/*
Copyright 2021 The Kruise Authors.
Copyright 2015 The Kubernetes Authors.

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 expose

import (
	"net/http"
	"strings"
	"testing"

	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/client-go/rest/fake"
	cmdtesting "k8s.io/kubectl/pkg/cmd/testing"
	"k8s.io/kubectl/pkg/scheme"
)

func TestRunExposeService(t *testing.T) {
	tests := []struct {
		name     string
		args     []string
		ns       string
		calls    map[string]string
		input    runtime.Object
		flags    map[string]string
		output   runtime.Object
		expected string
		status   int
	}{
		{
			name: "expose-service-from-service-no-selector-defined",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"app": "go"},
				},
			},
			expected: "service/foo exposed",
			status:   200,
		},
		{
			name: "expose-service-from-service",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"func": "stream"},
				},
			},
			expected: "service/foo exposed",
			status:   200,
		},
		{
			name: "no-name-passed-from-the-cli",
			args: []string{"service", "mayor"},
			ns:   "default",
			calls: map[string]string{
				"GET":  "/namespaces/default/services/mayor",
				"POST": "/namespaces/default/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "mayor", Namespace: "default", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"run": "this"},
				},
			},
			// No --name flag specified below. Service will use the rc's name passed via the 'default-name' parameter
			flags: map[string]string{"selector": "run=this", "port": "80", "labels": "runas=amayor"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "mayor", Namespace: "", Labels: map[string]string{"runas": "amayor"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolTCP,
							Port:       80,
							TargetPort: intstr.FromInt(80),
						},
					},
					Selector: map[string]string{"run": "this"},
				},
			},
			expected: "service/mayor exposed",
			status:   200,
		},
		{
			name: "expose-service",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test", "type": "LoadBalancer", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"func": "stream"},
					Type:     corev1.ServiceTypeLoadBalancer,
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-affinity-service",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test", "type": "LoadBalancer", "session-affinity": "ClientIP", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector:        map[string]string{"func": "stream"},
					Type:            corev1.ServiceTypeLoadBalancer,
					SessionAffinity: corev1.ServiceAffinityClientIP,
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-service-cluster-ip",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test", "cluster-ip": "10.10.10.10", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector:  map[string]string{"func": "stream"},
					ClusterIP: "10.10.10.10",
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-headless-service",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test", "cluster-ip": "None", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector:  map[string]string{"func": "stream"},
					ClusterIP: corev1.ClusterIPNone,
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-headless-service-no-port",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "name": "foo", "labels": "svc=test", "cluster-ip": "None", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports:     []corev1.ServicePort{},
					Selector:  map[string]string{"func": "stream"},
					ClusterIP: corev1.ClusterIPNone,
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-from-file",
			args: []string{},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/redis-master",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "redis-master", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"filename": "../../../testdata/redis-master-service.yaml", "selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"func": "stream"},
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "truncate-name",
			args: []string{"pod", "a-name-that-is-toooo-big-for-a-service-because-it-can-only-handle-63-characters"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/pods/a-name-that-is-toooo-big-for-a-service-because-it-can-only-handle-63-characters",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Pod{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
			},
			flags: map[string]string{"selector": "svc=frompod", "port": "90", "labels": "svc=frompod", "generator": "service/v2"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "a-name-that-is-toooo-big-for-a-service-because-it-can-only-handle-63-characters"[:63], Namespace: "", Labels: map[string]string{"svc": "frompod"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolTCP,
							Port:       90,
							TargetPort: intstr.FromInt(90),
						},
					},
					Selector: map[string]string{"svc": "frompod"},
				},
			},
			expected: "service/a-name-that-is-toooo-big-for-a-service-because-it-can-only-hand exposed",
			status:   200,
		},
		{
			name: "expose-multiport-object",
			args: []string{"service", "foo"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/foo",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "multiport"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolTCP,
							Port:       80,
							TargetPort: intstr.FromInt(80),
						},
						{
							Protocol:   corev1.ProtocolTCP,
							Port:       443,
							TargetPort: intstr.FromInt(443),
						},
					},
				},
			},
			flags: map[string]string{"selector": "svc=fromfoo", "generator": "service/v2", "name": "fromfoo", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "fromfoo", Namespace: "", Labels: map[string]string{"svc": "multiport"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Name:       "port-1",
							Protocol:   corev1.ProtocolTCP,
							Port:       80,
							TargetPort: intstr.FromInt(80),
						},
						{
							Name:       "port-2",
							Protocol:   corev1.ProtocolTCP,
							Port:       443,
							TargetPort: intstr.FromInt(443),
						},
					},
					Selector: map[string]string{"svc": "fromfoo"},
				},
			},
			expected: "service/fromfoo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-multiprotocol-object",
			args: []string{"service", "foo"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/foo",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "multiport"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolTCP,
							Port:       80,
							TargetPort: intstr.FromInt(80),
						},
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       8080,
							TargetPort: intstr.FromInt(8080),
						},
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       8081,
							TargetPort: intstr.FromInt(8081),
						},
						{
							Protocol:   corev1.ProtocolSCTP,
							Port:       8082,
							TargetPort: intstr.FromInt(8082),
						},
					},
				},
			},
			flags: map[string]string{"selector": "svc=fromfoo", "generator": "service/v2", "name": "fromfoo", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "fromfoo", Namespace: "", Labels: map[string]string{"svc": "multiport"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Name:       "port-1",
							Protocol:   corev1.ProtocolTCP,
							Port:       80,
							TargetPort: intstr.FromInt(80),
						},
						{
							Name:       "port-2",
							Protocol:   corev1.ProtocolUDP,
							Port:       8080,
							TargetPort: intstr.FromInt(8080),
						},
						{
							Name:       "port-3",
							Protocol:   corev1.ProtocolUDP,
							Port:       8081,
							TargetPort: intstr.FromInt(8081),
						},
						{
							Name:       "port-4",
							Protocol:   corev1.ProtocolSCTP,
							Port:       8082,
							TargetPort: intstr.FromInt(8082),
						},
					},
					Selector: map[string]string{"svc": "fromfoo"},
				},
			},
			expected: "service/fromfoo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-service-from-service-no-selector-defined-sctp",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"protocol": "SCTP", "port": "14", "name": "foo", "labels": "svc=test"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolSCTP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"app": "go"},
				},
			},
			expected: "service/foo exposed",
			status:   200,
		},
		{
			name: "expose-service-from-service-sctp",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "SCTP", "port": "14", "name": "foo", "labels": "svc=test"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolSCTP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"func": "stream"},
				},
			},
			expected: "service/foo exposed",
			status:   200,
		},
		{
			name: "expose-service-cluster-ip-sctp",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "SCTP", "port": "14", "name": "foo", "labels": "svc=test", "cluster-ip": "10.10.10.10", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolSCTP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector:  map[string]string{"func": "stream"},
					ClusterIP: "10.10.10.10",
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "expose-headless-service-sctp",
			args: []string{"service", "baz"},
			ns:   "test",
			calls: map[string]string{
				"GET":  "/namespaces/test/services/baz",
				"POST": "/namespaces/test/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "SCTP", "port": "14", "name": "foo", "labels": "svc=test", "cluster-ip": "None", "dry-run": "client"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolSCTP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector:  map[string]string{"func": "stream"},
					ClusterIP: corev1.ClusterIPNone,
				},
			},
			expected: "service/foo exposed (dry run)",
			status:   200,
		},
		{
			name: "namespace-yaml",
			args: []string{"service", "baz"},
			ns:   "testns",
			calls: map[string]string{
				"GET":  "/namespaces/testns/services/baz",
				"POST": "/namespaces/testns/services",
			},
			input: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "baz", Namespace: "testns", ResourceVersion: "12"},
				Spec: corev1.ServiceSpec{
					Selector: map[string]string{"app": "go"},
				},
			},
			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "name": "foo", "labels": "svc=test", "type": "LoadBalancer", "dry-run": "client", "output": "yaml"},
			output: &corev1.Service{
				ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "", Labels: map[string]string{"svc": "test"}},
				Spec: corev1.ServiceSpec{
					Ports: []corev1.ServicePort{
						{
							Protocol:   corev1.ProtocolUDP,
							Port:       14,
							TargetPort: intstr.FromInt(14),
						},
					},
					Selector: map[string]string{"func": "stream"},
					Type:     corev1.ServiceTypeLoadBalancer,
				},
			},
			expected: "namespace: testns",
			status:   200,
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			tf := cmdtesting.NewTestFactory().WithNamespace(test.ns)
			defer tf.Cleanup()

