diff --git a/kernel/trunk/boot/preboot.inc b/kernel/trunk/boot/preboot.inc
index 1492e181f8..eff3072be4 100644
--- a/kernel/trunk/boot/preboot.inc
+++ b/kernel/trunk/boot/preboot.inc
@@ -30,7 +30,14 @@ preboot_device      db  0 ; device to load ramdisk from
                           ;   1-floppy 2-harddisk 3-kernel restart
                           ;   4-format ram disk 5-don't use ramdisk
                           ; !!!! 0 - autodetect !!!!
-preboot_biosdisk    db  0 ; use V86 to access disks through BIOS (1-yes, 2-no)
+
+; use V86 to access disks through BIOS (1-yes, 2-no)
+if defined pretest_build
+  preboot_biosdisk  db  1
+else
+  preboot_biosdisk  db  0
+end if
+
 preboot_syspath     db  '/RD/1',0 ; path to /sys dir
                     rb  20-($-preboot_syspath)
 if defined extended_primary_loader
diff --git a/kernel/trunk/bootbios.asm b/kernel/trunk/bootbios.asm
index 7039a6769f..ec5d944b80 100644
--- a/kernel/trunk/bootbios.asm
+++ b/kernel/trunk/bootbios.asm
@@ -11,7 +11,11 @@ include 'encoding.inc'
 include 'const.inc'
 
 os_code = code_l - tmp_gdt
-PREBOOT_TIMEOUT = 5   ; seconds
+if defined pretest_build
+  PREBOOT_TIMEOUT = 0 ; seconds
+else
+  PREBOOT_TIMEOUT = 5
+end if
 
 use16
                   org   0x0
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index ffe99bb925..9db1dccf09 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -144,10 +144,12 @@ pci_data_sel   =  pci_data_32-gdts
 ; places revision number there.
 if ~ defined UEFI
   bootbios:
-  if ~ defined extended_primary_loader
-    file 'bootbios.bin'
-  else
+  if defined extended_primary_loader
     file 'bootbios.bin.ext_loader'
+  else if defined pretest_build
+    file 'bootbios.bin.pretest'
+  else
+    file 'bootbios.bin'
   end if
   if __REV__ > 0
     cur_pos = 0
diff --git a/kernel/trunk/runtests.py b/kernel/trunk/runtests.py
new file mode 100755
index 0000000000..9c3846395b
--- /dev/null
+++ b/kernel/trunk/runtests.py
@@ -0,0 +1,95 @@
+#!/usr/bin/python3
+# Copyright 2021 KolibriOS Team
+# Copyright 2021 Nekos Team
+# Published under MIT License
+
+import os
+import sys
+from importlib.machinery import SourceFileLoader
+import timeit
+import urllib.request
+import subprocess
+
+sys.path.append('test')
+import common
+
+root_dir = os.getcwd()
+tests = []
+
+def log(s, end = "\n"):
+    print(s, end = end, flush = True)
+
+def execute(s, mute = False):
+    mute = ">/dev/null" if mute else ""
+    code = os.system(f"{s}{mute}")
+    if code:
+        print(f"Command returned {code}: \"{s}\"")
+        exit(-1)
+
+def stage(name, command, mute = False):
+    print(f"{name}... ", end = "")
+    execute(command, mute = mute)
+    print("Done.")
