// +build !windows
 
 package layer
 

 import (
 	"testing"
 )

 
 func graphDiffSize(ls Store, l Layer) (int64, error) {
 	cl := getCachedLayer(l)
 	var parent string
 	if cl.parent != nil {
 		parent = cl.parent.cacheID
 	}

 	return ls.(*layerStore).driver.DiffSize(cl.cacheID, parent)

 }
 
 // Unix as Windows graph driver does not support Changes which is indirectly
 // invoked by calling DiffSize on the driver
 func TestLayerSize(t *testing.T) {

 	ls, _, cleanup := newTestStore(t)

 	defer cleanup()
 
 	content1 := []byte("Base contents")
 	content2 := []byte("Added contents")
 
 	layer1, err := createLayer(ls, "", initWithFiles(newTestFile("file1", content1, 0644)))
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	layer2, err := createLayer(ls, layer1.ChainID(), initWithFiles(newTestFile("file2", content2, 0644)))
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	layer1DiffSize, err := graphDiffSize(ls, layer1)
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	if int(layer1DiffSize) != len(content1) {
 		t.Fatalf("Unexpected diff size %d, expected %d", layer1DiffSize, len(content1))
 	}
 
 	layer1Size, err := layer1.Size()
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	if expected := len(content1); int(layer1Size) != expected {
 		t.Fatalf("Unexpected size %d, expected %d", layer1Size, expected)
 	}
 
 	layer2DiffSize, err := graphDiffSize(ls, layer2)
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	if int(layer2DiffSize) != len(content2) {
 		t.Fatalf("Unexpected diff size %d, expected %d", layer2DiffSize, len(content2))
 	}
 
 	layer2Size, err := layer2.Size()
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	if expected := len(content1) + len(content2); int(layer2Size) != expected {
 		t.Fatalf("Unexpected size %d, expected %d", layer2Size, expected)
 	}
 
 }