diff --git a/tests/test_qltool.py b/tests/test_qltool.py
index 3168664b..79f25738 100644
--- a/tests/test_qltool.py
+++ b/tests/test_qltool.py
@@ -5,50 +5,47 @@
 
 import os
 import subprocess
+import re
 import sys
 import unittest
 
 
 class Qltool_Test(unittest.TestCase):
-    def test_qltool_exec_args(self):
-        create = [sys.executable, '../qltool', 'run', '-f', '../examples/rootfs/x8664_linux/bin/x8664_args', '--rootfs', '../examples/rootfs/x8664_linux', '--verbose', 'off', '--args', 'test1', 'test2' ,'test3']
-        p = subprocess.Popen(create, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-        for line in iter(p.stdout.readline, b''):
-            self.stdout = line
+    def __run(self, cmdline: str) -> bytes:
+        try:
+            output = subprocess.check_output([sys.executable] + cmdline.split(), stderr=subprocess.STDOUT)
+        except subprocess.CalledProcessError as e:
+            raise RuntimeError(f"command '{e.cmd}' return with error (code {e.returncode}): {e.output}")
+        else:
+            return output
 
-        self.assertEqual(b'arg        2 test3\n', self.stdout)
+    def test_qltool_exec_args(self):
+        output = self.__run(r'../qltool run -f ../examples/rootfs/x8664_linux/bin/x8664_args --rootfs ../examples/rootfs/x8664_linux --verbose off --args test1 test2 test3')
+
+        self.assertEqual(b'arg        2 test3', output.splitlines()[-1])
 
     def test_qltool_shellcode(self):
-        create = [sys.executable, '../qltool', 'code', '--os','linux','--arch', 'x86', '--format', 'asm', '-f', '../examples/shellcodes/lin32_execve.asm']
-        try:
-            subprocess.check_output(create,stderr=subprocess.STDOUT)
-        except subprocess.CalledProcessError as e:
-            raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))
+        self.__run(r'../qltool code --os linux --arch x86 --format asm -f ../examples/shellcodes/lin32_execve.asm')
 
     def test_qltool_coverage(self):
-        os.makedirs("./log_test", exist_ok=True)
-        create = [sys.executable, '../qltool', 'run', '-f','../examples/rootfs/x8664_efi/bin/TcgPlatformSetupPolicy','--rootfs', '../examples/rootfs/x8664_efi','--coverage-format', 'drcov', '--coverage-file', 'log_test/TcgPlatformSetupPolicy']
-        try:
-            subprocess.check_output(create, stderr=subprocess.STDOUT)
-        except subprocess.CalledProcessError as e:
-            raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))
+        os.makedirs(r'./log_test', exist_ok=True)
+
+        self.__run(r'../qltool run -f ../examples/rootfs/x8664_efi/bin/TcgPlatformSetupPolicy --rootfs ../examples/rootfs/x8664_efi --coverage-format drcov --coverage-file log_test/TcgPlatformSetupPolicy')
 
     def test_qltool_json(self):
-        create = [sys.executable, '../qltool', 'run', '-f','../examples/rootfs/x86_linux/bin/x86_hello','--rootfs', '../examples/rootfs/x86_linux','--verbose', 'off', '--json']
-        try:
-            subprocess.check_output(create, stderr=subprocess.STDOUT)
-        except subprocess.CalledProcessError as e:
-            raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))
+        self.__run(r'../qltool run -f ../examples/rootfs/x86_linux/bin/x86_hello --rootfs ../examples/rootfs/x86_linux --verbose off --json')
 
     def test_qltool_filter(self):
-        create = [sys.executable, '../qltool', 'run', '-f', '../examples/rootfs/arm_linux/bin/arm_hello', '--rootfs', '../examples/rootfs/arm_linux', '-e', '^(open|brk)', '--log-plain']
-        try:
-            output = subprocess.check_output(create, stderr=subprocess.STDOUT)
-        except subprocess.CalledProcessError as e:
-            raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))
+        filter_pattern = r'^(open|brk)'
+        output = self.__run(fr'../qltool run -f ../examples/rootfs/arm_linux/bin/arm_hello --rootfs ../examples/rootfs/arm_linux -e {filter_pattern} --log-plain')
 
-        lines = [ line.strip('[=]\t') for line in output.decode().split("\n")]
-        self.assertTrue(all(filter(lambda x: x.startswith("open") or x.startswith("brk"), lines)))
+        # keep only log entries and strip them from log prefix
+        p = re.compile(rb'^\[\S\]\s+')
+        log_entries = (p.sub(b'', line) for line in output.splitlines() if p.match(line))
+
+        # make sure that all log entries are of the expected regex filter pattern
+        p = re.compile(filter_pattern.encode())
+        self.assertTrue(all(p.search(entry) is not None for entry in log_entries))
 
 
 if __name__ == "__main__":