Validate that root and state paths are different.

Using the same path for both results in confusing errors when runtime.newBundle()
attempts to create the directories for the Task

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

server/server_test.go

@@ -0,0 +1,17 @@
+package server
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/context"
+)
+
+func TestNewErrorsWithSamePathForRootAndState(t *testing.T) {
+	path := "/tmp/path/for/testing"
+	_, err := New(context.Background(), &Config{
+		Root:  path,
+		State: path,
+	})
+	assert.EqualError(t, err, "root and state must be different paths")
+}