From eef7b45172bd26a28c8e7a023e360601a0bb00e8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=95=D1=80=D1=88=D0=BE=D0=B2=20=D0=92=D0=BB=D0=B0=D0=B4?=
 =?UTF-8?q?=D0=B8=D1=81=D0=BB=D0=B0=D0=B2?= <ershvladislav@gmail.com>
Date: Mon, 31 Aug 2026 21:28:16 +0700
Subject: [PATCH] test: add test class DataSourceReaderTest

---
 .../datasource/DataSourceReaderTest.java      | 116 ++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 app/src/test/java/ru/project/datasource/DataSourceReaderTest.java

diff --git a/app/src/test/java/ru/project/datasource/DataSourceReaderTest.java b/app/src/test/java/ru/project/datasource/DataSourceReaderTest.java
new file mode 100644
index 0000000..740904c
--- /dev/null
+++ b/app/src/test/java/ru/project/datasource/DataSourceReaderTest.java
@@ -0,0 +1,116 @@
+package ru.project.datasource;
+
+import java.io.UncheckedIOException;
+import java.util.NoSuchElementException;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.BeforeEach;
+
+import ru.project.collection.MyList;
+import ru.project.collection.MyLinkedList;
+
+import ru.project.student.Student;
+import ru.project.student.StudentBuilder;
+
+class DataSourceReaderTest{
+    private StudentCsvReader valideReader;
+    //Testing StudentCsvReader
+    @BeforeEach
+    void setUp(){
+        valideReader = new StudentCsvReader("C:\\Users\\Dexp\\TestData\\sample.csv");
+    }
+
+    @Test
+    void readerTestRejectRelativePath(){
+        assertThrows(IllegalArgumentException.class, () -> new StudentCsvReader("/Users/Dexp/TestData/sample.csv"));
+    }
+
+    @Test
+    void readerRejectPathIsDir(){
+        assertThrows(UncheckedIOException.class, () -> new StudentCsvReader("C:\\Users\\Dexp\\TestData"));
+    }
+
+    @Test
+    void readerTestFileNotExist(){
+        assertThrows(UncheckedIOException.class, () -> new StudentCsvReader("C:\\Users\\Dexp\\TestData\\sss.csv"));
+    }
+
+    @Test
+    void testSkipsHeader(){
+        Student student = valideReader.next();
+        assertTrue(!(student.getGroupNumber()=="groupNumber"));
+    }
+
+    @Test
+    void testCreationStudentOnValidData(){
+        Student student = valideReader.next();
+        assertEquals(student.getGroupNumber(), "A21");
+        assertEquals(student.getAverageGrade(), 5.0);
+        assertEquals(student.getRecordBookNumber(), 331);
+    }
+
+    @Test
+    void testNotSkippingFirstStudent(){
+        boolean hn = valideReader.hasNext();
+        hn = valideReader.hasNext();
+        Student student = valideReader.next();
+        assertEquals(student.getGroupNumber(), "A21");
+        assertEquals(student.getAverageGrade(), 5.0);
+        assertEquals(student.getRecordBookNumber(), 331);
+    }
+
+    @Test
+    void testValidEndsOfFile(){
+        Student student = valideReader.next();
+        student = valideReader.next();
+        assertTrue(!valideReader.hasNext());
+    }
+
+    @Test
+    void testOutOfIndex(){
+        assertThrows(NoSuchElementException.class, () -> {
+            Student student = valideReader.next();
+            student = valideReader.next();
+            student = valideReader.next();
+        });
+    }
+
+    @Test
+    void readerTestRejectFewParametres(){
+        assertThrows(IllegalArgumentException.class, () -> {
+            StudentCsvReader reader = new StudentCsvReader("C:\\Users\\Dexp\\TestData\\fewparameters.csv");
+            Student student = reader.next();
+        });
+    }
+
+    @Test
+    void readerTestRejectInvalidGroupNumber(){
+        assertThrows(IllegalArgumentException.class, () -> {
+            StudentCsvReader reader = new StudentCsvReader("C:\\Users\\Dexp\\TestData\\invalid_groupnumber.csv");
+            Student student = reader.next();
+        });
+    }
+
+    @Test
+    void readerTestRejectInvalidAverageGrade(){
+        assertThrows(IllegalArgumentException.class, () -> {
+            StudentCsvReader reader = new StudentCsvReader("C:\\Users\\Dexp\\TestData\\invalid_averagegrade.csv");
+            Student student = reader.next();
+        });
+    }
+
+    @Test
+    void readerTestRejectInvalidRecordBookNumber(){
+        assertThrows(IllegalArgumentException.class, () -> {
+            StudentCsvReader reader = new StudentCsvReader("C:\\Users\\Dexp\\TestData\\invalid_recordbooknumber.csv");
+            Student student = reader.next();
+        });
+    }
+}
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