github.com/dtroyer-salad/og2/v2@v2.0.0-20240412154159-c47231610877/registry/remote/retry/policy_test.go (about)

     1  /*
     2  Copyright The ORAS Authors.
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7  http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package retry
    17  
    18  import (
    19  	"testing"
    20  	"time"
    21  )
    22  
    23  func Test_ExponentialBackoff(t *testing.T) {
    24  	testCases := []struct {
    25  		name            string
    26  		attempt         int
    27  		expectedBackoff time.Duration
    28  	}{
    29  		{
    30  			name:    "attempt 0 should have a backoff of 0,25s ± 10%",
    31  			attempt: 0, expectedBackoff: 250 * time.Millisecond,
    32  		},
    33  		{
    34  			name:    "attempt 1 should have a backoff of 0,5s ± 10%",
    35  			attempt: 1, expectedBackoff: 500 * time.Millisecond,
    36  		},
    37  		{
    38  			name:    "attempt 2 should have a backoff of 1s ± 10%",
    39  			attempt: 2, expectedBackoff: 1 * time.Second,
    40  		},
    41  		{
    42  			name:    "attempt 3 should have a backoff of 2s ± 10%",
    43  			attempt: 3, expectedBackoff: 2 * time.Second,
    44  		},
    45  		{
    46  			name:    "attempt 4 should have a backoff of 4s ± 10%",
    47  			attempt: 4, expectedBackoff: 4 * time.Second,
    48  		},
    49  		{
    50  			name:    "attempt 5 should have a backoff of 8s ± 10%",
    51  			attempt: 5, expectedBackoff: 8 * time.Second,
    52  		},
    53  	}
    54  
    55  	for _, tc := range testCases {
    56  		t.Run(tc.name, func(t *testing.T) {
    57  			b := DefaultBackoff(tc.attempt, nil)
    58  			base := float64(tc.expectedBackoff)
    59  			if !(b >= time.Duration(base*0.9) && b <= time.Duration(base+base*0.1)) {
    60  				t.Errorf("expected backoff to be %s + jitter, got %s", time.Duration(base), b)
    61  			}
    62  		})
    63  	}
    64  }