Add constraint package to let us reject invalid assignments.

pkg/constraint/constraint_test.go

@@ -0,0 +1,98 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package constraint
+
+import (
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+)
+
+func containerWithHostPorts(ports ...int) api.Container {
+	c := api.Container{}
+	for _, p := range ports {
+		c.Ports = append(c.Ports, api.Port{HostPort: p})
+	}
+	return c
+}
+
+func manifestWithContainers(containers ...api.Container) api.ContainerManifest {
+	m := api.ContainerManifest{}
+	for _, c := range containers {
+		m.Containers = append(m.Containers, c)
+	}
+	return m
+}
+
+func TestAllowed(t *testing.T) {
+	table := []struct {
+		allowed   bool
+		manifests []api.ContainerManifest
+	}{
+		{
+			allowed: true,
+			manifests: []api.ContainerManifest{
+				manifestWithContainers(
+					containerWithHostPorts(1, 2, 3),
+					containerWithHostPorts(4, 5, 6),
+				),
+				manifestWithContainers(
+					containerWithHostPorts(7, 8, 9),
+					containerWithHostPorts(10, 11, 12),
+				),
+			},
+		},
+		{
+			allowed: true,
+			manifests: []api.ContainerManifest{
+				manifestWithContainers(
+					containerWithHostPorts(0, 0),
+					containerWithHostPorts(0, 0),
+				),
+				manifestWithContainers(
+					containerWithHostPorts(0, 0),
+					containerWithHostPorts(0, 0),
+				),
+			},
+		},
+		{
+			allowed: false,
+			manifests: []api.ContainerManifest{
+				manifestWithContainers(
+					containerWithHostPorts(3, 3),
+				),
+			},
+		},
+		{
+			allowed: false,
+			manifests: []api.ContainerManifest{
+				manifestWithContainers(
+					containerWithHostPorts(6),
+				),
+				manifestWithContainers(
+					containerWithHostPorts(6),
+				),
+			},
+		},
+	}
+
+	for _, item := range table {
+		if e, a := item.allowed, Allowed(item.manifests); e != a {
+			t.Errorf("Expected %v, got %v: \n%v\v", e, a, item.manifests)
+		}
+	}
+}