diff --git a/pkg/server/nimble/net.go b/pkg/server/nimble/net.go
index 50cdc42fd..65cfc5d48 100644
--- a/pkg/server/nimble/net.go
+++ b/pkg/server/nimble/net.go
@@ -118,7 +118,7 @@ func (n *nimbleNet) Listen(nett, laddr string) (net.Listener, error) {
 			return nil, iodine.New(err, nil)
 		}
 		return n.ListenTCP(nett, addr)
-	case "unix", "unixpacket", "invalid_unix_net_for_test":
+	case "unix", "unixpacket":
 		addr, err := net.ResolveUnixAddr(nett, laddr)
 		if err != nil {
 			return nil, iodine.New(err, nil)
diff --git a/pkg/server/nimble/net_test.go b/pkg/server/nimble/net_test.go
new file mode 100644
index 000000000..f7757d140
--- /dev/null
+++ b/pkg/server/nimble/net_test.go
@@ -0,0 +1,78 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, 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 nimble
+
+import (
+	"os"
+	"regexp"
+	"testing"
+
+	. "github.com/minio/check"
+	"github.com/minio/minio/pkg/iodine"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func (s *MySuite) TestEmptyCountEnvVariable(c *C) {
+	os.Setenv(envCountKey, "")
+	n := &nimbleNet{}
+	c.Assert(n.getInheritedListeners(), IsNil)
+}
+
+func (s *MySuite) TestZeroCountEnvVariable(c *C) {
+	os.Setenv(envCountKey, "0")
+	n := &nimbleNet{}
+	c.Assert(n.getInheritedListeners(), IsNil)
+}
+
+func (s *MySuite) TestInvalidCountEnvVariable(c *C) {
+	os.Setenv(envCountKey, "a")
+	n := &nimbleNet{}
+	expected := regexp.MustCompile("^found invalid count value: LISTEN_FDS=a$")
+	err := n.getInheritedListeners()
+	c.Assert(err, Not(IsNil))
+	c.Assert(expected.MatchString(iodine.ToError(err).Error()), Equals, true)
+}
+
+func (s *MySuite) TestInheritErrorOnListenTCPWithInvalidCount(c *C) {
+	os.Setenv(envCountKey, "a")
+	n := &nimbleNet{}
+	expected := regexp.MustCompile("^found invalid count value: LISTEN_FDS=a$")
+	_, err := n.Listen("tcp", ":0")
+	c.Assert(err, Not(IsNil))
+	c.Assert(expected.MatchString(iodine.ToError(err).Error()), Equals, true)
+}
+
+func (s *MySuite) TestInvalidNetwork(c *C) {
+	os.Setenv(envCountKey, "")
+	n := &nimbleNet{}
+	_, err := n.Listen("foo", "")
+	c.Assert(err, Not(IsNil))
+	c.Assert(regexp.MustCompile("^unknown network foo$").MatchString(iodine.ToError(err).Error()), Equals, true)
+}
+
+func (s *MySuite) TestInvalidTcpAddr(c *C) {
+	os.Setenv(envCountKey, "")
+	n := &nimbleNet{}
+	_, err := n.Listen("tcp", "abc")
+	c.Assert(err, Not(IsNil))
+	c.Assert(regexp.MustCompile("^missing port in address abc$").MatchString(iodine.ToError(err).Error()), Equals, true)
+}