Move scheduler fake artifacts to pkg/scheduler/testing

- move some fake artifacts from pkg/scheduler/core to pkg/scheduler/testing so it can be consumed
by core as well as plugin testings

pkg/scheduler/testing/fake_plugins.go

@@ -0,0 +1,124 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+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 testing
+
+import (
+	"context"
+	"fmt"
+	"sync/atomic"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
+)
+
+// ErrReasonFake is a fake error message denotes the filter function errored.
+const ErrReasonFake = "Nodes failed the fake plugin"
+
+// FalseFilterPlugin is a filter plugin which always return Unschedulable when Filter function is called.
+type FalseFilterPlugin struct{}
+
+// Name returns name of the plugin.
+func (pl *FalseFilterPlugin) Name() string {
+	return "FalseFilter"
+}
+
+// Filter invoked at the filter extension point.
+func (pl *FalseFilterPlugin) Filter(_ context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
+	return framework.NewStatus(framework.Unschedulable, ErrReasonFake)
+}
+
+// NewFalseFilterPlugin initializes a FalseFilterPlugin and returns it.
+func NewFalseFilterPlugin(_ runtime.Object, _ framework.FrameworkHandle) (framework.Plugin, error) {
+	return &FalseFilterPlugin{}, nil
+}
+
+// TrueFilterPlugin is a filter plugin which always return Success when Filter function is called.
+type TrueFilterPlugin struct{}
+
+// Name returns name of the plugin.
+func (pl *TrueFilterPlugin) Name() string {
+	return "TrueFilter"
+}
+
+// Filter invoked at the filter extension point.
+func (pl *TrueFilterPlugin) Filter(_ context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
+	return nil
+}
+
+// NewTrueFilterPlugin initializes a TrueFilterPlugin and returns it.
+func NewTrueFilterPlugin(_ runtime.Object, _ framework.FrameworkHandle) (framework.Plugin, error) {
+	return &TrueFilterPlugin{}, nil
+}
+
+// FakeFilterPlugin is a test filter plugin to record how many times its Filter() function have
+// been called, and it returns different 'Code' depending on its internal 'failedNodeReturnCodeMap'.
+type FakeFilterPlugin struct {
+	NumFilterCalled         int32
+	FailedNodeReturnCodeMap map[string]framework.Code
+}
+
+// Name returns name of the plugin.
+func (pl *FakeFilterPlugin) Name() string {
+	return "FakeFilter"
+}
+
+// Filter invoked at the filter extension point.
+func (pl *FakeFilterPlugin) Filter(_ context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
+	atomic.AddInt32(&pl.NumFilterCalled, 1)
+
+	if returnCode, ok := pl.FailedNodeReturnCodeMap[nodeInfo.Node().Name]; ok {
+		return framework.NewStatus(returnCode, fmt.Sprintf("injecting failure for pod %v", pod.Name))
+	}
+
+	return nil
+}
+
+// NewFakeFilterPlugin initializes a fakeFilterPlugin and returns it.
+func NewFakeFilterPlugin(failedNodeReturnCodeMap map[string]framework.Code) framework.PluginFactory {
+	return func(_ runtime.Object, _ framework.FrameworkHandle) (framework.Plugin, error) {
+		return &FakeFilterPlugin{
+			FailedNodeReturnCodeMap: failedNodeReturnCodeMap,
+		}, nil
+	}
+}
+
+// MatchFilterPlugin is a filter plugin which return Success when the evaluated pod and node
+// have the same name; otherwise return Unschedulable.
+type MatchFilterPlugin struct{}
+
+// Name returns name of the plugin.
+func (pl *MatchFilterPlugin) Name() string {
+	return "MatchFilter"
+}
+
+// Filter invoked at the filter extension point.
+func (pl *MatchFilterPlugin) Filter(_ context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
+	node := nodeInfo.Node()
+	if node == nil {
+		return framework.NewStatus(framework.Error, "node not found")
+	}
+	if pod.Name == node.Name {
+		return nil
+	}
+	return framework.NewStatus(framework.Unschedulable, ErrReasonFake)
+}
+
+// NewMatchFilterPlugin initializes a MatchFilterPlugin and returns it.
+func NewMatchFilterPlugin(_ runtime.Object, _ framework.FrameworkHandle) (framework.Plugin, error) {
+	return &MatchFilterPlugin{}, nil
+}