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Volumes that are provisioned with `VolumeMode: Block` often have a MetrucsProvider interface declared in their type. However, the MetricsProvider should implement a GetMetrics() function. In the cases where the storage drivers do not implement GetMetrics(), a panic can occur. Usual type-assertions are not sufficient in this case. All assertions assume the interface is present. There is no straight forward way to verify that a valid GetMetrics() function is provided. By adding SupportsMetrics(), storage driver implementations require careful reviewing for metrics support.
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package volume
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import (
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"testing"
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)
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func TestMetricsNilSupportsMetrics(t *testing.T) {
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metrics := &MetricsNil{}
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supported := metrics.SupportsMetrics()
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if supported {
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t.Error("Expected no support for metrics")
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}
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}
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func TestMetricsNilGetCapacity(t *testing.T) {
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metrics := &MetricsNil{}
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actual, err := metrics.GetMetrics()
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expected := &Metrics{}
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if *actual != *expected {
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t.Errorf("Expected empty Metrics, actual %v", *actual)
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}
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if err == nil {
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t.Errorf("Expected error when calling GetMetrics, actual nil")
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}
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}
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