template / files / internal / core / file_test.go

file_test.go

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`37160b89` 2026-05-01 Pavel Safronov	1	package core
`c3fc7a22` 2022-10-30 Pavel Safronov	2
	3	import (
`bbd011d0` 2022-12-10 Pavel Safronov	4	"bufio"
`ecad2935` 2026-05-01 Pavel Safronov	5	"fmt"
`c3fc7a22` 2022-10-30 Pavel Safronov	6	"os"
`bbd011d0` 2022-12-10 Pavel Safronov	7	"strings"
`c3fc7a22` 2022-10-30 Pavel Safronov	8	"testing"
	9
	10	"github.com/stretchr/testify/assert"
	11	)
	12
	13	func TestCreateFile(t *testing.T) {
	14	// settings
	15	path := "~/test/out/test.txt"
	16	prePatternData := testPrePatternData()
	17	expectedText := "test-project-2022-04-20-16-20-69-value1"
`bbd011d0` 2022-12-10 Pavel Safronov	18	var createdFileName = ""
`c3fc7a22` 2022-10-30 Pavel Safronov	19
	20	// monkey patch
	21	applyTestMonkeyPatch(t, monkeyPatch{
`bbd011d0` 2022-12-10 Pavel Safronov	22	OSCreate: func(filename string) (*os.File, error) {
	23	assert.Equal(t, path, filename)
	24	file, err := os.CreateTemp("./test", "test")
	25	assert.Nil(t, err, "error creating temp file")
	26	assert.True(t, createdFileName == "", "createFileName should be empty")
	27	createdFileName = file.Name()
	28	return file, nil
	29	},
`c3fc7a22` 2022-10-30 Pavel Safronov	30	OSWriteFile: func(filename string, data []byte, perm os.FileMode) error {
	31	assert.Equal(t, path, filename)
	32	assert.Equal(t, perm, os.ModePerm)
	33	assert.Equal(t, string(data), expectedText)
	34	return nil
	35	},
	36	})
	37
	38	// test error path
`bbd011d0` 2022-12-10 Pavel Safronov	39	err := createFile(prePatternData, "{{.ProjectName", path, nil)
`c3fc7a22` 2022-10-30 Pavel Safronov	40	assert.NotNil(t, err)
	41
`bbd011d0` 2022-12-10 Pavel Safronov	42	// test happy path with file template
	43	err = createFile(prePatternData, "{{.ProjectName}}-{{.Year}}-{{.Month}}-{{.Day}}-{{.Hour}}-{{.Minute}}-{{.Second}}-{{.Extras.key1}}", path, nil)
	44	assert.Nil(t, err)
	45
	46	// test happy path with pipe input
	47	inputText := `line1
	48	line2
	49	line3
	50	`
	51	expectedText = inputText
	52	reader := strings.NewReader(inputText)
	53	pipeInputScanner := bufio.NewScanner(reader)
	54	err = createFile(prePatternData, "{{.ProjectName}}-{{.Year}}-{{.Month}}-{{.Day}}-{{.Hour}}-{{.Minute}}-{{.Second}}-{{.Extras.key1}}", path, pipeInputScanner)
`c3fc7a22` 2022-10-30 Pavel Safronov	55	assert.Nil(t, err)
`bbd011d0` 2022-12-10 Pavel Safronov	56	assert.NotNil(t, createdFileName)
	57	bytes, err := os.ReadFile(createdFileName)
	58	assert.Nil(t, err, "error reading file "+createdFileName)
	59	outputText := string(bytes)
	60	assert.Equal(t, inputText, outputText)
`c3fc7a22` 2022-10-30 Pavel Safronov	61
	62	// test empty template
	63	expectedText = ""
`bbd011d0` 2022-12-10 Pavel Safronov	64	err = createFile(prePatternData, "", path, nil)
`c3fc7a22` 2022-10-30 Pavel Safronov	65	assert.Nil(t, err)
	66	}
`ecad2935` 2026-05-01 Pavel Safronov	67
	68	func TestCreateFileErrors(t *testing.T) {
	69	prePatternData := testPrePatternData()
	70	path := "~/test/out/test.txt"
	71
	72	// OSCreate failure when using pipe input
	73	applyTestMonkeyPatch(t, monkeyPatch{
	74	OSCreate: func(filename string) (*os.File, error) {
	75	return nil, fmt.Errorf("create failed")
	76	},
	77	})
	78	reader := strings.NewReader("some input")
	79	scanner := bufio.NewScanner(reader)
	80	err := createFile(prePatternData, "", path, scanner)
	81	assert.NotNil(t, err)
	82	assert.Contains(t, err.Error(), "error creating file")
	83
	84	// OSWriteFile failure in template path
	85	applyTestMonkeyPatch(t, monkeyPatch{
	86	OSWriteFile: func(filename string, data []byte, perm os.FileMode) error {
	87	return fmt.Errorf("write failed")
	88	},
	89	})
	90	err = createFile(prePatternData, "{{.ProjectName}}", path, nil)
	91	assert.NotNil(t, err)
	92	assert.Contains(t, err.Error(), "error writing file")
	93
	94	// OSWriteFile failure in empty-template path
	95	err = createFile(prePatternData, "", path, nil)
	96	assert.NotNil(t, err)
	97	assert.Contains(t, err.Error(), "error writing file")
	98	}
	99
	100	func TestReadFile(t *testing.T) {
	101	f, err := os.CreateTemp("./test", "readfile-*.txt")
	102	assert.Nil(t, err)
`cd48b068` 2026-05-01 Pavel Safronov	103	defer func() { _ = os.Remove(f.Name()) }()
`ecad2935` 2026-05-01 Pavel Safronov	104
	105	content := "hello world"
	106	_, err = f.WriteString(content)
	107	assert.Nil(t, err)
`cd48b068` 2026-05-01 Pavel Safronov	108	assert.NoError(t, f.Close())
`ecad2935` 2026-05-01 Pavel Safronov	109
	110	got, err := readFile(f.Name())
	111	assert.Nil(t, err)
	112	assert.Equal(t, content, got)
	113
	114	_, err = readFile("nonexistent-file-that-does-not-exist.txt")
	115	assert.NotNil(t, err)
	116	}