vitess.io/vitess@v0.16.2/go/history/history_test.go (about)

     1  /*
     2  Copyright 2019 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreedto in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package history
    18  
    19  import (
    20  	"testing"
    21  )
    22  
    23  func TestHistory(t *testing.T) {
    24  	q := New(4)
    25  
    26  	i := 0
    27  	for ; i < 2; i++ {
    28  		q.Add(i)
    29  	}
    30  	want := []int{1, 0}
    31  	records := q.Records()
    32  	if want, got := len(want), len(records); want != got {
    33  		t.Errorf("len(records): want %v, got %v. records: %+v", want, got, q)
    34  	}
    35  	for i, record := range records {
    36  		if record != want[i] {
    37  			t.Errorf("record doesn't match: want %v, got %v", want[i], record)
    38  		}
    39  	}
    40  
    41  	for ; i < 6; i++ {
    42  		q.Add(i)
    43  	}
    44  
    45  	want = []int{5, 4, 3, 2}
    46  	records = q.Records()
    47  	if want, got := len(want), len(records); want != got {
    48  		t.Errorf("len(records): want %v, got %v. records: %+v", want, got, q)
    49  	}
    50  	for i, record := range records {
    51  		if record != want[i] {
    52  			t.Errorf("record doesn't match: want %v, got %v", want[i], record)
    53  		}
    54  	}
    55  }
    56  
    57  func TestLatest(t *testing.T) {
    58  	h := New(4)
    59  
    60  	// Add first value.
    61  	h.Add(mod10(1))
    62  	if got, want := int(h.Records()[0].(mod10)), 1; got != want {
    63  		t.Errorf("h.Records()[0] = %v, want %v", got, want)
    64  	}
    65  	if got, want := int(h.Latest().(mod10)), 1; got != want {
    66  		t.Errorf("h.Latest() = %v, want %v", got, want)
    67  	}
    68  
    69  	// Add value that isn't a "duplicate".
    70  	h.Add(mod10(2))
    71  	if got, want := int(h.Records()[0].(mod10)), 2; got != want {
    72  		t.Errorf("h.Records()[0] = %v, want %v", got, want)
    73  	}
    74  	if got, want := int(h.Latest().(mod10)), 2; got != want {
    75  		t.Errorf("h.Latest() = %v, want %v", got, want)
    76  	}
    77  
    78  	// Add value that IS a "duplicate".
    79  	h.Add(mod10(12))
    80  	// Records()[0] doesn't change.
    81  	if got, want := int(h.Records()[0].(mod10)), 2; got != want {
    82  		t.Errorf("h.Records()[0] = %v, want %v", got, want)
    83  	}
    84  	// Latest() does change.
    85  	if got, want := int(h.Latest().(mod10)), 12; got != want {
    86  		t.Errorf("h.Latest() = %v, want %v", got, want)
    87  	}
    88  }
    89  
    90  type duplic int
    91  
    92  func (d duplic) IsDuplicate(other any) bool {
    93  	return d == other
    94  }
    95  
    96  func TestIsEquivalent(t *testing.T) {
    97  	q := New(4)
    98  	q.Add(duplic(0))
    99  	q.Add(duplic(0))
   100  	if got, want := len(q.Records()), 1; got != want {
   101  		t.Errorf("len(q.Records())=%v, want %v", got, want)
   102  	}
   103  }
   104  
   105  type mod10 int
   106  
   107  func (m mod10) IsDuplicate(other any) bool {
   108  	return m%10 == other.(mod10)%10
   109  }