porter/server/api/k8s_handler_test.go

package api_test

import (
	"encoding/json"
	"net/http"
	"net/url"
	"reflect"
	"strings"
	"testing"

	"github.com/porter-dev/porter/internal/kubernetes"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
)

// ------------------------- TEST TYPES AND MAIN LOOP ------------------------- //

type k8sTest struct {
	initializers []func(tester *tester)
	msg          string
	method       string
	endpoint     string
	body         string
	expStatus    int
	expBody      string
	useCookie    bool
	validators   []func(c *k8sTest, tester *tester, t *testing.T)
}

func testK8sRequests(t *testing.T, tests []*k8sTest, canQuery bool) {
	for _, c := range tests {
		// create a new tester
		tester := newTester(canQuery)

		// if there's an initializer, call it
		for _, init := range c.initializers {
			init(tester)
		}

		req, err := http.NewRequest(
			c.method,
			c.endpoint,
			strings.NewReader(c.body),
		)

		tester.req = req

		if c.useCookie {
			req.AddCookie(tester.cookie)
		}

		if err != nil {
			t.Fatal(err)
		}

		tester.execute()
		rr := tester.rr

		// first, check that the status matches
		if status := rr.Code; status != c.expStatus {
			t.Errorf("%s, handler returned wrong status code: got %v want %v",
				c.msg, status, c.expStatus)
		}

		// if there's a validator, call it
		for _, validate := range c.validators {
			validate(c, tester, t)
		}
	}
}

// ------------------------- TEST FIXTURES AND FUNCTIONS  ------------------------- //

var listNamespacesTests = []*k8sTest{
	&k8sTest{
		initializers: []func(tester *tester){
			initDefaultK8s,
		},
		msg:    "List namespaces",
		method: "GET",
		endpoint: "/api/k8s/namespaces?" + url.Values{
			"context": []string{"context-test"},
		}.Encode(),
		body:      "",
		expStatus: http.StatusOK,
		expBody:   objectsToJSON(defaultObjects),
		useCookie: true,
		validators: []func(c *k8sTest, tester *tester, t *testing.T){
			k8sNamespaceListValidator,
		},
	},
}

func TestHandleListNamespaces(t *testing.T) {
	testK8sRequests(t, listNamespacesTests, true)
}

// ------------------------- INITIALIZERS AND VALIDATORS ------------------------- //

var defaultObjects = []runtime.Object{
	&v1.Namespace{
		ObjectMeta: metav1.ObjectMeta{
			Name: "test-namespace-0",
		},
	},
	&v1.Namespace{
		ObjectMeta: metav1.ObjectMeta{
			Name: "test-namespace-1",
		},
	},
}

func initDefaultK8s(tester *tester) {
	initUserDefault(tester)

	agent := kubernetes.GetAgentTesting(defaultObjects...)

	// overwrite the test agent with new resources
	tester.app.TestAgents.K8sAgent = agent
}

func objectsToJSON(objs []runtime.Object) string {
	str, _ := json.Marshal(objs)

	return string(str)
}

func k8sNamespaceListValidator(c *k8sTest, tester *tester, t *testing.T) {
	gotBody := &v1.NamespaceList{}
	expBody := &[]v1.Namespace{}

	json.Unmarshal(tester.rr.Body.Bytes(), gotBody)
	json.Unmarshal([]byte(c.expBody), expBody)

	if !reflect.DeepEqual(gotBody.Items, *expBody) {
		t.Errorf("%s, handler returned wrong body: got %v want %v",
			c.msg, gotBody.Items, expBody)
	}
}