fix auth v2 unit tests
diff --git a/openstack/identity/v2/tokens/requests.go b/openstack/identity/v2/tokens/requests.go
index 73e0b91..1c4ba7c 100644
--- a/openstack/identity/v2/tokens/requests.go
+++ b/openstack/identity/v2/tokens/requests.go
@@ -35,10 +35,16 @@
 	ToTokenV2CreateMap() (map[string]interface{}, error)
 }
 
-// AuthOptions wraps a gophercloud AuthOptions in order to adhere to the AuthOptionsBuilder
-// interface.
+// AuthOptions are the valid options for Openstack Identity v2 authentication.
+// For field descriptions, see gophercloud.AuthOptions.
 type AuthOptions struct {
-	gophercloud.AuthOptions
+	IdentityEndpoint string `json:"-"`
+	Username         string `json:"username,omitempty"`
+	Password         string `json:"password,omitempty"`
+	TenantID         string `json:"tenantId,omitempty"`
+	TenantName       string `json:"tenantName,omitempty"`
+	AllowReauth      bool   `json:"-"`
+	TokenID          string
 }
 
 // ToTokenV2CreateMap allows AuthOptions to satisfy the AuthOptionsBuilder
diff --git a/openstack/identity/v2/tokens/requests_test.go b/openstack/identity/v2/tokens/requests_test.go
index 0cbb00c..a6d16f3 100644
--- a/openstack/identity/v2/tokens/requests_test.go
+++ b/openstack/identity/v2/tokens/requests_test.go
@@ -13,7 +13,7 @@
 	defer th.TeardownHTTP()
 	HandleTokenPost(t, requestJSON)
 
-	return Create(client.ServiceClient(), AuthOptions{options})
+	return Create(client.ServiceClient(), options)
 }
 
 func tokenPostErr(t *testing.T, options gophercloud.AuthOptions, expectedErr error) {
@@ -21,7 +21,7 @@
 	defer th.TeardownHTTP()
 	HandleTokenPost(t, "")
 
-	actualErr := Create(client.ServiceClient(), AuthOptions{options}).Err
+	actualErr := Create(client.ServiceClient(), options).Err
 	th.CheckDeepEquals(t, expectedErr, actualErr)
 }