fix: Add basic test, fix linters

cmd/root.go

@@ -23,7 +23,7 @@ var rootCmd = &cobra.Command{
 
 		targetSet := make(map[string]struct{})
 		for _, filename := range files {
-			targets, err := parseTerraformFile(filename)
+			targets, err := ParseTerraformFile(filename)
 			if err != nil {
 				log.Printf("Failed parsing %s: %v\n", filename, err)
 				continue
@@ -59,15 +59,15 @@ func init() {
 	rootCmd.Flags().BoolVarP(&asString, "string", "s", false, "Output as -target=resource strings")
 }
 
-func parseTerraformFile(filename string) ([]string, error) {
+func ParseTerraformFile(filename string) ([]string, error) {
 	content, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
 
 	file, diags := hclsyntax.ParseConfig(content, filename, hcl.InitialPos)
-	if diags.HasErrors() {
-		return nil, fmt.Errorf(diags.Error())
+	if diags != nil && diags.HasErrors() {
+		return nil, fmt.Errorf("error parsing file: %v", diags.Error())
 	}
 
 	syntaxBody, ok := file.Body.(*hclsyntax.Body)

cmd/root_test.go

@@ -0,0 +1,24 @@
+package cmd_test
+
+import (
+	"github.com/tiulpin/tftl/cmd"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseTerraformFile(t *testing.T) {
+	content := `resource "aws_instance" "example" {}`
+	tempDir := t.TempDir()
+	filePath := filepath.Join(tempDir, "test.tf")
+
+	err := os.WriteFile(filePath, []byte(content), 0644)
+	require.NoError(t, err)
+
+	targets, parseErr := cmd.ParseTerraformFile(filePath)
+	require.NoError(t, parseErr)
+	require.Equal(t, 1, len(targets))
+	require.Equal(t, "aws_instance.example", targets[0])
+}

go.mod

@@ -1,21 +1,25 @@
-module tftl
+module github.com/tiulpin/tftl
 
 go 1.24.0
 
 require (
 	github.com/hashicorp/hcl/v2 v2.23.0
 	github.com/spf13/cobra v1.9.1
+	github.com/stretchr/testify v1.10.0
 )
 
 require (
 	github.com/agext/levenshtein v1.2.1 // indirect
 	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
 	github.com/zclconf/go-cty v1.16.2 // indirect
 	golang.org/x/mod v0.8.0 // indirect
 	golang.org/x/sys v0.5.0 // indirect
 	golang.org/x/text v0.11.0 // indirect
 	golang.org/x/tools v0.6.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -15,11 +15,15 @@ github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzCv8LZP15IdmG+YdwD2luVPHITV96TkirNBM=
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
 github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
 github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
 github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/zclconf/go-cty v1.16.2 h1:LAJSwc3v81IRBZyUVQDUdZ7hs3SYs9jv0eZJDWHD/70=
 github.com/zclconf/go-cty v1.16.2/go.mod h1:VvMs5i0vgZdhYawQNq5kePSpLAoz8u1xvZgrPIxfnZE=
 github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940 h1:4r45xpDWB6ZMSMNJFMOjqrGHynW3DIBuR2H9j0ug+Mo=
@@ -34,5 +38,7 @@ golang.org/x/text v0.11.0 h1:LAntKIrcmeSKERyiOh0XMV39LXS8IE9UL2yP7+f5ij4=
 golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/tools v0.6.0 h1:BOw41kyTf3PuCW1pVQf8+Cyg8pMlkYB1oo9iJ6D/lKM=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -1,6 +1,6 @@
 package main
 
-import "tftl/cmd"
+import "github.com/tiulpin/tftl/cmd"
 
 func main() {
 	cmd.Execute()