Extract class and method

src/test/java/com/giangtester/api/DeleteStudent.java

@@ -0,0 +1,17 @@
+package com.giangtester.api;
+
+import com.giangtester.models.Student;
+import io.restassured.http.ContentType;
+import io.restassured.response.Response;
+
+import static io.restassured.RestAssured.given;
+
+public class DeleteStudent {
+
+    public Response deleteStudent(Student student) {
+        return given().log().all()
+                .contentType(ContentType.JSON)
+                .when()
+                .delete("/{id}", student.getId());
+    }
+}

src/test/java/com/giangtester/api/PostStudent.java

@@ -0,0 +1,19 @@
+package com.giangtester.api;
+
+import com.giangtester.models.Student;
+import io.restassured.http.ContentType;
+import io.restassured.response.Response;
+
+import static io.restassured.RestAssured.given;
+
+public class PostStudent {
+
+    public Response createAStudent(Student student) {
+        return given().log().all()
+                .contentType(ContentType.JSON)
+                .when()
+                .body(student)
+                .post();
+    }
+
+}

src/test/java/com/giangtester/api/PutStudent.java

@@ -0,0 +1,18 @@
+package com.giangtester.api;
+
+import com.giangtester.models.Student;
+import io.restassured.http.ContentType;
+import io.restassured.response.Response;
+
+import static io.restassured.RestAssured.given;
+
+public class PutStudent {
+
+    public Response updateStudent(Student student, String id) {
+        return given().log().all()
+                .contentType(ContentType.JSON)
+                .when()
+                .body(student)
+                .put("/{id}", id);
+    }
+}

src/test/java/com/giangtester/features/DELETEStudentTest.java

@@ -1,29 +1,28 @@
 package com.giangtester.features;
 
+import com.giangtester.api.DeleteStudent;
+import com.giangtester.api.PostStudent;
 import com.giangtester.base.BaseClass;
 import com.giangtester.models.Student;
-import io.restassured.http.ContentType;
 import io.restassured.response.Response;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import static io.restassured.RestAssured.given;
-
 public class DELETEStudentTest extends BaseClass {
 
-    @Test
-    void deleteAnExistingStudent() {
-        // Arrange: Setup data
-        Student student = Student.getInstance();
-        given().log().all().contentType(ContentType.JSON)
-                .when().body(student).post();
+    private Student student;
+    private final PostStudent postStudent = new PostStudent();
+    private final DeleteStudent deleteStudent = new DeleteStudent();
 
-        // Act: Call API delete student
-        Response res = given()
-                .contentType(ContentType.JSON)
-                .when()
-                .delete("/{id}", student.getId());
+    @BeforeEach
+    void createStudent() {
+        student = Student.getInstance();
+        postStudent.createAStudent(student);
+    }
 
-        // Assert
+    @Test
+    void deleteAnExistingStudent() {
+        Response res = deleteStudent.deleteStudent(student);
         res.then().statusCode(204);
     }
 }

src/test/java/com/giangtester/features/GETListStudentTest.java

@@ -14,12 +14,13 @@ class GETListStudentTest extends BaseClass {
     @Test
     public void getListStudent() {
         Response res = getStudent.getListStudent();
+        res.prettyPrint();
         res.then().statusCode(200);
     }
 
     @Test
-    public void getFirstStudent() {
-        Response res = getStudent.getListStudentById("1");
-        res.then().statusCode(200).body("email", equalTo("adalberto.glover@yahoo.com"));
+    public void getSecondStudent() {
+        Response res = getStudent.getListStudentById("2");
+        res.then().statusCode(200).body("email", equalTo("faucibus.orci.luctus@Duisac.net"));
     }
 }

src/test/java/com/giangtester/features/POSTNewStudentTest.java

@@ -1,39 +1,27 @@
 package com.giangtester.features;
 
+import com.giangtester.api.PostStudent;
 import com.giangtester.base.BaseClass;
 import com.giangtester.models.Student;
-import io.restassured.http.ContentType;
 import io.restassured.response.Response;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.util.ArrayList;
-import java.util.List;
-
-import static io.restassured.RestAssured.given;
 import static org.hamcrest.Matchers.equalTo;
 
 public class POSTNewStudentTest extends BaseClass {
 
-    @Test
-    void postNewStudent() {
-        List<String> courses = new ArrayList<>();
-        courses.add("Math");
-        courses.add("Economics");
+    private Student student;
+    private final PostStudent postStudent = new PostStudent();
 
-        Student student = Student.getInstance();
-        student.setId(101);
-        student.setFirstName("Giang");
-        student.setLastName("Nguyen");
-        student.setEmail("giang.nguyen@gc.com");
-        student.setProgramme("Computer Science");
-        student.setCourses(courses);
+    @BeforeEach
+    void createStudent() {
+        student = Student.getInstance();
+    }
 
-        Response res = given()
-                .contentType(ContentType.JSON)
-                .when()
-                .body(student)
-                .post();
-        //res.prettyPrint();
+    @Test
+    void postNewStudent() {
+        Response res = postStudent.createAStudent(student);
         res.then().statusCode(201).body("msg", equalTo("Student added"));
     }
 }

src/test/java/com/giangtester/features/PUTStudentTest.java

@@ -1,35 +1,38 @@
 package com.giangtester.features;
 
+import com.giangtester.api.GetStudent;
+import com.giangtester.api.PutStudent;
 import com.giangtester.base.BaseClass;
 import com.giangtester.models.Student;
-import io.restassured.http.ContentType;
 import io.restassured.path.json.JsonPath;
 import io.restassured.response.Response;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import java.util.List;
 
-import static io.restassured.RestAssured.given;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.equalTo;
 
 public class PUTStudentTest extends BaseClass {
 
+    private Student student;
+    private final PutStudent putStudent = new PutStudent();
+    private final GetStudent getStudent = new GetStudent();
+
+    @BeforeEach
+    void createStudent() {
+        student = Student.getInstance();
+    }
+
     @Test
     void changeInformationOfAnExistingStudent() {
-        Student student = Student.getInstance();
         student.setFirstName("Giang");
 
-        Response res = given()
-                .contentType(ContentType.JSON)
-                .when()
-                .body(student)
-                .put("/1");
-
-        res.prettyPrint();
+        Response res = putStudent.updateStudent(student, "1");
         res.then().statusCode(200).body("msg", equalTo("Student Updated"));
 
-        JsonPath jsonPath = given().when().get("/list").then().extract().body().jsonPath();
+        JsonPath jsonPath = getStudent.getListStudent().then().extract().body().jsonPath();
         List<Student> students = jsonPath.getList("", Student.class);
         assertThat(students.get(0).getFirstName(), equalTo("Giang"));
     }