Test case part for integration testing article

integration_test.go

// successLoginTest contains context for the test case. The value of each field is
// initialize on setup test case setp and will be the reference for clean up the data on clean().
type successLoginTest struct {
	id    int64
	email string
	pass  string
}

// createVerifiedUser creates a user to be tested for login API.
func (s *successLoginTest) createVerifiedUser(e *exampleTestSuite) {
	row := e.db.QueryRow(
		`INSERT INTO admin (email, password, status) VALUES ($1, $2, $3) returning id`,
		s.email, s.pass, "verified")
	err := row.Scan(&s.id)
	e.NoError(err, "failed to insert user")
}

func (s *successLoginTest) loginAPICall(e *exampleTestSuite) *http.Response {
	c := http.Client{}
	req, err := http.NewRequest(http.MethodPost, "http://localhost:8080/login", nil)
	e.NoError(err, "failed to create a request")

	resp, err := c.Do(req)
	e.NoError(err, "failed to do request")

	return resp
}

// clean cleans predefined data or produced data from the test case.
func (s *successLoginTest) clean(e *exampleTestSuite) {
	_, err := e.db.Exec(`DELETE FROM admin WHERE id = $1`, s.id)
	e.NoError(err, "failed to delete user")
}

func (s *successLoginTest) assertLoginSuccessful(e *exampleTestSuite, resp *http.Response) {
	e.Equal(http.StatusOK, resp.StatusCode, "receive non 200 - OK")
	
	buf, err := ioutil.ReadAll(resp.Body)
	defer resp.Body.Close()
	e.NoError(err, "failed to read response body")

	// Do all the assertion related to the response body.
	e.NotEmpty(buf)
}

// TestSuccessLogin test case that simulate a registered user try to
// login into your app. This test case specifically test your login scenario,
// and to test that particular part means we need have a predefined data
// which is a verified account.
func (e *exampleTestSuite) TestSuccessLogin() {
	tt := new(successLoginTest)
	defer tt.clean(e)
	tt.createVerifiedUser(e)
	resp := tt.loginAPICall(e)
	tt.assertLoginSuccessful(e, resp)
}