chore(test): requestDefaults tests

Closes #296

tests/fixtures/shared/config.json

diff --git a/tests/fixtures/shared/config.json b/tests/fixtures/shared/config.json
index 148e0c1..d8d1f32 100644
--- a/tests/fixtures/shared/config.json
+++ b/tests/fixtures/shared/config.json
@@ -13,6 +13,14 @@
 , { "path"     : "/_all_dbs"
   , "response" : "{}"
   }
+, { "path"     : "/_all_dbs"
+  , "status"   : 401
+  , "response" : "{}"
+  }
+, { "path"     : "/foo/_all_docs"
+  , "status"   : 401
+  , "response" : "{}"
+  }
 , { "method"   : "delete"
   , "path"     : "/shared_config"
   , "response" : "{ \"ok\": true }"

tests/integration/shared/config.js

diff --git a/tests/integration/shared/config.js b/tests/integration/shared/config.js
index 0b00e2e..0636e8d 100644
--- a/tests/integration/shared/config.js
+++ b/tests/integration/shared/config.js
@@ -146,3 +146,50 @@
 
   assert.end();
 });
+
+it('should accept requestDefaults', function(assert) {
+  var nanoWithDefaultHeaders = Nano({
+    url: helpers.couch,
+    requestDefaults: {
+      auth: {
+        user: 'wiki',
+        pass: 'pedia'
+      }
+    }
+  });
+
+  var req = nanoWithDefaultHeaders.db.list(function(err) {
+    assert.equal(err.statusCode, 401, 'should be access denied');
+    assert.end();
+  });
+
+  assert.equal(
+    req.headers['authorization'],
+    'Basic d2lraTpwZWRpYQ==',
+    'header `Authorization` honored');
+});
+
+it('should preserve requestDefaults on database api', function(assert) {
+  var nanoWithDefaultHeaders = Nano({
+    url: helpers.couch,
+    requestDefaults: {
+      auth: {
+        user: 'wiki',
+        pass: 'pedia'
+      }
+    }
+  });
+
+  var nanoDatabaseWithDefaultHeaders = nanoWithDefaultHeaders.use('foo');
+
+  var req = nanoDatabaseWithDefaultHeaders.list(function(err) {
+    assert.equal(err.statusCode, 401, 'should be access denied');
+    assert.end();
+  });
+
+  assert.equal(
+    req.headers['authorization'],
+    'Basic d2lraTpwZWRpYQ==',
+    'header `Authorization` honored');
+});
+