diff --git a/.gitignore b/.gitignore
index 2d3323b..c49ac75 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,13 @@
 *.bin
 *.elf
 *.dSYM
-tools/mkfs
+tools/*
+!tools/*.*
+
+user/*
+!user/*.*
+user/*.o
+
+.idea
+__pycache__
+res.txt
diff --git a/Makefile b/Makefile
index 264379a..6a758c8 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ endif
 CFLAGS = -fno-pic -ffreestanding -static -fno-builtin -fno-strict-aliasing \
 		 -mno-sse \
 		 -I. \
-		 -Wall -ggdb -m32 -Werror -fno-omit-frame-pointer
+		 -Wall -ggdb -m32 -Werror -fno-omit-frame-pointer -Os
 CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
 ASMFLAGS = -m32 -ffreestanding -c -g -I.
 
@@ -43,10 +43,16 @@ OBJECTS = ./kernel/kstart.o ./kernel.o ./console.o ./drivers/vga.o ./drivers/uar
 	./fs/fs.o ./drivers/ata.o ./lib/string.o ./proc.o ./drivers/pit.o ./kernel/vm.o
 
 run: image.bin
-	qemu-system-i386 -drive format=raw,file=$< -serial mon:stdio
+	qemu-system-i386 -drive format=raw,file=$< -serial mon:stdio -qmp unix:qemu-monitor-socket,server,nowait
 
 run-nox: image.bin
-	qemu-system-i386 -nographic -drive format=raw,file=$< -serial mon:stdio
+	qemu-system-i386 -nographic -drive format=raw,file=$< -serial mon:stdio -qmp unix:qemu-monitor-socket,server,nowait
+
+test: tests.py
+	python3 tests.py --nox
+
+test-x: tests.py
+	python3 tests.py
 
 ejudge.sh: image.bin
 	echo >$@ "#!/bin/sh"
diff --git a/tests.py b/tests.py
new file mode 100644
index 0000000..7f6f1ad
--- /dev/null
+++ b/tests.py
@@ -0,0 +1,473 @@
+import os
+import unittest
+import sys
+import qemu.qmp
+import signal
+import asyncio
+
+
+class Tests(unittest.IsolatedAsyncioTestCase):
+    res_score = 0
+
+    class Qemu:
+        def __init__(self):
+            self.p: asyncio.subprocess.Process | None = None
+            self.client: qemu.qmp.QMPClient | None = None
+
+        async def __aenter__(self):
+            self.p = await asyncio.create_subprocess_exec('make', 'run-nox' if sys.argv[-1] == '--nox' else 'run')
+            while not os.path.exists('qemu-monitor-socket'):
+                await asyncio.sleep(0.01)
+            self.client = qemu.qmp.QMPClient('yabloko')
+            await self.client.connect('qemu-monitor-socket')
+            await asyncio.sleep(1)  # Time to init OS
+            return self
+
+        async def __aexit__(self, exc_type, exc_val, exc_tb):
+            await asyncio.sleep(1)
+            try:
+                await self.client.disconnect()
+            except EOFError:
+                pass
+            if self.p is None:
+                raise RuntimeError("Unexpected")
+            try:
+                os.kill(self.p.pid, signal.SIGTERM)
+            except:
+                pass
+            await self.p.wait()
+
+        async def key_press(self, keys: str, ms: int = 50):
+            res = await self.client.execute('send-key', {
+                'keys': [{"type": "qcode", "data": key} for key in keys.split('-')],
+                'hold-time': ms
+            })
+            await asyncio.sleep(ms / 1000)
+            return res
+
+        async def key_press_release(self, seq: list[str]):
+            # Auto release all pressed keys.
