From f83a19676c0b53b2c2240d11d58e9d35c31d9ff5 Mon Sep 17 00:00:00 2001
From: Solly Ross <sross@redhat.com>
Date: Wed, 11 Oct 2017 14:21:29 -0400
Subject: [PATCH] [client-go] fake discovery returns server groups

The fake discovery client currently returns `nil, nil` for several
methods.  Among them is the `ServerGroups` method, which is used by the
discovery REST mapper implementations.  This updates the fake discovery
client to actually return server groups so that the discovery REST
mapper can be used in tests.
---
 .../client-go/discovery/fake/discovery.go     | 39 ++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/staging/src/k8s.io/client-go/discovery/fake/discovery.go b/staging/src/k8s.io/client-go/discovery/fake/discovery.go
index 13ccebfa74f..984a0ba1ec6 100644
--- a/staging/src/k8s.io/client-go/discovery/fake/discovery.go
+++ b/staging/src/k8s.io/client-go/discovery/fake/discovery.go
@@ -68,7 +68,44 @@ func (c *FakeDiscovery) ServerPreferredNamespacedResources() ([]*metav1.APIResou
 }
 
 func (c *FakeDiscovery) ServerGroups() (*metav1.APIGroupList, error) {
-	return nil, nil
+	action := testing.ActionImpl{
+		Verb:     "get",
+		Resource: schema.GroupVersionResource{Resource: "group"},
+	}
+	c.Invokes(action, nil)
+
+	groups := map[string]*metav1.APIGroup{}
+
+	for _, res := range c.Resources {
+		gv, err := schema.ParseGroupVersion(res.GroupVersion)
+		if err != nil {
+			return nil, err
+		}
+		group := groups[gv.Group]
+		if group == nil {
+			group = &metav1.APIGroup{
+				Name: gv.Group,
+				PreferredVersion: metav1.GroupVersionForDiscovery{
+					GroupVersion: res.GroupVersion,
+					Version:      gv.Version,
+				},
+			}
+			groups[gv.Group] = group
+		}
+
+		group.Versions = append(group.Versions, metav1.GroupVersionForDiscovery{
+			GroupVersion: res.GroupVersion,
+			Version:      gv.Version,
+		})
+	}
+
+	list := &metav1.APIGroupList{}
+	for _, apiGroup := range groups {
+		list.Groups = append(list.Groups, *apiGroup)
+	}
+
+	return list, nil
+
 }
 
 func (c *FakeDiscovery) ServerVersion() (*version.Info, error) {