1 files changed, 62 insertions, 0 deletions
diff --git a/pkg/p9/client_test.go b/pkg/p9/client_test.go
new file mode 100644
index 000000000..06302a76a
--- /dev/null
+++ b/pkg/p9/client_test.go
@@ -0,0 +1,62 @@
+// 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 p9
+
+import (
+	"syscall"
+	"testing"
+
+	"gvisor.googlesource.com/gvisor/pkg/unet"
+)
+
+// TestVersion tests the version negotiation.
+func TestVersion(t *testing.T) {
+	// First, create a new server and connection.
+	serverSocket, clientSocket, err := unet.SocketPair(false)
+	if err != nil {
+		t.Fatalf("socketpair got err %v expected nil", err)
+	}
+	defer clientSocket.Close()
+
+	// Create a new server and client.
+	s := NewServer(nil)
+	go s.Handle(serverSocket)
+
+	// NewClient does a Tversion exchange, so this is our test for success.
+	c, err := NewClient(clientSocket, 1024*1024 /* 1M message size */, HighestVersionString())
+	if err != nil {
+		t.Fatalf("got %v, expected nil", err)
+	}
+
+	// Check a bogus version string.
+	if err := c.sendRecv(&Tversion{Version: "notokay", MSize: 1024 * 1024}, &Rversion{}); err != syscall.EINVAL {
+		t.Errorf("got %v expected %v", err, syscall.EINVAL)
+	}
+
+	// Check a bogus version number.
+	if err := c.sendRecv(&Tversion{Version: "9P1000.L", MSize: 1024 * 1024}, &Rversion{}); err != syscall.EINVAL {
+		t.Errorf("got %v expected %v", err, syscall.EINVAL)
+	}
+
+	// Check a too high version number.
+	if err := c.sendRecv(&Tversion{Version: versionString(highestSupportedVersion + 1), MSize: 1024 * 1024}, &Rversion{}); err != syscall.EAGAIN {
+		t.Errorf("got %v expected %v", err, syscall.EAGAIN)
+	}
+
+	// Check an invalid MSize.
+	if err := c.sendRecv(&Tversion{Version: versionString(highestSupportedVersion), MSize: 0}, &Rversion{}); err != syscall.EINVAL {
+		t.Errorf("got %v expected %v", err, syscall.EINVAL)
+	}
+}