Added tests for checksum computation in layer store

image/layers_test.go

@@ -0,0 +1,48 @@
+package image
+
+import (
+	"os"
+	"testing"
+	"io/ioutil"
+	"bytes"
+	"github.com/dotcloud/docker/future"
+	"github.com/dotcloud/docker/fake"
+)
+
+func TestAddLayer(t *testing.T) {
+	tmp, err := ioutil.TempDir("", "docker-test-image")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmp)
+	store, err := NewLayerStore(tmp)
+	if err != nil {
+		t.Fatal(err)
+	}
+	archive, err := fake.FakeTar()
+	if err != nil {
+		t.Fatal(err)
+	}
+	layer, err := store.AddLayer(archive)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := os.Stat(layer); err != nil {
+		t.Fatalf("Error testing for existence of layer: %s\n", err.Error())
+	}
+}
+
+func TestComputeId(t *testing.T) {
+	id1, err := future.ComputeId(bytes.NewBufferString("hello world\n"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	id2, err := future.ComputeId(bytes.NewBufferString("foo bar\n"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if id1 == id2 {
+		t.Fatalf("Identical checksums for difference content (%s == %s)", id1, id2)
+	}
+}
+