Problem with tests

pom.xml

@@ -24,30 +24,38 @@
 		<java.version>11</java.version>
 	</properties>
 
-	<dependencies>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-data-jpa</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-web</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-validation</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.postgresql</groupId>
-			<artifactId>postgresql</artifactId>
-			<scope>runtime</scope>
-		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-test</artifactId>
-			<scope>test</scope>
-		</dependency>
-	</dependencies>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+
+    </dependencies>
 
 	<build>
 		<plugins>
@@ -58,5 +66,4 @@
 		</plugins>
 	</build>
 
-
 </project>

src/test/java/com/example/postgresdemo/controller/QuestionControllerTest.java

@@ -0,0 +1,183 @@
+package com.example.postgresdemo.controller;
+
+import com.example.postgresdemo.model.Question;
+import com.example.postgresdemo.repository.QuestionRepository;
+
+import org.hamcrest.Matchers;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
+
+
+import java.nio.CharBuffer;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+
+@AutoConfigureMockMvc
+public class QuestionControllerTest {
+    @Autowired
+    private QuestionRepository questionRepository;
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @AfterEach
+    void deleteQuestions() {
+        questionRepository.deleteAll();
+    }
+
+    @Test
+    void testGetQuestionsWithAmountLessThanPageSize() throws Exception {
+        int assertionNumber = 10;
+        int pageSize = 20;
+
+        fillQuestions(assertionNumber);
+
+        mockMvc.perform(get("/questions")
+                        .contentType(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.content.length()", Matchers.equalTo(assertionNumber)))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.totalElements", Matchers.equalTo(assertionNumber)))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.totalPages", Matchers.equalTo(1)));
+    }
+
+    @Test
+    void testGetQuestionsWithAmountMoreThanPageSize() throws Exception {
+        int assertionNumber = 30;
+        int pageSize = 20;
+        int totalPages = (int) Math.ceil(assertionNumber / (double) pageSize);
+
+        fillQuestions(assertionNumber);
+
+        mockMvc.perform(get("/questions")
+                        .contentType(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.content.length()", Matchers.equalTo(pageSize)))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.totalElements", Matchers.equalTo(assertionNumber)))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.totalPages", Matchers.equalTo(totalPages)));
+    }
+
+    @Test
+    void testCreateCorrectQuestion() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.post("/questions")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"title\": \"Question 1\",\n" +
+                                "    \"description\": \"Description 1\"\n" +
+                                "}"))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.title", Matchers.equalTo("Question 1")))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.description", Matchers.equalTo("Description 1")));
+    }
+
+    @Test
+    void testCreateQuestionWithoutTitle() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.post("/questions")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"description\": \"Description\"\n" +
+                                "}"))
+                .andExpect(status().is4xxClientError());
+    }
+
+    @Test
+    void testCreateQuestionWithTitleLesThenThreeChars() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.post("/questions")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"title\": \"Te\",\n" +
+                                "    \"description\": \"Description\"\n" +
+                                "}"))
+                .andExpect(status().is4xxClientError());
+    }
+
+    @Test
+    void testCreateQuestionWithTitleMoreThenHundredChars() throws Exception {
+        int numberOfChars = 101;
+        String title = CharBuffer.allocate(numberOfChars).toString().replace('\0', 'T');
+
+        mockMvc.perform(MockMvcRequestBuilders.post("/questions")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"title\": \"" + title + "\",\n" +
+                                "    \"description\": \"Description\"\n" +
+                                "}"))
+                .andExpect(status().is4xxClientError());
+    }
+
+    @Test
+    void testCreateQuestionWithoutDescription() throws Exception {
+        mockMvc.perform(MockMvcRequestBuilders.post("/questions")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"title\": \"Question 1\"\n" +
+                                "}"))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.title", Matchers.equalTo("Question 1")))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.description", Matchers.equalTo(null)));
+    }
+
+    @Test
+    void testUpdateQuestion() throws Exception {
+        fillQuestions(1);
+        long questionId = questionRepository.findAll().get(0).getId();
+
+        mockMvc.perform(MockMvcRequestBuilders.put("/questions/" + questionId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"title\": \"Edited Question 1\",\n" +
+                                "    \"description\": \"Edited Description 1\"\n" +
+                                "}"))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.title", Matchers.equalTo("Edited Question 1")))
+                .andExpect(MockMvcResultMatchers.jsonPath("$.description", Matchers.equalTo("Edited Description 1")));
+    }
+
+    @Test
+    void testUpdateQuestionWithNonExistingId() throws Exception {
+        fillQuestions(1);
+        long questionId = questionRepository.findAll().get(0).getId();
+
+        mockMvc.perform(MockMvcRequestBuilders.put("/questions/" + (questionId + 1))
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\n" +
+                                "    \"title\": \"Edited Question 1\",\n" +
+                                "    \"description\": \"Edited Description 1\"\n" +
+                                "}"))
+                .andExpect(status().is4xxClientError());
+    }
+
+    @Test
+    void testDeleteQuestion() throws Exception {
+        fillQuestions(1);
+        long questionId = questionRepository.findAll().get(0).getId();
+
+        mockMvc.perform(MockMvcRequestBuilders.delete("/questions/" + questionId)
+                        .contentType(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk());
+    }
+
+    private void fillQuestions(Integer number) {
+        for (int i = 0; i < number; i++) {
+            Question question = new Question();
+            question.setTitle("Question " + i);
+            question.setDescription("Description " + i);
+            questionRepository.save(question);
+        }
+    }
+}

src/test/resources/application.properties

@@ -0,0 +1,14 @@
+spring.datasource.url=jdbc:h2:mem:test;MODE=PostgreSQL;
+spring.datasource.driver-class-name=org.h2.Driver
+spring.datasource.username=${DB_USER}
+spring.datasource.password=${DB_PASSWORD}
+# We add the MySQL Dialect so that it understands and generates the query based on MySQL
+spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
+
+spring.h2.console.enabled=true
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.properties.hibernate.format_sql=true
+#spring.jpa.properties.hibernate.show_sql=true
+
+
+spring.sql.init.mode=always