Add test for zip (#65)

* Add test for zip

Update linter config to remove warnings as project is on Go 1.19 (copyloopvar, intrange), and disable linter that forces tests to be in a separate package (testpackage)

* PR feedback

* PR feedback

zip_test.go

@@ -0,0 +1,66 @@
+package xtractr_test
+
+import (
+	"archive/zip"
+	_ "embed"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golift.io/xtractr"
+)
+
+func TestZip(t *testing.T) {
+	t.Parallel()
+	const (
+		testDataSize     = 21
+		testFileCount    = 5
+		testArchiveCount = 1
+	)
+	testFiles := []string{
+		"README.txt",
+		"subdir/",
+		"subdir/subdirfile.txt",
+		"subdir/level2/",
+		"subdir/level2/level2file.txt",
+	}
+
+	name, err := os.MkdirTemp(".", "xtractr_test_*_data")
+	require.NoError(t, err, "creating temp directory failed")
+	defer os.RemoveAll(name)
+
+	zipFile, err := os.Create(filepath.Join(name, "archive.zip"))
+	require.NoError(t, err)
+	zipWriter := zip.NewWriter(zipFile)
+
+	for _, file := range testFiles {
+		if file[len(file)-1] == '/' {
+			_, err = zipWriter.Create(file)
+			require.NoError(t, err)
+		} else {
+			f, err := zipWriter.Create(file)
+			require.NoError(t, err)
+			_, err = f.Write([]byte("content"))
+			require.NoError(t, err)
+		}
+	}
+	err = zipWriter.Close()
+	require.NoError(t, err)
+	err = zipFile.Close()
+	require.NoError(t, err)
+
+	zipTestFile := filepath.Join(name, "archive.zip")
+
+	size, files, archives, err := xtractr.ExtractFile(&xtractr.XFile{
+		FilePath:  zipTestFile,
+		OutputDir: filepath.Clean(name),
+		FileMode:  0o600,
+		DirMode:   0o700,
+	})
+	require.NoError(t, err)
+	assert.Equal(t, int64(testDataSize), size)
+	assert.Len(t, files, testFileCount)
+	assert.Len(t, archives, testArchiveCount)
+}