1 files changed, 59 insertions, 0 deletions
diff --git a/pkg/sentry/device/device_test.go b/pkg/sentry/device/device_test.go
new file mode 100644
index 000000000..dfec45046
--- /dev/null
+++ b/pkg/sentry/device/device_test.go
@@ -0,0 +1,59 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package device
+
+import (
+	"testing"
+)
+
+func TestMultiDevice(t *testing.T) {
+	device := &MultiDevice{}
+
+	// Check that Load fails to install virtual inodes that are
+	// uninitialized.
+	if device.Load(MultiDeviceKey{}, 0) {
+		t.Fatalf("got load of invalid virtual inode 0, want unsuccessful")
+	}
+
+	inode := device.Map(MultiDeviceKey{})
+
+	// Assert that the same raw device and inode map to
+	// a consistent virtual inode.
+	if i := device.Map(MultiDeviceKey{}); i != inode {
+		t.Fatalf("got inode %d, want %d in %s", i, inode, device)
+	}
+
+	// Assert that a new inode or new device does not conflict.
+	if i := device.Map(MultiDeviceKey{Device: 0, Inode: 1}); i == inode {
+		t.Fatalf("got reused inode %d, want new distinct inode in %s", i, device)
+	}
+	last := device.Map(MultiDeviceKey{Device: 1, Inode: 0})
+	if last == inode {
+		t.Fatalf("got reused inode %d, want new distinct inode in %s", last, device)
+	}
+
+	// Virtual is the virtual inode we want to load.
+	virtual := last + 1
+
+	// Assert that we can load a virtual inode at a new place.
+	if !device.Load(MultiDeviceKey{Device: 0, Inode: 2}, virtual) {
+		t.Fatalf("got load of virtual inode %d failed, want success in %s", virtual, device)
+	}
+
+	// Assert that the next inode skips over the loaded one.
+	if i := device.Map(MultiDeviceKey{Device: 0, Inode: 3}); i != virtual+1 {
+		t.Fatalf("got inode %d, want %d in %s", i, virtual+1, device)
+	}
+}