test(student): add JUnit tests

app/src/test/java/ru/project/student/StudentTest.java

@@ -0,0 +1,168 @@
+package ru.project.student;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+
+class StudentTest {
+    @Test
+    void shouldCreateValidStudent() {
+        Student student = new StudentBuilder()
+                .setGroupNumber("101")
+                .setAverageGrade(4.5)
+                .setRecordBookNumber("12345")
+                .build();
+
+        assertEquals("101", student.getGroupNumber());
+        assertEquals(4.5, student.getAverageGrade());
+        assertEquals("12345", student.getRecordBookNumber());
+    }
+
+    @Test
+    void shouldThrowExceptionWhenGroupNumberIsEmpty() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("")
+                    .setAverageGrade(4.5)
+                    .setRecordBookNumber("12345")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldThrowExceptionWhenAverageGradeIsGreaterThanFive() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("101")
+                    .setAverageGrade(6.0)
+                    .setRecordBookNumber("12345")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldThrowExceptionWhenAverageGradeIsLessThanZero() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("101")
+                    .setAverageGrade(-1.0)
+                    .setRecordBookNumber("12345")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldCreateStudentWhenAverageGradeIsZero() {
+        Student student = new StudentBuilder()
+                .setGroupNumber("101")
+                .setAverageGrade(0.0)
+                .setRecordBookNumber("12345")
+                .build();
+
+        assertEquals(0.0, student.getAverageGrade());
+    }
+
+    @Test
+    void shouldCreateStudentWhenAverageGradeIsFive() {
+        Student student = new StudentBuilder()
+                .setGroupNumber("101")
+                .setAverageGrade(5.0)
+                .setRecordBookNumber("12345")
+                .build();
+
+        assertEquals(5.0, student.getAverageGrade());
+    }
+
+    @Test
+    void shouldThrowExceptionWhenRecordBookNumberIsEmpty() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("101")
+                    .setAverageGrade(4.5)
+                    .setRecordBookNumber("")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldThrowExceptionWhenGroupNumberIsNull() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber(null)
+                    .setAverageGrade(4.5)
+                    .setRecordBookNumber("12345")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldThrowExceptionWhenGroupNumberIsBlank() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("   ")
+                    .setAverageGrade(4.5)
+                    .setRecordBookNumber("12345")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldThrowExceptionWhenRecordBookNumberIsNull() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("101")
+                    .setAverageGrade(4.5)
+                    .setRecordBookNumber(null)
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldThrowExceptionWhenRecordBookNumberIsBlank() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new StudentBuilder()
+                    .setGroupNumber("101")
+                    .setAverageGrade(4.5)
+                    .setRecordBookNumber("   ")
+                    .build();
+        });
+    }
+
+    @Test
+    void shouldReturnTrueWhenStudentsAreEqual() {
+        Student student1 = new StudentBuilder()
+                .setGroupNumber("101")
+                .setAverageGrade(4.5)
+                .setRecordBookNumber("12345")
+                .build();
+
+        Student student2 = new StudentBuilder()
+                .setGroupNumber("101")
+                .setAverageGrade(4.5)
+                .setRecordBookNumber("12345")
+                .build();
+
+        assertEquals(student1, student2);
+        assertEquals(student1.hashCode(), student2.hashCode());
+    }
+
+    @Test
+    void shouldReturnFalseWhenStudentsAreDifferent() {
+        Student student1 = new StudentBuilder()
+                .setGroupNumber("101")
+                .setAverageGrade(4.5)
+                .setRecordBookNumber("12345")
+                .build();
+
+        Student student2 = new StudentBuilder()
+                .setGroupNumber("102")
+                .setAverageGrade(4.5)
+                .setRecordBookNumber("12345")
+                .build();
+
+        assertNotEquals(student1, student2);
+    }
+}

app/src/test/java/ru/project/student/StudentText.java

@@ -1,4 +0,0 @@
-package ru.project.student;
-
-public class StudentText {
-}