gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/runsc/sandbox/memory_test.go (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     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  package sandbox
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"math"
    21  	"strings"
    22  	"testing"
    23  )
    24  
    25  func TestTotalSystemMemory(t *testing.T) {
    26  	for _, tc := range []struct {
    27  		name    string
    28  		content string
    29  		want    uint64
    30  		err     string
    31  	}{
    32  		{
    33  			name:    "simple",
    34  			content: "MemTotal: 123\n",
    35  			want:    123,
    36  		},
    37  		{
    38  			name:    "kb",
    39  			content: "MemTotal: 123 kB\n",
    40  			want:    123 * 1024,
    41  		},
    42  		{
    43  			name:    "multi-line",
    44  			content: "Something: 123\nMemTotal: 456\nAnotherThing: 789\n",
    45  			want:    456,
    46  		},
    47  		{
    48  			name:    "not-found",
    49  			content: "Something: 123 kB\nAnotherThing: 789 kB\n",
    50  			err:     "not found",
    51  		},
    52  		{
    53  			name:    "no-number",
    54  			content: "MemTotal: \n",
    55  			err:     "malformed",
    56  		},
    57  		{
    58  			name:    "only-unit",
    59  			content: "MemTotal: kB\n",
    60  			err:     "invalid syntax",
    61  		},
    62  		{
    63  			name:    "negative",
    64  			content: "MemTotal: -1\n",
    65  			err:     "invalid syntax",
    66  		},
    67  		{
    68  			name:    "overflow",
    69  			content: fmt.Sprintf("MemTotal: %d kB\n", uint64(math.MaxUint64)),
    70  			err:     "too large",
    71  		},
    72  		{
    73  			name:    "unkown-unit",
    74  			content: "MemTotal: 123 mB\n",
    75  			err:     "unknown unit",
    76  		},
    77  	} {
    78  		t.Run(tc.name, func(t *testing.T) {
    79  			mem, err := parseTotalSystemMemory(bytes.NewReader([]byte(tc.content)))
    80  			if len(tc.err) > 0 {
    81  				if err == nil || !strings.Contains(err.Error(), tc.err) {
    82  					t.Errorf("parseTotalSystemMemory(%q) invalid error: %v, want: %v", tc.content, err, tc.err)
    83  				}
    84  			} else {
    85  				if tc.want != mem {
    86  					t.Errorf("parseTotalSystemMemory(%q) got: %v, want: %v", tc.content, mem, tc.want)
    87  				}
    88  			}
    89  		})
    90  	}
    91  }