gotemplate_test.go

Documentation: k8s.io/kubernetes/cmd/gotemplate

     1  /*
     2  Copyright 2021 The Kubernetes 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 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 main
    18  
    19  import (
    20  	"bytes"
    21  	"os"
    22  	"path"
    23  	"strings"
    24  	"syscall"
    25  	"testing"
    26  
    27  	"github.com/stretchr/testify/assert"
    28  	"github.com/stretchr/testify/require"
    29  )
    30  
    31  func TestGenerate(t *testing.T) {
    32  	noFileErr := os.PathError{Op: "open", Path: "no-such-file.txt", Err: syscall.Errno(syscall.ENOENT)}
    33  	for name, tt := range map[string]struct {
    34  		in          string
    35  		data        map[string]string
    36  		files       map[string]string
    37  		expected    string
    38  		expectedErr string
    39  	}{
    40  		"missing-file": {
    41  			in:          `{{include "no-such-file.txt"}}`,
    42  			expectedErr: noFileErr.Error(),
    43  		},
    44  		"data": {
    45  			in:       `{{.Hello}} {{.World}}`,
    46  			data:     map[string]string{"Hello": "world", "World": "hello"},
    47  			expected: "world hello",
    48  		},
    49  		"include": {
    50  			in:       `{{include "test.txt" | indent 2}}`,
    51  			files:    map[string]string{"test.txt": "hello\nworld"},
    52  			expected: "hello\n  world",
    53  		},
    54  	} {
    55  		cwd, err := os.Getwd()
    56  		require.NoError(t, err)
    57  
    58  		t.Run(name, func(t *testing.T) {
    59  			tmp := t.TempDir()
    60  			for fileName, fileContent := range tt.files {
    61  				err := os.WriteFile(path.Join(tmp, fileName), []byte(fileContent), 0666)
    62  				require.NoError(t, err, "create input file")
    63  			}
    64  			defer os.Chdir(cwd)
    65  			require.NoError(t, os.Chdir(tmp), "change into tmp directory")
    66  			in := strings.NewReader(tt.in)
    67  			var out bytes.Buffer
    68  			err := generate(in, &out, tt.data)
    69  			if tt.expectedErr == "" {
    70  				require.NoError(t, err, "expand template")
    71  				require.Equal(t, tt.expected, out.String())
    72  			} else {
    73  				require.Contains(t, err.Error(), tt.expectedErr)
    74  			}
    75  		})
    76  	}
    77  }
    78  
    79  func TestIndent(t *testing.T) {
    80  	for name, tt := range map[string]struct {
    81  		numSpaces int
    82  		content   string
    83  		expected  string
    84  	}{
    85  		"empty": {
    86  			numSpaces: 10,
    87  			content:   "",
    88  			expected:  "",
    89  		},
    90  		"trailing-newline": {
    91  			numSpaces: 2,
    92  			content:   "hello\nworld\n",
    93  			expected:  "hello\n  world\n  ",
    94  		},
    95  		"no-trailing-newline": {
    96  			numSpaces: 1,
    97  			content:   "hello\nworld",
    98  			expected:  "hello\n world",
    99  		},
   100  		"zero-indent": {
   101  			numSpaces: 0,
   102  			content:   "hello\nworld",
   103  			expected:  "hello\nworld",
   104  		},
   105  	} {
   106  		t.Run(name, func(t *testing.T) {
   107  			assert.Equal(t, tt.expected, indent(tt.numSpaces, tt.content))
   108  		})
   109  	}
   110  }
   111
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