host_id_readfile_test.go

Documentation: go.opentelemetry.io/otel/sdk/resource

     1  // Copyright The OpenTelemetry 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  //go:build linux || dragonfly || freebsd || netbsd || openbsd || solaris
    16  
    17  package resource
    18  
    19  import (
    20  	"os"
    21  	"testing"
    22  
    23  	"github.com/stretchr/testify/require"
    24  )
    25  
    26  func TestReadFileExistent(t *testing.T) {
    27  	fileContents := "foo"
    28  
    29  	f, err := os.CreateTemp("", "readfile_")
    30  	require.NoError(t, err)
    31  
    32  	defer os.Remove(f.Name())
    33  
    34  	_, err = f.WriteString(fileContents)
    35  	require.NoError(t, err)
    36  	require.NoError(t, f.Close())
    37  
    38  	result, err := readFile(f.Name())
    39  	require.NoError(t, err)
    40  	require.Equal(t, result, fileContents)
    41  }
    42  
    43  func TestReadFileNonExistent(t *testing.T) {
    44  	// create unique filename
    45  	f, err := os.CreateTemp("", "readfile_")
    46  	require.NoError(t, err)
    47  
    48  	// make file non-existent
    49  	require.NoError(t, os.Remove(f.Name()))
    50  
    51  	_, err = readFile(f.Name())
    52  	require.ErrorIs(t, err, os.ErrNotExist)
    53  }
    54
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