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RFC: pure go stateful fuzz test generator
Purpose of this patch is to drop dependency to fMBT in e2e fuzz test generation. This patch implements parts that were needed from fMBT in go and includes an example for generating tests: a model and a logic what to cover and how to cover it. Signed-off-by: Antti Kervinen <[email protected]>
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test/e2e/policies.test-suite/topology-aware/n4c16/test06-fuzz/generate.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| "fmt" | ||
|
|
||
| m "github.com/containers/nri-plugins/test/gofmbt" | ||
| ) | ||
|
|
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| type TestState struct { | ||
| cpu int | ||
| mem int | ||
| rescpu int | ||
| podCpuMem map[string][2]int | ||
| } | ||
|
|
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| func (s *TestState) String() string { | ||
| return fmt.Sprintf("[cpu:%d mem:%d pods:%v]", s.cpu, s.mem, s.podCpuMem) | ||
| } | ||
|
|
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| func createPod(pod string, contcount, cpu, mem int) m.StateChange { | ||
| return func(current m.State) m.State { | ||
| s := current.(*TestState) | ||
| if s.cpu < cpu*contcount || s.mem < mem*contcount { | ||
| // refuse from state change if not enough resources | ||
| return nil | ||
| } | ||
| if _, ok := s.podCpuMem[pod]; ok { | ||
| // refuse to create pod if it is already running | ||
| return nil | ||
| } | ||
| newPodCpuMem := make(map[string][2]int) | ||
| for k, v := range s.podCpuMem { | ||
| newPodCpuMem[k] = v | ||
| } | ||
| newPodCpuMem[pod] = [2]int{cpu * contcount, mem * contcount} | ||
| return &TestState{ | ||
| cpu: s.cpu - cpu*contcount, | ||
| mem: s.mem - mem*contcount, | ||
| podCpuMem: newPodCpuMem, | ||
| } | ||
| } | ||
| } | ||
|
|
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| func deletePod(pod string) m.StateChange { | ||
| return func(current m.State) m.State { | ||
| s := current.(*TestState) | ||
| cpumem, ok := s.podCpuMem[pod] | ||
| if !ok { | ||
| // refuse to delete pod if it is not running | ||
| return nil | ||
| } | ||
| newPodCpuMem := make(map[string][2]int) | ||
| for k, v := range s.podCpuMem { | ||
| if k != pod { | ||
| newPodCpuMem[k] = v | ||
| } | ||
| } | ||
| return &TestState{ | ||
| cpu: s.cpu + cpumem[0], | ||
| mem: s.mem + cpumem[1], | ||
| podCpuMem: newPodCpuMem, | ||
| } | ||
| } | ||
| } | ||
|
|
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| var ( | ||
| maxMem int | ||
| maxCpu int | ||
| maxReservedCpu int | ||
| maxTestSteps int | ||
| ) | ||
|
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| func main() { | ||
| flag.IntVar(&maxMem, "mem", 7500, "memory available for test pods") | ||
| flag.IntVar(&maxCpu, "cpu", 15000, "non-reserved milli-CPU available for test pods") | ||
| flag.IntVar(&maxReservedCpu, "reserved-cpu", 1000, "reserved milli-CPU availble for test pods") | ||
| flag.IntVar(&maxTestSteps, "test-steps", 3000, "number of test steps") | ||
| flag.Parse() | ||
|
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| podNames := []string{"gu0", "gu1", "gu2", "gu3", "gu4", "bu0", "bu1", "be0", "be1"} | ||
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| model := m.NewModel() | ||
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| model.From(func(current m.State) []*m.Transition { | ||
| s := current.(*TestState) | ||
| return m.When(s.cpu > 0 && s.mem > 0, | ||
| m.OnAction("NAME=gu0 CONTCOUNT=1 CPU=200m MEM=1500M create guaranteed").Do(createPod("gu0", 1, 200, 1500)), | ||
| m.OnAction("NAME=gu1 CONTCOUNT=2 CPU=1000m MEM=500M create guaranteed").Do(createPod("gu1", 2, 1000, 500)), | ||
