Add configuration resource
diff --git a/rackspace/db/v1/configurations/requests_test.go b/rackspace/db/v1/configurations/requests_test.go
new file mode 100644
index 0000000..14120b3
--- /dev/null
+++ b/rackspace/db/v1/configurations/requests_test.go
@@ -0,0 +1,145 @@
+package configurations
+
+import (
+	"testing"
+
+	"github.com/rackspace/gophercloud/pagination"
+	"github.com/rackspace/gophercloud/rackspace/db/v1/instances"
+	th "github.com/rackspace/gophercloud/testhelper"
+	fake "github.com/rackspace/gophercloud/testhelper/client"
+	"github.com/rackspace/gophercloud/testhelper/fixture"
+)
+
+var (
+	configID = "{configID}"
+	_baseURL = "/configurations"
+	resURL   = _baseURL + "/" + configID
+)
+
+func TestList(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, _baseURL, "GET", "", listConfigsJSON, 200)
+
+	count := 0
+	err := List(fake.ServiceClient()).EachPage(func(page pagination.Page) (bool, error) {
+		count++
+		actual, err := ExtractConfigs(page)
+		th.AssertNoErr(t, err)
+
+		expected := []Config{exampleConfig}
+		th.AssertDeepEquals(t, expected, actual)
+
+		return true, nil
+	})
+
+	th.AssertEquals(t, 1, count)
+	th.AssertNoErr(t, err)
+}
+
+func TestGet(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, resURL, "GET", "", getConfigJSON, 200)
+
+	config, err := Get(fake.ServiceClient(), configID).Extract()
+	th.AssertNoErr(t, err)
+	th.AssertDeepEquals(t, &exampleConfig, config)
+}
+
+func TestCreate(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, _baseURL, "POST", createReq, createConfigJSON, 201)
+
+	opts := CreateOpts{
+		Datastore: &DatastoreOpts{
+			Type:    "a00000a0-00a0-0a00-00a0-000a000000aa",
+			Version: "b00000b0-00b0-0b00-00b0-000b000000bb",
+		},
+		Description: "example description",
+		Name:        "example-configuration-name",
+		Values: map[string]interface{}{
+			"collation_server": "latin1_swedish_ci",
+			"connect_timeout":  120,
+		},
+	}
+
+	config, err := Create(fake.ServiceClient(), opts).Extract()
+	th.AssertNoErr(t, err)
+	th.AssertDeepEquals(t, &exampleConfigWithValues, config)
+}
+
+func TestUpdate(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, resURL, "PATCH", updateReq, "", 200)
+
+	opts := UpdateOpts{
+		Values: map[string]interface{}{
+			"connect_timeout": 300,
+		},
+	}
+
+	err := Update(fake.ServiceClient(), configID, opts).ExtractErr()
+	th.AssertNoErr(t, err)
+}
+
+func TestReplace(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, resURL, "PUT", updateReq, "", 202)
+
+	opts := UpdateOpts{
+		Values: map[string]interface{}{
+			"connect_timeout": 300,
+		},
+	}
+
+	err := Replace(fake.ServiceClient(), configID, opts).ExtractErr()
+	th.AssertNoErr(t, err)
+}
+
+func TestDelete(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, resURL, "DELETE", "", "", 202)
+
+	err := Delete(fake.ServiceClient(), configID).ExtractErr()
+	th.AssertNoErr(t, err)
+}
+
+func TestListInstances(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	fixture.SetupHandler(t, resURL+"/instances", "GET", "", listInstancesJSON, 200)
+
+	expectedInstance := instances.Instance{
+		ID:   "d4603f69-ec7e-4e9b-803f-600b9205576f",
+		Name: "json_rack_instance",
+	}
+
+	pages := 0
+	err := ListInstances(fake.ServiceClient(), configID).EachPage(func(page pagination.Page) (bool, error) {
+		pages++
+
+		actual, err := instances.ExtractInstances(page)
+		if err != nil {
+			return false, err
+		}
+
+		th.AssertDeepEquals(t, actual, []instances.Instance{expectedInstance})
+
+		return true, nil
+	})
+
+	th.AssertNoErr(t, err)
+	th.AssertEquals(t, 1, pages)
+}