+            seq = seq.copy()
+            pressed = set()
+            for key in seq:
+                if key[0] == '-':
+                    if key[1:] not in pressed:
+                        raise RuntimeError("Internal error: key release before press " + key)
+                    pressed.remove(key[1:])
+                else:
+                    if key in pressed:
+                        raise RuntimeError("Internal error: double key press " + key)
+                    pressed.add(key)
+            for key in pressed:
+                seq.append('-' + key)
+
+            for key in seq:
+                await self.client.execute('input-send-event', {
+                    'events': [
+                        {'type': 'key', 'data': {
+                            'down': not key[0] == '-',
+                            'key': {"type": "qcode", "data": key.lstrip('-')},
+                        }}
+                    ]
+                })
+                await asyncio.sleep(50 / 1000)
+
+        async def run(self, name: str):
+            await self.key_press('r')
+            await self.key_press('u')
+            await self.key_press('n')
+            await self.key_press('spc')
+            for c in name:
+                await self.key_press(c)
+            await self.key_press('ret')
+
+        async def dump_screen(self) -> bytes:
+            if os.path.exists('mem.bin'):
+                p = await asyncio.create_subprocess_exec('rm', '-rf', 'mem.bin')
+                await p.wait()
+
+            # Скорость оставляет желать лучшего
+            await asyncio.sleep(1)
+
+            await self.client.execute('pmemsave', {
+                'val': 0xb8000,
+                'size': 25 * 80 * 2,
+                'filename': 'mem.bin',
+            })
+            await asyncio.sleep(0.1)
+            with open('mem.bin', 'rb') as f:
+                return f.read()
+
+    @classmethod
+    def tearDownClass(cls):
+        print()
+        print('Score:', cls.res_score)
+        with open('res.txt', 'w') as f:
+            f.write(str(cls.res_score))
+
+    @staticmethod
+    def score(score):
+        def decorator(func):
+            async def inner(self, *args, **kwargs):
+                print("Start test", func)
+                try:
+                    res = await func(self, *args, **kwargs)
+                except Exception as e:
+                    raise
+                else:
+                    Tests.res_score += score
+                    return res
+            return inner
+        return decorator
+
+    def check_screen_content(self, dump: bytes, lines: list[str]):
+        dump = dump[:79*2] + b' \x07' + dump[80*2:]  # ignore arrow
+
+        self.assertEqual(len(dump), 2 * 80 * 25)
+        for i in range(25):
+            for j in range(80):
+                self.assertEqual(dump[(j + i * 80) * 2 + 1], 0x07)
+
+            cur_line = b''.join(chr(dump[(j + i * 80) * 2]).encode() for j in range(80))
+
+            line = lines[i].encode() if i < len(lines) else b''
+            line = line.ljust(80, b' ')
+
+            self.assertEqual(line, cur_line)
+
+    @score(10)
+    async def test_halt(self):
+        async with Tests.Qemu() as q:
+
+            await q.key_press('h')
+            await q.key_press('a')
+            await q.key_press('l')
+            await q.key_press('t')
+            await q.key_press('ret')
+
+        self.assertEqual(q.p.returncode, 0)
+
+    @score(20)
+    async def _test_shift(self):
+        async with Tests.Qemu() as q:
+
+            await q.key_press('a')
+            await q.key_press('b')
+            await q.key_press('c')
+
+            await q.key_press('shift-a')
+            await q.key_press('shift-b')
+            await q.key_press('shift-c')
+
+            await q.key_press('shift-a-b-c')
+
+            await q.key_press('ret')
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> abcABCABC',
+                'unknown command, try: halt | run CMD',
+                '>',
+            ])
+
+        async with Tests.Qemu() as q:
+
+            await q.key_press('shift-shift_r-a')
+            await q.key_press('a')
+
+            await q.key_press('shift_r-shift-b')
+            await q.key_press('b')
+
+            await q.key_press('shift_r-c')
+            await q.key_press('c')
+
+            await q.key_press('ret')
+
+            await asyncio.sleep(1)
+
+            await q.key_press_release(['a', '-a'])
+            await q.key_press('b')
+
+            await q.key_press('ret')
+
+            await asyncio.sleep(1)
+
+            await q.key_press_release(['shift', 'a', '-a', '-shift'])
+            await q.key_press('b')
+            await q.key_press_release(['shift', 'a', '-shift', '-a'])
+            await q.key_press('b')
+            await q.key_press_release(['shift', 'shift_r', 'a', '-a', '-shift', 'a'])
+            await q.key_press('b')
+            await q.key_press_release(['shift', 'shift_r', 'a', '-a', '-shift_r', 'a'])
+            await q.key_press('b')
+            await q.key_press_release(['shift_r', 'shift', 'a', '-a', '-shift', 'a'])
+            await q.key_press('b')
+            await q.key_press_release(['shift_r', 'shift', 'a', '-a', '-shift_r', 'a'])
+            await q.key_press('b')
+
+            await asyncio.sleep(1)
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> AaBbCc',
+                'unknown command, try: halt | run CMD',
+                '> ab',
+                'unknown command, try: halt | run CMD',
+                '> AbAbAAbAAbAAbAAb',
+            ])
+
+        async with Tests.Qemu() as q:
+            keys = '0123456789' + ''.join(chr(i) for i in range(ord('a'), ord('z') + 1))
+
+            for key in keys:
+                await q.key_press(key)
+
+            await q.key_press('ret')