+
+if not os.path.exists("kolibri_test.img"):
+    if len(sys.argv) == 1:
+        execute("wget -q --show-progress http://builds.kolibrios.org/eng/data/data/kolibri.img -O kolibri_test.img")
+    else:
+        builds = sys.argv[1]
+        execute(f"cp {builds}/data/data/kolibri.img kolibri_test.img")
+
+# Remove old kernel (may fail if we removed it before so no check here)
+os.system("mdel -i kolibri_test.img ::kernel.mnt > /dev/null")
+
+# Check free space after kernel remove
+free_clusters = int(subprocess.check_output("mdu -i kolibri_test.img :: -s", shell=True).split()[-1])
+floppy_image_clusters = 2880
+if floppy_image_clusters - free_clusters < 500:
+    # Remove unuseful files from IMG if lesser than 500 sectors
+    execute("mdeltree -i kolibri_test.img ::GAMES", mute = True)
+    execute("mdeltree -i kolibri_test.img ::DEMOS", mute = True)
+    execute("mdeltree -i kolibri_test.img ::3D", mute = True)
+
+# Build kernel with debug output
+stage("Building bootbios.bin.pretest",
+      "fasm -m 65536 -dpretest_build=1 bootbios.asm bootbios.bin.pretest", mute = True)
+
+stage("Building kernel.mnt.pretest",
+      "fasm -m 65536 -dpretest_build=1 -ddebug_com_base=0xe9 kernel.asm kernel.mnt.pretest", mute = True)
+
+# Put the kernel into IMG
+execute("mcopy -D o -i kolibri_test.img kernel.mnt.pretest ::kernel.mnt", mute = True)
+
+# Collect tests from test folder (not recursively yet)
+for test_folder in os.listdir("test"):
+    test_folder_path = f"test/{test_folder}"
+    test_file = f"{test_folder_path}/test.py"
+
+    if not os.path.isdir(test_folder_path):
+        continue
+
+    if os.path.exists(test_file):
+        tests.append(test_folder_path)
+
+# Execute each test
+test_number = 1
+for test in tests:
+    test_dir = f"{root_dir}/{test}"
+
+    os.chdir(test_dir)
+    print(f"[{test_number}/{len(tests)}] {test}... ", end = "", flush=True)
+    start = timeit.default_timer()
+    try:
+        SourceFileLoader("test", "test.py").load_module().run()
+    except common.TestTimeoutException:
+        result = "TIMEOUT"
+    except common.TestFailureException:
+        result = "FAILURE"
+    else:
+        result = "SUCCESS"
+    finish = timeit.default_timer()
+    print(f"{result} ({finish - start:.2f} seconds)")
+    os.chdir(root_dir)
+
+    test_number += 1
+
diff --git a/kernel/trunk/test/common/__init__.py b/kernel/trunk/test/common/__init__.py
new file mode 100644
index 0000000000..c4dea74b83
--- /dev/null
+++ b/kernel/trunk/test/common/__init__.py
@@ -0,0 +1,68 @@
+# Copyright 2021 KolibriOS Team
+# Copyright 2021 Nekos Team
+# Published under MIT License
+
+import io
+import os
+import subprocess
+import timeit
+import time
+import shlex
+import signal
+
+class TestTimeoutException(Exception):
+    pass
+
+class TestFailureException(Exception):
+    pass
+
+class Qemu:
+    def __init__(self, popen):
+        self.popen = popen
+        self.wait() # qemu needs time to create debug.log file
+
+    def wait_for_debug_log(self, needle, timeout = 1):
+        needle = bytes(needle, "utf-8")
+        start = timeit.default_timer()
+        stdout = open("debug.log", "rb")
+        log = b""
+
+        # While no timeout, read and search logs
+        while timeit.default_timer() - start < timeout:
+            log += stdout.read(1)
+            if needle in log:
+                return
+
+            # We don't have to read whole logs to find the neddle
+            # If we read len(needle) * 2 bytes of log then we
+            # already can say that if there's no needle in the data
+            # then it can't be in first len(needle) bytes of the data
+            # so first len(needle) bytes of saved logs may be thrown away
+            #
+            # So we consume lessser memory and don't search all the previous
+            # logs every single time
+            if len(log) > len(needle) * 2:
+                log = log[len(needle):]
+
+        self.timeout()
+
+    def kill(self):
+        os.killpg(os.getpgid(self.popen.pid), signal.SIGTERM)
+
+    def failure(self):
+        self.kill()
+        raise TestFailureException()
+
+    def timeout(self):
+        self.kill()
+        raise TestTimeoutException()
+
+    def wait(self, seconds = 0.25):
+        time.sleep(seconds)
+
+def run():
+    s = f"qemu-system-i386 -nographic -L . -m 128 -drive format=raw,file=../../kolibri_test.img,index=0,if=floppy -boot a -vga vmware -net nic,model=rtl8139 -net user -soundhw ac97 -debugcon file:debug.log"
+    a = shlex.split(s)
+    popen = subprocess.Popen(a, bufsize = 0, stdout = subprocess.DEVNULL, stderr = subprocess.DEVNULL, start_new_session = True)
+    return Qemu(popen)
+
diff --git a/kernel/trunk/test/kernel_revision/test.py b/kernel/trunk/test/kernel_revision/test.py
new file mode 100644
index 0000000000..a4f6a1609a
--- /dev/null
+++ b/kernel/trunk/test/kernel_revision/test.py
@@ -0,0 +1,11 @@
+#!/usr/bin/python3
+import sys
+
+sys.path.append('../')
+import common
+
+def run():
+    os = common.run()
+    os.wait_for_debug_log("K : kernel SVN", timeout = 10)
+    os.kill()
+