Backend: Move reusable packages to pkg/

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

pkg/fs/fs_test.go

@@ -0,0 +1,62 @@
+package fs
+
+import (
+	"os"
+	"os/user"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestExists(t *testing.T) {
+	assert.True(t, FileExists("./testdata/test.jpg"))
+	assert.False(t, FileExists("./foo.jpg"))
+}
+
+func TestOverwrite(t *testing.T) {
+	data := make([]byte, 3)
+	data[1] = 3
+	data[2] = 8
+	tmpPath := "./testdata/_tmp"
+	os.Mkdir(tmpPath, 0777)
+
+	defer os.RemoveAll(tmpPath)
+	result := Overwrite("./testdata/_tmp/notyetexisting.jpg", data)
+	assert.FileExists(t, "./testdata/_tmp/notyetexisting.jpg")
+	t.Log(result)
+
+}
+
+func TestExpandedFilename(t *testing.T) {
+	t.Run("test.jpg", func(t *testing.T) {
+		filename := ExpandFilename("./testdata/test.jpg")
+		assert.Contains(t, filename, "/testdata/test.jpg")
+		assert.IsType(t, "", filename)
+	})
+	t.Run("empty filename", func(t *testing.T) {
+		filename := ExpandFilename("")
+		assert.Equal(t, "", filename)
+		assert.IsType(t, "", filename)
+	})
+	t.Run("~ in filename", func(t *testing.T) {
+		usr, _ := user.Current()
+		expected := usr.HomeDir + "/test.jpg"
+		filename := ExpandFilename("~/test.jpg")
+		assert.Equal(t, expected, filename)
+		assert.IsType(t, "", filename)
+	})
+}
+
+func TestDirectoryIsEmpty(t *testing.T) {
+	t.Run("not empty path", func(t *testing.T) {
+		assert.Equal(t, false, IsEmpty("./testdata"))
+	})
+	t.Run("not existing path", func(t *testing.T) {
+		assert.Equal(t, false, IsEmpty("./xxx"))
+	})
+	t.Run("empty path", func(t *testing.T) {
+		os.Mkdir("./testdata/emptyDir", 0777)
+		defer os.RemoveAll("./testdata/emptyDir")
+		assert.Equal(t, true, IsEmpty("./testdata/emptyDir"))
+	})
+}