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ktesting: capture log data in memory
This is useful for tests that specifically want to check for expected log output in the code that they are testing. Capturing log data is done unconditionally. Having a configuration option for it would be possible, but then usage and code become more complicated for (probably) very little performance gains in tests that don't need the captured data.
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/* | ||
Copyright 2022 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. | ||
*/ | ||
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package ktesting_test | ||
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import ( | ||
"errors" | ||
"fmt" | ||
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"k8s.io/klog/v2/ktesting" | ||
) | ||
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func ExampleUnderlier() { | ||
logger := ktesting.NewLogger(ktesting.NopTL{}, ktesting.NewConfig()) | ||
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logger.Error(errors.New("failure"), "I failed", "what", "something") | ||
logger.WithValues("request", 1).V(1).Info("hello world") | ||
logger.WithName("example").Info("with name") | ||
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underlier, ok := logger.GetSink().(ktesting.Underlier) | ||
if !ok { | ||
panic("Should have had a ktesting LogSink!?") | ||
} | ||
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t := underlier.GetUnderlying() | ||
t.Log("This goes to /dev/null...") | ||
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buffer := underlier.GetBuffer() | ||
fmt.Printf("%s\n", buffer.String()) | ||
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log := buffer.Data() | ||
for i, entry := range log { | ||
fmt.Printf("log entry #%d: %s %s %s %v err=%v\n", i, entry.Type, entry.Prefix, entry.Message, entry.KVList, entry.Err) | ||
if i > 0 && | ||
entry.Timestamp.Sub(log[i-1].Timestamp).Nanoseconds() < 0 { | ||
fmt.Printf("Unexpected timestamp order: #%d %s > #%d %s", i-1, log[i-1].Timestamp, i, entry.Timestamp) | ||
} | ||
} | ||
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// Output: | ||
// ERROR I failed err="failure" what="something" | ||
// INFO hello world request=1 | ||
// INFO example: with name | ||
// | ||
// log entry #0: ERROR I failed [what something] err=failure | ||
// log entry #1: INFO hello world [request 1] err=<nil> | ||
// log entry #2: INFO example with name [] err=<nil> | ||
} |
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