diff --git a/lib/rdf/data.ex b/lib/rdf/data.ex
index 717e7c8..6d41cb2 100644
--- a/lib/rdf/data.ex
+++ b/lib/rdf/data.ex
@@ -54,3 +54,26 @@ defprotocol RDF.Data do
   def statement_count(data)
 
 end
+
+defimpl RDF.Data, for: RDF.Description do
+  def delete(%RDF.Description{subject: subject} = description,
+             %RDF.Description{subject: other_subject})
+    when subject != other_subject,
+    do: description
+  def delete(description, statements), do: RDF.Description.delete(description, statements)
+  def pop(description),                do: RDF.Description.pop(description)
+
+  def include?(description, statements),
+    do: RDF.Description.include?(description, statements)
+
+  def statements(description), do: RDF.Description.statements(description)
+  def predicates(description), do: RDF.Description.predicates(description)
+  def objects(description),    do: RDF.Description.objects(description)
+  def subjects(%RDF.Description{subject: subject}), do: MapSet.new([subject])
+
+  def resources(%RDF.Description{subject: subject} = description),
+    do: RDF.Description.resources(description) |> MapSet.put(subject)
+
+  def subject_count(_),             do: 1
+  def statement_count(description), do: RDF.Description.count(description)
+end
diff --git a/lib/rdf/description.ex b/lib/rdf/description.ex
index 814d7df..129d38a 100644
--- a/lib/rdf/description.ex
+++ b/lib/rdf/description.ex
@@ -519,26 +519,3 @@ defimpl Enumerable, for: RDF.Description do
   def member?(desc, triple),  do: {:ok, RDF.Description.include?(desc, triple)}
   def count(desc),            do: {:ok, RDF.Description.count(desc)}
 end
-
-defimpl RDF.Data, for: RDF.Description do
-  def delete(%RDF.Description{subject: subject} = description,
-             %RDF.Description{subject: other_subject})
-    when subject != other_subject,
-    do: description
-  def delete(description, statements), do: RDF.Description.delete(description, statements)
-  def pop(description),                do: RDF.Description.pop(description)
-
-  def include?(description, statements),
-    do: RDF.Description.include?(description, statements)
-
-  def statements(description), do: RDF.Description.statements(description)
-  def predicates(description), do: RDF.Description.predicates(description)
-  def objects(description),    do: RDF.Description.objects(description)
-  def subjects(%RDF.Description{subject: subject}), do: MapSet.new([subject])
-
-  def resources(%RDF.Description{subject: subject} = description),
-    do: RDF.Description.resources(description) |> MapSet.put(subject)
-
-  def subject_count(_),             do: 1
-  def statement_count(description), do: RDF.Description.count(description)
-end
diff --git a/test/support/rdf_case.ex b/test/support/rdf_case.ex
index 3f849bc..3fa8b11 100644
--- a/test/support/rdf_case.ex
+++ b/test/support/rdf_case.ex
@@ -16,6 +16,8 @@ defmodule RDF.Test.Case do
 
       import RDF, only: [uri: 1, literal: 1, bnode: 1]
       import unquote(__MODULE__)
+
+      import RDF.Sigils
     end
   end
 
