Category Archives: Testing
mmock for mocking microservices
It is a very easy to set up though pretty powerful tool with support for delays and handling query params. It also has a console for checking all the requests and corresponding responses matched. Here it is https://github.com/jmartin82/mmock. Below I describe a way to use it with docker-compose for local development.
Mocking for unit-tests and e2e-tests in golang
Some patterns to test your golang app. Mocking an interface
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 |
mockS3 := &mocks.S3API{} mockResultFn := func(input *s3.ListObjectsInput) *s3.ListObjectsOutput { output := &s3.ListObjectsOutput{} output.SetCommonPrefixes([]*s3.CommonPrefix{ &s3.CommonPrefix{ Prefix: aws.String("2017-01-01"), }, }) return output } // NB: .Return(...) must return the same signature as the method being mocked. // In this case it's (*s3.ListObjectsOutput, error). mockS3.On("ListObjects", mock.MatchedBy(func(input *s3.ListObjectsInput) bool { return input.Delimiter != nil && *input.Delimiter == "/" && input.Prefix == nil })).Return(mockResultFn, nil) listingInput := &s3.ListObjectsInput{ Bucket: aws.String("foo"), Delimiter: aws.String("/"), } listingOutput, err := mockS3.ListObjects(listingInput) if err != nil { panic(err) } for _, x := range listingOutput.CommonPrefixes { fmt.Printf("common prefix: %+v\n", *x) } |
https://github.com/vektra/mockery Mocking SQL database
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 |
// a successful case func TestShouldUpdateStats(t *testing.T) { db, mock, err := sqlmock.New() if err != nil { t.Fatalf("an error '%s' was not expected when opening a stub database connection", err) } defer db.Close() mock.ExpectBegin() mock.ExpectExec("UPDATE products").WillReturnResult(sqlmock.NewResult(1, 1)) mock.ExpectExec("INSERT INTO product_viewers").WithArgs(2, 3).WillReturnResult(sqlmock.NewResult(1, 1)) mock.ExpectCommit() // now we execute our method if err = recordStats(db, 2, 3); err != nil { t.Errorf("error was not expected while updating stats: %s", err) } // we make sure that all expectations were met if err := mock.ExpectationsWereMet(); err != nil { t.Errorf("there were unfulfilled expectations: %s", err) } } |
https://github.com/DATA-DOG/go-sqlmock Mocking HTTP server for unit-tests
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
handler := func(w http.ResponseWriter, r *http.Request) { io.WriteString(w, "<html><body>Hello World!</body></html>") } req := httptest.NewRequest("GET", "http://example.com/foo", nil) w := httptest.NewRecorder() handler(w, req) resp := w.Result() body, _ := ioutil.ReadAll(resp.Body) fmt.Println(resp.StatusCode) fmt.Println(resp.Header.Get("Content-Type")) fmt.Println(string(body)) |
https://golang.org/pkg/net/http/httptest/ Stubbing HTTP server for e2e-tests
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
{ "host": "example.com", "method": "GET|POST|PUT|PATCH|... (Mandatory)", "path": "/your/path/:variable (Mandatory)", "queryStringParameters": { "name": ["value"], "name": ["value", "value"] }, "headers": { "name": ["value"] }, "cookies": { "name": "value" }, "body": "Expected Body" } |
https://github.com/jmartin82/mmock Mocking for e2e-tests with dockertest
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
var db *sql.DB func TestMain(m *testing.M) { // uses a sensible default on windows (tcp/http) and linux/osx (socket) pool, err := dockertest.NewPool("") if err != nil { log.Fatalf("Could not connect to docker: %s", err) } // pulls an image, creates a container based on it and runs it resource, err := pool.Run("mysql", "5.7", []string{"MYSQL_ROOT_PASSWORD=secret"}) if err != nil { log.Fatalf("Could not start resource: %s", err) } // exponential backoff-retry, because the application in the container might not be ready to accept connections yet if err := pool.Retry(func() error { var err error db, err = sql.Open("mysql", fmt.Sprintf("root:secret@(localhost:%s)/mysql", resource.GetPort("3306/tcp"))) if err != nil { return err } return db.Ping() }); err != nil { log.Fatalf("Could not connect to docker: %s", err) } code := m.Run() // You can't defer this because os.Exit doesn't care for defer if err := pool.Purge(resource); err != nil { log.Fatalf("Could not purge resource: %s", err) } os.Exit(code) } func TestSomething(t *testing.T) { // db.Query() } |
https://github.com/ory/dockertest
Test Push Notifications
https://github.com/onmyway133/PushNotifications
Load testing tools
https://yandex.ru/dev/tank/ [Tool | Free] https://jmeter.apache.org/ [Tool | Free] http://tsung.erlang-projects.org/ [Tool | Free] https://gatling.io/ [Tool | Free/$] https://k6.io/ [Tool | Free/SaaS] https://locust.io/ [Tool | Free] https://loader.io/ [SaaS | Free/$] https://artillery.io [Tool | Free/$] https://github.com/wg/wrk [Tool | Free]
A way to test http client in go
A couple of ways are described here — http://hassansin.github.io/Unit-Testing-http-client-in-Go The way I liked is the following one:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 |
func Test_Mine(t *testing.T) { ... client := httpClientWithRoundTripper(http.StatusOK, "OK") ... } type roundTripFunc func(req *http.Request) *http.Response func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) { return f(req), nil } func httpClientWithRoundTripper(statusCode int, response string) *http.Client { return &http.Client{ Transport: roundTripFunc(func(req *http.Request) *http.Response { return &http.Response{ StatusCode: statusCode, Body: ioutil.NopCloser(bytes.NewBufferString(response)), } }), } } |
Golang: testing http and grpc servers
HTTP server is quite easy to test — here is a nice video about it:
E2E tests in go
I tried it via ginkgo and gomega. It has Agouti with WebDriver support out of the box, but I didn’t use it as we have grpc API. That’s the example (table tests):
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
var _ = Describe("GetRoute", func() { var ( srClient sr.Client srErr error ) JustBeforeEach(func() { srClient, srErr = GetClient() }) DescribeTable("positive cases", func(fromGeoPointID, toGeoPointID int, expectedUID string, expectedCostGreaterThan float64) { Expect(srErr).NotTo(HaveOccurred()) Expect(srClient).NotTo(BeNil()) response, err := srClient.GetRoute(context.TODO(), &sr.GetRouteRequest{ FromGeoPointId: int64(fromGeoPointID), ToGeoPointId: int64(toGeoPointID), Quantity: 1, Volume: 1, Weight: 1, }) Expect(err).To(Succeed()) Expect(response).NotTo(BeNil()) Expect(response.RouteCost).NotTo(BeNil()) Expect(response.RouteCost.RouteUid).To(HaveSuffix(expectedUID)) Expect(response.RouteCost.GetCost()).To(BeNumerically(">", expectedCostGreaterThan)) }, Entry("from(geo=3)->to(geo=2)", 3, 2, "-3-2", float64(10)), ) |
Mocking for testing go code
If you’re testing go code and have a huge API you have to mock, you have two options: make your dummy struct with embedded interface and implement only methods you need, or use your own interface that has only methods you need (and change your code to use that). For instance, I had amazon’s s3 …
BDD Framework For Golang
There is a good one: https://github.com/onsi/ginkgo It prefers to use http://onsi.github.io/gomega/ as a matcher.
Testing react’s dom with jest and enzyme
Install it like this:
|
1 |
yarn add enzyme enzyme-adapter-react-16 --registry="https://registry.npmjs.org" |