github.com/outcaste-io/ristretto@v0.2.3/z/z_test.go (about)

     1  /*
     2   * Copyright 2019 Dgraph Labs, Inc. and Contributors
     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 agreed to 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 z
    18  
    19  import (
    20  	"math"
    21  	"testing"
    22  
    23  	"github.com/stretchr/testify/require"
    24  )
    25  
    26  func verifyHashProduct(t *testing.T, wantKey, wantConflict, key, conflict uint64) {
    27  	require.Equal(t, wantKey, key)
    28  	require.Equal(t, wantConflict, conflict)
    29  }
    30  
    31  func TestKeyToHash(t *testing.T) {
    32  	var key uint64
    33  	var conflict uint64
    34  
    35  	key, conflict = KeyToHash(uint64(1))
    36  	verifyHashProduct(t, 1, 0, key, conflict)
    37  
    38  	key, conflict = KeyToHash(1)
    39  	verifyHashProduct(t, 1, 0, key, conflict)
    40  
    41  	key, conflict = KeyToHash(int32(2))
    42  	verifyHashProduct(t, 2, 0, key, conflict)
    43  
    44  	key, conflict = KeyToHash(int32(-2))
    45  	verifyHashProduct(t, math.MaxUint64-1, 0, key, conflict)
    46  
    47  	key, conflict = KeyToHash(int64(-2))
    48  	verifyHashProduct(t, math.MaxUint64-1, 0, key, conflict)
    49  
    50  	key, conflict = KeyToHash(uint32(3))
    51  	verifyHashProduct(t, 3, 0, key, conflict)
    52  
    53  	key, conflict = KeyToHash(int64(3))
    54  	verifyHashProduct(t, 3, 0, key, conflict)
    55  }
    56  
    57  func TestMulipleSignals(t *testing.T) {
    58  	closer := NewCloser(0)
    59  	require.NotPanics(t, func() { closer.Signal() })
    60  	// Should not panic.
    61  	require.NotPanics(t, func() { closer.Signal() })
    62  	require.NotPanics(t, func() { closer.SignalAndWait() })
    63  
    64  	// Attempt 2.
    65  	closer = NewCloser(1)
    66  	require.NotPanics(t, func() { closer.Done() })
    67  
    68  	require.NotPanics(t, func() { closer.SignalAndWait() })
    69  	// Should not panic.
    70  	require.NotPanics(t, func() { closer.SignalAndWait() })
    71  	require.NotPanics(t, func() { closer.Signal() })
    72  }
    73  
    74  func TestCloser(t *testing.T) {
    75  	closer := NewCloser(1)
    76  	go func() {
    77  		defer closer.Done()
    78  		<-closer.Ctx().Done()
    79  	}()
    80  	closer.SignalAndWait()
    81  }
    82  
    83  func TestZeroOut(t *testing.T) {
    84  	dst := make([]byte, 4*1024)
    85  	fill := func() {
    86  		for i := 0; i < len(dst); i++ {
    87  			dst[i] = 0xFF
    88  		}
    89  	}
    90  	check := func(buf []byte, b byte) {
    91  		for i := 0; i < len(buf); i++ {
    92  			require.Equalf(t, b, buf[i], "idx: %d", i)
    93  		}
    94  	}
    95  	fill()
    96  
    97  	ZeroOut(dst, 0, 1)
    98  	check(dst[:1], 0x00)
    99  	check(dst[1:], 0xFF)
   100  
   101  	ZeroOut(dst, 0, 1024)
   102  	check(dst[:1024], 0x00)
   103  	check(dst[1024:], 0xFF)
   104  
   105  	ZeroOut(dst, 0, len(dst))
   106  	check(dst, 0x00)
   107  }