			codec := scheme.Codecs.LegacyCodec(scheme.Scheme.PrioritizedVersionsAllGroups()...)
			ns := scheme.Codecs.WithoutConversion()

			tf.Client = &fake.RESTClient{
				GroupVersion:         schema.GroupVersion{Version: "v1"},
				NegotiatedSerializer: ns,
				Client: fake.CreateHTTPClient(func(req *http.Request) (*http.Response, error) {
					switch p, m := req.URL.Path, req.Method; {
					case p == test.calls[m] && m == "GET":
						return &http.Response{StatusCode: test.status, Header: cmdtesting.DefaultHeader(), Body: cmdtesting.ObjBody(codec, test.input)}, nil
					case p == test.calls[m] && m == "POST":
						return &http.Response{StatusCode: test.status, Header: cmdtesting.DefaultHeader(), Body: cmdtesting.ObjBody(codec, test.output)}, nil
					default:
						t.Fatalf("unexpected request: %#v\n%#v", req.URL, req)
						return nil, nil
					}
				}),
			}

			ioStreams, _, buf, _ := genericclioptions.NewTestIOStreams()
			cmd := NewCmdExposeService(tf, ioStreams)
			cmd.SetOutput(buf)
			for flag, value := range test.flags {
				cmd.Flags().Set(flag, value)
			}
			cmd.Run(cmd, test.args)

			out := buf.String()

			if test.expected == "" {
				t.Errorf("%s: Invalid test case. Specify expected result.\n", test.name)
			}

			if !strings.Contains(out, test.expected) {
				t.Errorf("%s: Unexpected output! Expected\n%s\ngot\n%s", test.name, test.expected, out)
			}
		})
	}
}
