diff --git a/app/src/test/java/ru/project/student/StudentTest1.java b/app/src/test/java/ru/project/student/StudentTest1.java
new file mode 100644
index 0000000..cdce6d8
--- /dev/null
+++ b/app/src/test/java/ru/project/student/StudentTest1.java
@@ -0,0 +1,139 @@
+package ru.project.student;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class StudentTest {
+
+    @Test
+    void testValidStudentCreation() {
+        Student student = new Student("A12", 4.5, 12345);
+        assertEquals("A12", student.getGroupNumber());
+        assertEquals(4.5, student.getAverageGrade());
+        assertEquals(12345, student.getRecordBookNumber());
+    }
+
+    @Test
+    void testValidGroupNumbers() {
+        assertDoesNotThrow(() -> new Student("A12", 4.5, 1));
+        assertDoesNotThrow(() -> new Student("B32", 4.5, 1));
+        assertDoesNotThrow(() -> new Student("Z00", 4.5, 1));
+    }
+
+    @Test
+    void testInvalidGroupNumbers() {
+        assertThrows(IllegalArgumentException.class, () -> new Student("a12", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("A1", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("A123", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("AA1", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("а1А", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("аа!!а123", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("23фи!12", 4.5, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("№№###*()", 4.5, 1));
+    }
+
+    @Test
+    void testValidAverageGrades() {
+        assertDoesNotThrow(() -> new Student("A12", 0.0, 1));
+        assertDoesNotThrow(() -> new Student("A12", 5.0, 1));
+    }
+
+    @Test
+    void testInvalidAverageGrades() {
+        assertThrows(IllegalArgumentException.class, () -> new Student("A12", -1.0, 1));
+        assertThrows(IllegalArgumentException.class, () -> new Student("A12", 6.0, 1));
+    }
+
+    @Test
+    void testValidRecordBookNumbers() {
+        assertDoesNotThrow(() -> new Student("A12", 4.5, 1));
+        assertDoesNotThrow(() -> new Student("A12", 4.5, 12345));
+    }
+
+    @Test
+    void testInvalidRecordBookNumbers() {
+        assertThrows(IllegalArgumentException.class, () -> new Student("A12", 4.5, 0));
+        assertThrows(IllegalArgumentException.class, () -> new Student("A12", 4.5, -1));
+    }
+
+    @Test
+    void testWithGroupNumber() {
+        Student original = new Student("A12", 4.5, 12345);
+        Student updated = original.withGroupNumber("B32");
+
+        assertNotSame(original, updated);
+        assertEquals("B32", updated.getGroupNumber());
+        assertEquals(4.5, updated.getAverageGrade());
+        assertEquals(12345, updated.getRecordBookNumber());
+
+        assertEquals("A12", original.getGroupNumber());
+    }
+
+    @Test
+    void testWithAverageGrade() {
+        Student original = new Student("A12", 4.5, 12345);
+        Student updated = original.withAverageGrade(4.8);
+
+        assertNotSame(original, updated);
+        assertEquals(4.8, updated.getAverageGrade());
+        assertEquals("A12", updated.getGroupNumber());
+        assertEquals(12345, updated.getRecordBookNumber());
+
+        assertEquals(4.5, original.getAverageGrade());
+    }
+
+    @Test
+    void testWithRecordBookNumber() {
+        Student original = new Student("A12", 4.5, 12345);
+        Student updated = original.withRecordBookNumber(99999);
+
+        assertNotSame(original, updated);
+        assertEquals(99999, updated.getRecordBookNumber());
+        assertEquals("A12", updated.getGroupNumber());
+        assertEquals(4.5, updated.getAverageGrade());
+
+        assertEquals(12345, original.getRecordBookNumber());
+    }
+
+    @Test
+    void testWithInvalidGroupNumber() {
+        Student original = new Student("A12", 4.5, 12345);
+        assertThrows(IllegalArgumentException.class,
+                () -> original.withGroupNumber("a12"));
+        assertEquals("A12", original.getGroupNumber()); // не изменился
+    }
+
+    @Test
+    void testWithInvalidAverageGrade() {
+        Student original = new Student("A12", 4.5, 12345);
+        assertThrows(IllegalArgumentException.class,
+                () -> original.withAverageGrade(6.0));
+        assertEquals(4.5, original.getAverageGrade());
+    }
+
+    @Test
+    void testWithInvalidRecordBookNumber() {
+        Student original = new Student("A12", 4.5, 12345);
+        assertThrows(IllegalArgumentException.class,
+                () -> original.withRecordBookNumber(0));
+        assertEquals(12345, original.getRecordBookNumber());
+    }
+
+    @Test
+    void testEqualsAndHashCode() {
+        Student s1 = new Student("A12", 4.5, 12345);
+        Student s2 = new Student("A12", 4.5, 12345);
+        Student s3 = new Student("B32", 4.5, 12345);
+        Student s4 = new Student("A12", 4.8, 12345);
+        Student s5 = new Student("A12", 4.5, 99999);
+
+        assertEquals(s1, s2);
+        assertEquals(s1.hashCode(), s2.hashCode());
+
+        assertNotEquals(s1, s3);
+        assertNotEquals(s1, s4);
+        assertNotEquals(s1, s5);
+        assertNotEquals(s1, null);
+        assertNotEquals(s1, "some string");
+    }
+}
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