diff --git a/test/isn_test.exs b/test/isn_test.exs
index 6192791..701ba4d 100644
--- a/test/isn_test.exs
+++ b/test/isn_test.exs
@@ -1,6 +1,7 @@
 defmodule ISNTest do
   use ExUnit.Case, async: true
   import ISN.TestHelper
+  import ExUnit.CaptureLog
   alias Postgrex, as: P
 
   setup do
@@ -10,34 +11,53 @@ defmodule ISNTest do
   end
 
   test "encode and decode isbn", context do
-    assert [["1-937785-58-0"]] = query(context[:pid], "SELECT $1::isbn", ['1937785580'])
+    capture_log([level: :debug], fn ->
+      assert [["1-937785-58-0"]] = query(context[:pid], "SELECT $1::isbn", ['1937785580'])
+    end)
   end
 
   test "encode and decode isbn13", context do
-    assert [["978-1-937785-58-1"]] = query(context[:pid], "SELECT $1::isbn13", ['9781937785581'])
+    capture_log([level: :debug], fn ->
+      assert [["978-1-937785-58-1"]] =
+               query(context[:pid], "SELECT $1::isbn13", ['9781937785581'])
+    end)
   end
 
   test "encode and decode ismn", context do
-    assert [["M-060-11561-5"]] = query(context[:pid], "SELECT $1::ismn", ['9790060115615'])
+    capture_log([level: :debug], fn ->
+      assert [["M-060-11561-5"]] = query(context[:pid], "SELECT $1::ismn", ['9790060115615'])
+    end)
   end
 
   test "encode and decode ismn13", context do
-    assert [["979-0-060-11561-5"]] = query(context[:pid], "SELECT $1::ismn13", ['9790060115615'])
+    capture_log([level: :debug], fn ->
+      assert [["979-0-060-11561-5"]] =
+               query(context[:pid], "SELECT $1::ismn13", ['9790060115615'])
+    end)
   end
 
   test "encode and decode issn", context do
-    assert [["1436-4522"]] = query(context[:pid], "SELECT $1::issn", ['14364522'])
+    capture_log([level: :debug], fn ->
+      assert [["1436-4522"]] = query(context[:pid], "SELECT $1::issn", ['14364522'])
+    end)
   end
 
   test "encode and decode issn13", context do
-    assert [["977-1436-452-00-8"]] = query(context[:pid], "SELECT issn13(issn('1436-4522'))", [])
+    capture_log([level: :debug], fn ->
+      assert [["977-1436-452-00-8"]] =
+               query(context[:pid], "SELECT issn13(issn('1436-4522'))", [])
+    end)
   end
 
   test "encode and decode ean13", context do
-    assert [["022-035648348-1"]] = query(context[:pid], "SELECT $1::ean13", ["0220356483481"])
+    capture_log([level: :debug], fn ->
+      assert [["022-035648348-1"]] = query(context[:pid], "SELECT $1::ean13", ["0220356483481"])
+    end)
   end
 
   test "encode and decode upc", context do
-    assert [["220356483481"]] = query(context[:pid], "SELECT $1::upc", ["220356483481"])
+    capture_log([level: :debug], fn ->
+      assert [["220356483481"]] = query(context[:pid], "SELECT $1::upc", ["220356483481"])
+    end)
   end
 end