+
+            await asyncio.sleep(5)
+
+            for key in keys:
+                await q.key_press(f'shift-{key}')
+
+            await q.key_press('ret')
+
+            await asyncio.sleep(5)
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> 0123456789abcdefghijklmnopqrstuvwxyz',
+                'unknown command, try: halt | run CMD',
+                '> )!@#$%^&*(ABCDEFGHIJKLMNOPQRSTUVWXYZ',
+                'unknown command, try: halt | run CMD',
+                '>',
+            ])
+
+    @score(20)
+    async def _test_backspace(self):
+        async with Tests.Qemu() as q:
+
+            await q.key_press('a')
+            await q.key_press('b')
+            await q.key_press('c')
+
+            await q.key_press('backspace')
+
+            await q.key_press('d')
+
+            await q.key_press('ret')
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> abd',
+                'unknown command, try: halt | run CMD',
+                '>',
+            ])
+
+        async with Tests.Qemu() as q:
+            await q.key_press('backspace')
+            await q.key_press('backspace')
+
+            await q.key_press('a')
+            await q.key_press('b')
+            await q.key_press('c')
+
+            await q.key_press('backspace')
+            await q.key_press('backspace')
+
+            await q.key_press('a')
+            await q.key_press('b')
+            await q.key_press('c')
+
+            await q.key_press('backspace')
+            await q.key_press('backspace')
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> aa',
+            ])
+
+            await q.key_press('backspace')
+            await q.key_press('backspace')
+            await q.key_press('backspace')
+            await q.key_press('backspace')
+
+            await q.key_press('ret')
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> ',
+                'unknown command, try: halt | run CMD',
+                '>',
+            ])
+
+    @score(20)
+    async def _test_spin(self):
+        async with Tests.Qemu() as q:
+            found = set()
+
+            for i in range(10):
+                dump = await q.dump_screen()
+
+                self.assertEqual(dump[79*2+1], 15)
+                self.assertIn(dump[79*2], [0x18 + i for i in range(4)] + [ord('/'), ord('\\')])
+
+                found.add(dump[79*2])
+
+                self.check_screen_content(dump, [
+                    'YABLOKO',
+                    '',
+                    '>',
+                ])
+
+            self.assertGreaterEqual(len(found), 3)
+
+    @score(60)
+    async def _test_bss(self):
+        async with Tests.Qemu() as q:
+
+            await q.run('greet')
+
+            await q.run('bss')
+
+            await q.run('bss')
+
+            await q.run('greet')
+
+            await asyncio.sleep(1)
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> run greet',
+                'Hello world!',
+                'Hello world!',
+                '* success',
+                '',
+                '> run bss',
+                '* success',
+                '',
+                '> run bss',
+                '* success',
+                '',
+                '> run greet',
+                'Hello world!',
+                'Hello world!',
+                '* success',
+                '',
+                '>',
+            ])
+
+    @score(100)
+    async def _test_puts(self):
+        async with Tests.Qemu() as q:
+
+            await q.run('greet')
+
+            await q.run('shout')
+
+            await q.run('shout')
+
+            await q.run('greet')
+
+            await asyncio.sleep(2)
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> run greet',
+                'Hello world!',
+                'Hello world!',
+                '* success',
+                '',
+                '> run shout',
+                'cra cra trif traf not sgnieflet',
+                'cra cra trif traf not sgnieflet',
+                '* success',
+                '',
+                '> run shout',
+                'cra cra trif traf not sgnieflet',
+                'cra cra trif traf not sgnieflet',
+                '* success',
+                '',
+                '> run greet',
+                'Hello world!',
+                'Hello world!',
+                '* success',
+                '',
+                '>',
+            ])
+
+        async with Tests.Qemu() as q:
+
+            await q.run('greet')
+
+            await q.run('badputs')
+
+            await q.run('badputs')
+
+            await q.run('greet')
+
+            await asyncio.sleep(2)
+
+            dump = await q.dump_screen()
+
+            self.check_screen_content(dump, [
+                'YABLOKO',
+                '',
+                '> run greet',
+                'Hello world!',
+                'Hello world!',
+                '* success',
+                '',
+                '> run badputs',
+                'I hope the kernel does not panic...',
+                '* success',
+                '',
+                '> run badputs',
+                'I hope the kernel does not panic...',
+                '* success',
+                '',
+                '> run greet',
+                'Hello world!',
+                'Hello world!',
+                '* success',
+                '',
+                '>',
+            ])
+
+
+if __name__ == '__main__':
+    test_suite = unittest.defaultTestLoader.discover('.', 'tests.py')
+    test_runner = unittest.TextTestRunner(resultclass=unittest.TextTestResult)
+    result = test_runner.run(test_suite)
+    try:
+        with open('res.txt', 'r') as f:
+            res_score = int(f.read())
+    except:
+        res_score = 0
+    if result.wasSuccessful() or res_score != 0:
+        sys.exit(0)
+    sys.exit(1)
+