| m.OnAction("NAME=gu2 CONTCOUNT=2 CPU=1200m MEM=4500M create guaranteed").Do(createPod("gu2", 2, 1200, 4500)), | ||
| m.OnAction("NAME=gu3 CONTCOUNT=3 CPU=2000m MEM=500M create guaranteed").Do(createPod("gu3", 3, 2000, 500)), | ||
| m.OnAction("NAME=gu4 CONTCOUNT=1 CPU=4200m MEM=100M create guaranteed").Do(createPod("gu4", 1, 4200, 100)), | ||
| m.OnAction("NAME=bu0 CONTCOUNT=1 CPU=1200m MEM=50M CPUREQ=900m MEMREQ=49M CPULIM=1200m MEMLIM=50M create burstable").Do(createPod("bu0", 1, 1200, 50)), | ||
| m.OnAction("NAME=bu1 CONTCOUNT=2 CPU=1900m MEM=300M CPUREQ=1800m MEMREQ=299M CPULIM=1900m MEMLIM=300M create burstable").Do(createPod("bu1", 2, 1900, 300)), | ||
| m.OnAction("NAME=be0 CONTCOUNT=1 CPU=0 MEM=0 create besteffort").Do(createPod("be0", 1, 0, 0)), | ||
| m.OnAction("NAME=be1 CONTCOUNT=3 CPU=0 MEM=0 create besteffort").Do(createPod("be1", 3, 0, 0))) | ||
| }) | ||
|
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| model.From(func(current m.State) []*m.Transition { | ||
| s := current.(*TestState) | ||
| ts := []*m.Transition{} | ||
| for _, pod := range podNames { | ||
| if _, ok := s.podCpuMem[pod]; ok { | ||
| ts = append(ts, m.OnAction("NAME=%s kubectl delete pod %s --now", pod, pod).Do(deletePod(pod))...) | ||
| } | ||
| } | ||
| return ts | ||
| }) | ||
|
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| coverer := m.NewCoverer() | ||
| coverer.CoverActionCombinations(3) | ||
|
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| var state m.State | ||
|
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| state = &TestState{ | ||
| cpu: maxCpu, | ||
| mem: maxMem, | ||
| rescpu: maxReservedCpu, | ||
| } | ||
| testStep := 0 | ||
| for testStep < maxTestSteps { | ||
| path, covStats := coverer.BestPath(model, state, 4) | ||
| if len(path) == 0 { | ||
| fmt.Printf("# did not find anything to cover\n") | ||
| break | ||
| } | ||
| for i := 0; i < covStats.MaxStep+1; i++ { | ||
| testStep++ | ||
| step := path[i] | ||
| fmt.Printf("\n# step %d, coverage: %d, state: %v\n", testStep, coverer.Coverage(), state) | ||
| fmt.Println(step.Action()) | ||
| state = step.EndState() | ||
| coverer.MarkCovered(step) | ||
| coverer.UpdateCoverage() | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // Copyright The NRI Plugins Authors. 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. | ||
|
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| package gofmbt | ||
|
|
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| import ( | ||
| "fmt" | ||
| ) | ||
|
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| type Action struct { | ||
| name string | ||
| format string | ||
| args []interface{} | ||
| } | ||
|
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| func NewAction(format string, args ...interface{}) *Action { | ||
| return &Action{ | ||
| format: format, | ||
| args: args, | ||
| name: fmt.Sprintf(format, args...), | ||
| } | ||
| } | ||
|
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| func (a *Action) String() string { | ||
| return a.name | ||
| } | ||
|
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| func OnAction(format string, args ...interface{}) *Action { | ||
| return NewAction(format, args...) | ||
| } | ||
|
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| func (a *Action) Do(stateChanges ...StateChange) []*Transition { | ||
| stateChange := func(s State) State { | ||
| for _, sc := range stateChanges { | ||
| s = sc(s) | ||
| } | ||
| return s | ||
| } | ||
| return []*Transition{NewTransition(a, stateChange)} | ||
| } |
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