SEBA-688 add additional unit tests

Change-Id: I361bc872af08b97bccb29f17838940205fed48e9
diff --git a/commands/services_test.go b/commands/services_test.go
new file mode 100644
index 0000000..3b213bf
--- /dev/null
+++ b/commands/services_test.go
@@ -0,0 +1,101 @@
+/*
+ * 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"
+	"github.com/opencord/cordctl/testutils"
+	"testing"
+)
+
+func TestServicesList(t *testing.T) {
+	// use `python -m json.tool` to pretty-print json
+	expected := `[
+		{
+			"name": "onos",
+			"state": "present",
+			"version": "2.1.1-dev"
+		},
+		{
+			"name": "kubernetes",
+			"state": "present",
+			"version": "1.2.1"
+		}
+	]`
+
+	got := new(bytes.Buffer)
+	OutputStream = got
+
+	var options ServiceOpts
+	options.List.OutputAs = "json"
+	err := options.List.Execute([]string{})
+
+	if err != nil {
+		t.Errorf("%s: Received error %v", t.Name(), err)
+		return
+	}
+
+	testutils.AssertJSONEqual(t, got.String(), expected)
+}
+
+func TestServicesListTable(t *testing.T) {
+	// We'll use the ServicesList command to be our end-to-end test for
+	// table formatted commands, as the output is relatively simple.
+	expected := `NAME          VERSION      STATE
+onos          2.1.1-dev    present
+kubernetes    1.2.1        present
+`
+
+	got := new(bytes.Buffer)
+	OutputStream = got
+
+	var options ServiceOpts
+	err := options.List.Execute([]string{})
+
+	if err != nil {
+		t.Errorf("%s: Received error %v", t.Name(), err)
+		return
+	}
+
+	testutils.AssertStringEqual(t, got.String(), expected)
+}
+
+func TestServicesListYaml(t *testing.T) {
+	// We'll use the ServicesList command to be our end-to-end test for
+	// yaml formatted commands, as the output is relatively simple.
+	expected := `- name: onos
+  version: 2.1.1-dev
+  state: present
+- name: kubernetes
+  version: 1.2.1
+  state: present
+`
+
+	got := new(bytes.Buffer)
+	OutputStream = got
+
+	var options ServiceOpts
+	options.List.OutputAs = "yaml"
+	err := options.List.Execute([]string{})
+
+	if err != nil {
+		t.Errorf("%s: Received error %v", t.Name(), err)
+		return
+	}
+
+	testutils.AssertStringEqual(t, got.String(), expected)
+}