spring-boot-realworld-example-app/src/test/java/io/spring/api/UsersApiTest.java

package io.spring.api;

import io.restassured.RestAssured;
import io.spring.application.JwtService;
import io.spring.application.user.UserData;
import io.spring.application.user.UserReadService;
import io.spring.core.user.User;
import io.spring.core.user.UserRepository;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.context.embedded.LocalServerPort;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import static io.restassured.RestAssured.given;
import static org.hamcrest.core.IsEqual.equalTo;
import static org.junit.Assert.*;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@RunWith(SpringRunner.class)
public class UsersApiTest {
    @LocalServerPort
    private int port;

    @MockBean
    private UserRepository userRepository;

    @MockBean
    private JwtService jwtService;

    @MockBean
    private UserReadService userReadService;


    @Before
    public void setUp() throws Exception {
        RestAssured.port = port;
    }

    @Test
    public void should_create_user_success() throws Exception {
        String email = "john@jacob.com";
        String username = "johnjacob";

        when(jwtService.toToken(any())).thenReturn("123");
        UserData userData = new UserData(email, username, "", "https://static.productionready.io/images/smiley-cyrus.jpg");
        when(userReadService.findOne(eq(username))).thenReturn(userData);

        Map<String, Object> param = new HashMap<String, Object>() {{
            put("user", new HashMap<String, Object>() {{
                put("email", email);
                put("password", "johnnyjacob");
                put("username", username);
            }});
        }};

        given()
            .contentType("application/json")
            .body(param)
            .when()
            .post("/users")
            .then()
            .statusCode(201)
            .body("user.email", equalTo(email))
            .body("user.username", equalTo(username))
            .body("user.bio", equalTo(""))
            .body("user.image", equalTo("https://static.productionready.io/images/smiley-cyrus.jpg"))
            .body("user.token", equalTo("123"));

        verify(userRepository).save(any());
    }

    @Test
    public void should_show_error_message_for_blank_username() throws Exception {

        String email = "john@jacob.com";
        String username = "";

        Map<String, Object> param = new HashMap<String, Object>() {{
            put("user", new HashMap<String, Object>() {{
                put("email", email);
                put("password", "johnnyjacob");
                put("username", username);
            }});
        }};

        given()
            .contentType("application/json")
            .body(param)
            .when()
            .post("/users")
            .then()
            .statusCode(422)
            .body("errors.username[0]", equalTo("can't be empty"));
    }

    @Test
    public void should_show_error_message_for_invalid_email() throws Exception {
        String email = "johnxjacob.com";
        String username = "johnjacob";

        Map<String, Object> param = new HashMap<String, Object>() {{
            put("user", new HashMap<String, Object>() {{
                put("email", email);
                put("password", "johnnyjacob");
                put("username", username);
            }});
        }};

        given()
            .contentType("application/json")
            .body(param)
            .when()
            .post("/users")
            .then()
            .statusCode(422)
            .body("errors.email[0]", equalTo("should be an email"));

    }

    @Test
    public void should_show_error_for_duplicated_username() throws Exception {
        String email = "john@jacob.com";
        String username = "johnjacob";

        when(userRepository.findByUsername(eq(username))).thenReturn(Optional.of(new User(
            email, username, "123", "bio", ""
        )));

        Map<String, Object> param = new HashMap<String, Object>() {{
            put("user", new HashMap<String, Object>() {{
                put("email", email);
                put("password", "johnnyjacob");
                put("username", username);
            }});
        }};

        given()
            .contentType("application/json")
            .body(param)
            .when()
            .post("/users")
            .then()
            .statusCode(422)
            .body("errors.username[0]", equalTo("duplicated username"));
    }

    @Test
    public void should_show_error_for_duplicated_email() throws Exception {
        String email = "john@jacob.com";
        String username = "johnjacob2";

        when(userRepository.findByEmail(eq(email))).thenReturn(Optional.of(new User(
            email, username, "123", "bio", ""
        )));

        when(userRepository.findByUsername(eq(username))).thenReturn(Optional.empty());

        Map<String, Object> param = new HashMap<String, Object>() {{
            put("user", new HashMap<String, Object>() {{
                put("email", email);
                put("password", "johnnyjacob");
                put("username", username);
            }});
        }};

        given()
            .contentType("application/json")
            .body(param)
            .when()
            .post("/users")
            .then()
            .statusCode(422)
            .body("errors.email[0]", equalTo("duplicated email"));
    }
}