diff --git a/metrics-server/pkg/sources/fake/fakes.go b/metrics-server/pkg/sources/fake/fakes.go
new file mode 100644
index 0000000..4bbc9f9
--- /dev/null
+++ b/metrics-server/pkg/sources/fake/fakes.go
@@ -0,0 +1,46 @@
+// Copyright 2018 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 fake
+
+import (
+	"context"
+
+	"github.com/kubernetes-incubator/metrics-server/pkg/sources"
+)
+
+// StaticSourceProvider is a fake sources.MetricSourceProvider that returns
+// metrics from a static list.
+type StaticSourceProvider []sources.MetricSource
+
+func (p StaticSourceProvider) GetMetricSources() ([]sources.MetricSource, error) { return p, nil }
+
+// FunctionSource is a sources.MetricSource that calls a function to
+// return the given data points
+type FunctionSource struct {
+	SourceName    string
+	GenerateBatch CollectFunc
+}
+
+func (f *FunctionSource) Name() string {
+	return f.SourceName
+}
+
+func (f *FunctionSource) Collect(ctx context.Context) (*sources.MetricsBatch, error) {
+	return f.GenerateBatch(ctx)
+}
+
+// CollectFunc is the function signature of FunctionSource#GenerateBatch,
+// and knows how to generate a MetricsBatch.
+type CollectFunc func(context.Context) (*sources.MetricsBatch, error)