SEBA-688 implement mock gRPC server and unit test the version command

Change-Id: Ia10a8ea5b00ce5d5100f8fffbefba96f234d4b32
diff --git a/commands/version_test.go b/commands/version_test.go
new file mode 100644
index 0000000..1ebe7c3
--- /dev/null
+++ b/commands/version_test.go
@@ -0,0 +1,100 @@
+/*
+ * Portions copyright 2019-present Open Networking Foundation
+ * Original copyright 2019-present Ciena Corporation
+ *
+ * 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 commands
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/opencord/cordctl/testutils"
+	"os"
+	"testing"
+)
+
+func TestVersionClientOnly(t *testing.T) {
+	expected := "" +
+		"Client:\n" +
+		" Version         unknown-version\n" +
+		" Go version:     unknown-goversion\n" +
+		" Git commit:     unknown-gitcommit\n" +
+		" Git dirty:      unknown-gitdirty\n" +
+		" Built:          unknown-buildtime\n" +
+		" OS/Arch:        unknown-os/unknown-arch\n" +
+		"\n"
+
+	got := new(bytes.Buffer)
+	OutputStream = got
+
+	var options VersionOpts
+	options.ClientOnly = true
+	err := options.Execute([]string{})
+
+	if err != nil {
+		t.Errorf("%s: Received error %v", t.Name(), err)
+		return
+	}
+
+	if got.String() != expected {
+		t.Logf("RECEIVED:\n%s\n", got.String())
+		t.Logf("EXPECTED:\n%s\n", expected)
+		t.Errorf("%s: expected and received did not match", t.Name())
+	}
+}
+
+func TestVersionClientAndServer(t *testing.T) {
+	expected := "" +
+		"Client:\n" +
+		" Version         unknown-version\n" +
+		" Go version:     unknown-goversion\n" +
+		" Git commit:     unknown-gitcommit\n" +
+		" Git dirty:      unknown-gitdirty\n" +
+		" Built:          unknown-buildtime\n" +
+		" OS/Arch:        unknown-os/unknown-arch\n" +
+		"\n" +
+		"Server:\n" +
+		" Version         3.2.6\n" +
+		" Python version: 2.7.16 (default, May  6 2019, 19:35:26)\n" +
+		" Git commit:     b0df1bf6ed1698285eda6a6725c5da0c80aa4aee\n" +
+		" Built:          2019-05-20T17:04:14Z\n" +
+		" OS/Arch:        linux/x86_64\n" +
+		"\n"
+
+	got := new(bytes.Buffer)
+	OutputStream = got
+
+	var options VersionOpts
+	err := options.Execute([]string{})
+
+	if err != nil {
+		t.Errorf("%s: Received error %v", t.Name(), err)
+		return
+	}
+
+	if got.String() != expected {
+		t.Logf("RECEIVED:\n%s\n", got.String())
+		t.Logf("EXPECTED:\n%s\n", expected)
+		t.Errorf("%s: expected and received did not match", t.Name())
+	}
+}
+
+func TestMain(m *testing.M) {
+	err := testutils.StartMockServer("data.json")
+	if err != nil {
+		fmt.Printf("Error when initializing mock server %v", err)
+		os.Exit(-1)
+	}
+	os.Exit(m.Run())
+}