Added find endpoint

src/main/java/net/tokishu/note/controller/NotesController.java

@@ -18,6 +18,11 @@ public class NotesController {
         return noteService.getAll();
     }
 
+    @GetMapping("/note/{id}")
+    public Note find(@PathVariable Long id){
+        return noteService.find(id);
+    }
+
     @PostMapping("/note")
     public Note add(@RequestBody Note note){
         return noteService.add(note);

src/main/java/net/tokishu/note/service/NoteService.java

@@ -1,7 +1,9 @@
 package net.tokishu.note.service;
 
 import net.tokishu.note.model.Note;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
+import org.springframework.web.server.ResponseStatusException;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -17,6 +19,16 @@ public class NoteService {
         return notes;
     }
 
+    public Note find(Long id) {
+        for (Note note : notes) {
+            if (note.getId().equals(id)) {
+                return note;
+            }
+        }
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Note not found");
+    }
+
+
     public Note add(Note note){
         note.setId(idGenerator.getAndIncrement());
         notes.add(note);

src/test/java/net/tokishu/note/service/NoteServiceTest.java

@@ -27,7 +27,7 @@ public class NoteServiceTest {
     }
 
     @Test
-    void updateNote() {
+    void updateNote(){
         Note note = new Note(1L, "Old QQ", "Old test content");
         noteService.add(note);
 
@@ -39,10 +39,25 @@ public class NoteServiceTest {
     }
 
     @Test
-    void deleteNote() {
-        noteService.add(new Note(1L, "Bye bye :(", "content"));
+    void deleteNote(){
+        Note noteToDelete = new Note(1L, "Bye bye :(", "content");
+        noteService.add(noteToDelete);
         noteService.delete(1L);
 
         assertTrue(noteService.getAll().isEmpty());
     }
+
+    @Test
+    void findNote(){
+
+        for (long i = 1; i <= 10; i++) {
+            Note note = new Note(i, "Note " + i, "Content for note №" + i);
+            noteService.add(note);
+        }
+
+        Note result = noteService.find(5L);
+
+        assertNotNull(result, "Note should be found");
+        assertEquals("Note 5", result.getName());
+    }
 }