CHANGELOG.md

@@ -24,6 +24,12 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
     - `RDF.Literal.InvalidError` instead of `RDF.InvalidLiteralError`
     - `RDF.Namespace.InvalidVocabBaseIRIError` instead of `RDF.Namespace.InvalidVocabBaseURIError`
 
+### Fixed
+
+- when trying to resolve a term from an undefined module a `RDF.Namespace.UndefinedTermError`
+  exception
+
+
 [Compare v0.2.0...HEAD](https://github.com/marcelotto/rdf-ex/compare/v0.2.0...HEAD)
 
 

lib/rdf/namespace.ex

@@ -52,7 +52,8 @@ defmodule RDF.Namespace do
   defp do_resolve_term(RDF, term), do: do_resolve_term(RDF.NS.RDF, term)
 
   defp do_resolve_term(namespace, term) do
-    if Keyword.has_key?(namespace.__info__(:functions), :__resolve_term__) do
+    if Code.ensure_compiled?(namespace) and
+        Keyword.has_key?(namespace.__info__(:functions), :__resolve_term__)do
       namespace.__resolve_term__(term)
     else
       raise RDF.Namespace.UndefinedTermError,

test/unit/vocabulary_namespace_test.exs

@@ -738,6 +738,9 @@ defmodule RDF.Vocabulary.NamespaceTest do
     assert_raise RDF.Namespace.UndefinedTermError, fn -> RDF.iri(ExUnit.Test) end
   end
 
+  test "resolving an non-existing RDF.Namespace module" do
+    assert_raise RDF.Namespace.UndefinedTermError, fn -> RDF.iri(NonExisting.Test) end
+  end
 
   describe "term resolution in a strict vocab namespace" do
     alias TestNS.{ExampleFromGraph, ExampleFromNTriplesFile, StrictExampleFromTerms}