recipes2/internal/http-server/handlers/recipes/recipes_test.go

package recipes_test

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"recipes/internal/domain/models"
	"recipes/internal/http-server/handlers/recipes"
	"recipes/internal/http-server/handlers/recipes/mocks"
	"recipes/internal/lib/logger/handlers/slogdiscard"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestGetRecipesHandler(t *testing.T) {
	// cases
	cases := []struct {
		name             string          // name of test
		page             uint            // number of page to get
		inputBody        string          // input json
		wantBody         string          // expected output json
		wantRespError    string          // expected error
		wantRespStatus   string          // expected status
		storageMockError error           // mock error to return
		storageTimes     int             // count of storage calls
		recipes          []models.Recipe // returned data
	}{
		{
			name:           "Success",
			page:           1,
			inputBody:      `{"page": 1}`,
			wantBody:       "{\"status\":\"OK\",\"recipes\":[{\"id\":1,\"title\":\"title 1\",\"img\":\"1.jpg\",\"ctime\":\"1 час\",\"cal\":\"100 kCal\"},{\"id\":2,\"title\":\"title 2\",\"img\":\"2.jpg\",\"ctime\":\"2 часа\",\"cal\":\"200 kCal\"}]}\n",
			wantRespStatus: "OK",
			storageTimes:   1,
			recipes: []models.Recipe{
				{
					ID:          1,
					Title:       "title 1",
					Image:       "1.jpg",
					CookingTime: "1 час",
					Calories:    "100 kCal",
				},
				{
					ID:          2,
					Title:       "title 2",
					Image:       "2.jpg",
					CookingTime: "2 часа",
					Calories:    "200 kCal",
				},
			},
		},
		{
			name:           "Empty page",
			page:           10,
			inputBody:      `{"page": 10}`,
			wantBody:       "{\"status\":\"OK\",\"recipes\":null}\n",
			wantRespStatus: "OK",
			storageTimes:   1,
		},
		{
			name:           "Bad data",
			inputBody:      `{"page": 0}`,
			wantBody:       "{\"status\":\"Error\",\"error\":\"field Page is a required field\"}\n",
			wantRespStatus: "Error",
			wantRespError:  "field Page is a required field",
			storageTimes:   0,
		},
		{
			name:           "Broken JSON",
			inputBody:      `{"page" 1}`,
			wantBody:       "{\"status\":\"Error\",\"error\":\"failed to decode request\"}\n",
			wantRespError:  "failed to decode request",
			wantRespStatus: "Error",
			storageTimes:   0,
		},
		{
			name:             "Storage error",
			inputBody:        `{"page": 1}`,
			page:             1,
			wantBody:         "{\"status\":\"Error\",\"error\":\"failed to get recipes\"}\n",
			wantRespError:    "failed to get recipes",
			wantRespStatus:   "Error",
			storageMockError: errors.New("SOME ERROR"),
			storageTimes:     1,
		},
	}

	for _, tc := range cases {
		tc := tc

		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			// create storage mock
			recipeProviderMock := mocks.NewRecipesProvider(t)
			if tc.storageTimes > 0 {
				recipeProviderMock.On("GetRecipes", context.Background(), recipes.GetRecipesLimit*(int(tc.page)-1), recipes.GetRecipesLimit).Return(tc.recipes, tc.storageMockError).Times(tc.storageTimes)
			}
			// create handler
			handler := recipes.New(slogdiscard.NewDiscardLogger(), recipeProviderMock)
			// http request
			req, err := http.NewRequest(http.MethodGet, "/recipes_page", bytes.NewReader([]byte(tc.inputBody)))
			require.NoError(t, err)
			// create request
			rr := httptest.NewRecorder()
			handler.ServeHTTP(rr, req)
			// compare expected and actual
			assert.Equal(t, http.StatusOK, rr.Code)

			body := rr.Body.String()
			assert.Equal(t, tc.wantBody, body)

			var resp recipes.Response
			require.NoError(t, json.Unmarshal([]byte(body), &resp))
			assert.Equal(t, tc.wantRespError, resp.Error)
			assert.Equal(t, tc.wantRespStatus, resp.Status)
			assert.Equal(t, tc.recipes, resp.Recipes)
		})
	}
}