diff --git a/test/unit/data_test.exs b/test/unit/data_test.exs
new file mode 100644
index 0000000..b156ddd
--- /dev/null
+++ b/test/unit/data_test.exs
@@ -0,0 +1,67 @@
+defmodule RDF.DataTest do
+  use RDF.Test.Case
+
+  describe "RDF.Data protocol implementation of RDF.Description" do
+    setup do
+      {:ok,
+        description: Description.new(EX.S, [
+          {EX.p1, [EX.O1, EX.O2]},
+          {EX.p2, EX.O3},
+          {EX.p3, [~B<foo>, ~L"bar"]},
+        ])
+      }
+    end
+
+    test "delete", %{description: description} do
+      assert RDF.Data.delete(description, {EX.S, EX.p1, EX.O2}) ==
+              Description.delete(description, {EX.S, EX.p1, EX.O2})
+
+      assert RDF.Data.delete(description, {EX.Other, EX.p1, EX.O2}) == description
+    end
+
+    test "deleting a Description with a different subject does nothing", %{description: description} do
+      assert RDF.Data.delete(description,
+              %Description{description | subject: EX.Other}) == description
+    end
+
+    test "pop", %{description: description} do
+      assert RDF.Data.pop(description) == Description.pop(description)
+    end
+
+    test "include?", %{description: description} do
+      assert RDF.Data.include?(description, {EX.S, EX.p1, EX.O2})
+      refute RDF.Data.include?(description, {EX.Other, EX.p1, EX.O2})
+    end
+
+    test "statements", %{description: description} do
+      assert RDF.Data.statements(description) == Description.statements(description)
+    end
+
+    test "subjects", %{description: description} do
+      assert RDF.Data.subjects(description) == MapSet.new([uri(EX.S)])
+    end
+
+    test "predicates", %{description: description} do
+      assert RDF.Data.predicates(description) == MapSet.new([EX.p1, EX.p2, EX.p3])
+    end
+
+    test "objects", %{description: description} do
+      assert RDF.Data.objects(description) ==
+              MapSet.new([uri(EX.O1), uri(EX.O2), uri(EX.O3), ~B<foo>])
+    end
+
+    test "resources", %{description: description} do
+      assert RDF.Data.resources(description) ==
+              MapSet.new([uri(EX.S), EX.p1, EX.p2, EX.p3, uri(EX.O1), uri(EX.O2), uri(EX.O3), ~B<foo>])
+    end
+
+    test "subject_count", %{description: description} do
+      assert RDF.Data.subject_count(description) == 1
+    end
+
+    test "statement_count", %{description: description} do
+      assert RDF.Data.statement_count(description) == 5
+    end
+  end
+
+end
diff --git a/test/unit/description_test.exs b/test/unit/description_test.exs
index 1b0ea5d..4440e6a 100644
--- a/test/unit/description_test.exs
+++ b/test/unit/description_test.exs
@@ -382,68 +382,4 @@ defmodule RDF.DescriptionTest do
 
   end
 
-  describe "RDF.Data protocol implementation" do
-    setup do
-      {:ok,
-        description: Description.new(EX.S, [
-          {EX.p1, [EX.O1, EX.O2]},
-          {EX.p2, EX.O3},
-          {EX.p3, [~B<foo>, ~L"bar"]},
-        ])
-      }
-    end
-
-    test "delete", %{description: description} do
-      assert RDF.Data.delete(description, {EX.S, EX.p1, EX.O2}) ==
-              Description.delete(description, {EX.S, EX.p1, EX.O2})
-
-      assert RDF.Data.delete(description, {EX.Other, EX.p1, EX.O2}) == description
-    end
-
-    test "deleting a Description with a different subject does nothing", %{description: description} do
-      assert RDF.Data.delete(description,
-              %Description{description | subject: EX.Other}) == description
-    end
-
-    test "pop", %{description: description} do
-      assert RDF.Data.pop(description) == Description.pop(description)
-    end
-
-    test "include?", %{description: description} do
-      assert RDF.Data.include?(description, {EX.S, EX.p1, EX.O2})
-      refute RDF.Data.include?(description, {EX.Other, EX.p1, EX.O2})
-    end
-
-    test "statements", %{description: description} do
-      assert RDF.Data.statements(description) == Description.statements(description)
-    end
-
-    test "subjects", %{description: description} do
-      assert RDF.Data.subjects(description) == MapSet.new([uri(EX.S)])
-    end
-
-    test "predicates", %{description: description} do
-      assert RDF.Data.predicates(description) == MapSet.new([EX.p1, EX.p2, EX.p3])
-    end
-
-    test "objects", %{description: description} do
-      assert RDF.Data.objects(description) ==
-              MapSet.new([uri(EX.O1), uri(EX.O2), uri(EX.O3), ~B<foo>])
-    end
-
-    test "resources", %{description: description} do
-      assert RDF.Data.resources(description) ==
-              MapSet.new([uri(EX.S), EX.p1, EX.p2, EX.p3, uri(EX.O1), uri(EX.O2), uri(EX.O3), ~B<foo>])
-    end
-
-    test "subject_count", %{description: description} do
-      assert RDF.Data.subject_count(description) == 1
-    end
-
-    test "statement_count", %{description: description} do
-      assert RDF.Data.statement_count(description) == 5
-    end
-
-  end
-
 end