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package git

import (

"fmt"

"os"

"os/exec"

"path/filepath"

"runtime"

"testing"

"github.com/stretchr/testify/assert"

"github.com/stretchr/testify/require"

)

func TestOutput(t *testing.T) {

tests := []struct {

name string

exitCode int

stdout string

stderr string

wantErr *GitError

}{

{

name: "successful command",

stdout: "hello world",

stderr: "",

exitCode: 0,

wantErr: nil,

},

{

name: "not a repo failure",

stdout: "",

stderr: "fatal: not a git repository (or any of the parent directories): .git",

exitCode: 128,

wantErr: &GitError{

ExitCode: 128,

Stderr: "fatal: not a git repository (or any of the parent directories): .git",

err: &exec.ExitError{},

},

},

}

for _, tt := range tests {

t.Run(tt.name, func(t *testing.T) {

cmd := Command{

&exec.Cmd{

Path: createMockExecutable(t, tt.stdout, tt.stderr, tt.exitCode),

},

}

out, err := cmd.Output()

if tt.wantErr != nil {

require.Error(t, err)

var gitError *GitError

require.ErrorAs(t, err, &gitError)

assert.Equal(t, tt.wantErr.ExitCode, gitError.ExitCode)

assert.Equal(t, tt.wantErr.Stderr, gitError.Stderr)

assert.Equal(t, tt.wantErr.Error(), gitError.Error())

} else {

require.NoError(t, err)

}

assert.Equal(t, tt.stdout, string(out))

})

}

}

func createMockExecutable(t *testing.T, stdout string, stderr string, exitCode int) string {

tmpDir := t.TempDir()

sourcePath := filepath.Join(tmpDir, "main.go")

binaryPath := filepath.Join(tmpDir, "mockexec")

if runtime.GOOS == "windows" {

binaryPath += ".exe"

}

// Create Go source

source := buildCommandSourceCode(exitCode, stdout, stderr)

// Write source file

if err := os.WriteFile(sourcePath, []byte(source), 0600); err != nil {

t.Fatal(err)

}

// Compile

cmd := exec.Command("go", "build", "-o", binaryPath, sourcePath)

if out, err := cmd.CombinedOutput(); err != nil {

t.Fatalf("failed to compile: %v\n%s", err, out)

}

return binaryPath

}

func buildCommandSourceCode(exitCode int, stdout, stderr string) string {

return fmt.Sprintf(`package main

import (

"fmt"

"os"

)

func main() {

fmt.Printf(%q)

fmt.Fprintf(os.Stderr, %q)

os.Exit(%d)

}`, stdout, stderr, exitCode)

}