add test case for available cgroups

client/fingerprint/cgroup_test.go

@@ -121,4 +121,30 @@ func TestCGroupFingerprint(t *testing.T) {
 			t.Fatalf("unexpected attribute found, %s", a)
 		}
 	}
+	{
+		f := &CGroupFingerprint{
+			logger:             testLogger(),
+			lastState:          cgroupAvailable,
+			mountPointDetector: &MountPointDetectorValidMountPoint{},
+		}
+
+		node := &structs.Node{
+			Attributes: make(map[string]string),
+		}
+
+		request := &cstructs.FingerprintRequest{Config: &config.Config{}, Node: node}
+		response := &cstructs.FingerprintResponse{
+			Attributes: make(map[string]string, 0),
+			Links:      make(map[string]string, 0),
+			Resources:  &structs.Resources{},
+		}
+
+		err := f.Fingerprint(request, response)
+		if err != nil {
+			t.Fatalf("unexpected error, %s", err)
+		}
+		if a, _ := response.Attributes["unique.cgroup.mountpoint"]; a == "" {
+			t.Fatalf("expected attribute to be found, %s", a)
+		}
+	}
 }