diff --git a/bitbake/lib/toaster/contrib/tts/runner.py b/bitbake/lib/toaster/contrib/tts/runner.py
index 6fc3e77523..bed665196e 100755
--- a/bitbake/lib/toaster/contrib/tts/runner.py
+++ b/bitbake/lib/toaster/contrib/tts/runner.py
@@ -31,7 +31,7 @@ from __future__ import print_function
 import sys, os
 import unittest, importlib
 import logging, pprint, json
-
+import re
 from shellutils import ShellCmdException, mkdirhier, run_shell_cmd
 
 import config
@@ -121,13 +121,16 @@ def execute_tests(dir_under_test, testname):
     # pylint: disable=broad-except
     # we disable the broad-except because we want to actually catch all possible exceptions
     try:
+        # sorting the tests by the numeric order in the class name
+        tests = sorted(tests, key=lambda x: int(re.search(r"[0-9]+", x[1]).group(0)))
         config.logger.debug("Discovered test clases: %s", pprint.pformat(tests))
         unittest.installHandler()
         suite = unittest.TestSuite()
         loader = unittest.TestLoader()
         result = unittest.TestResult()
-        for module_file, name in tests:
-            suite.addTest(loader.loadTestsFromName("%s.%s" % (module_file, name)))
+        result.failfast = True
+        for module_file, test_name in tests:
+            suite.addTest(loader.loadTestsFromName("%s.%s" % (module_file, test_name)))
         config.logger.info("Running %d test(s)", suite.countTestCases())
         suite.run(result)
 
@@ -202,7 +205,7 @@ def main():
         config.TESTDIR = testdir    # we let tests know where to run
 
         # ensure that the test dir only contains no *.pyc leftovers
-        run_shell_cmd("find '%s' -type f -name *.pyc -exec rm {} \;" % testdir)
+        run_shell_cmd("find '%s' -type f -name *.pyc -exec rm {} \\;" % testdir)
 
         no_failures = execute_tests(testdir, options.singletest)
 
diff --git a/bitbake/lib/toaster/contrib/tts/tests.py b/bitbake/lib/toaster/contrib/tts/tests.py
index 9acef46a38..3a4eed1e9f 100644
--- a/bitbake/lib/toaster/contrib/tts/tests.py
+++ b/bitbake/lib/toaster/contrib/tts/tests.py
@@ -30,7 +30,7 @@ import config
 import pexpect
 import sys, os, signal, time
 
-class TestPyCompilable(unittest.TestCase):
+class Test00PyCompilable(unittest.TestCase):
     ''' Verifies that all Python files are syntactically correct '''
     def test_compile_file(self):
         try:
@@ -38,7 +38,7 @@ class TestPyCompilable(unittest.TestCase):
         except ShellCmdException as exc:
             self.fail("Error compiling python files: %s" % (exc))
 
-class TestPySystemStart(unittest.TestCase):
+class Test01PySystemStart(unittest.TestCase):
     ''' Attempts to start Toaster, verify that it is succesfull, and stop it '''
     def setUp(self):
         run_shell_cmd("bash -c 'rm -f build/*log'")
@@ -55,7 +55,7 @@ class TestPySystemStart(unittest.TestCase):
         except ShellCmdException as exc:
             self.fail("Failed starting managed mode: %s" % (exc))
 
-class TestHTML5Compliance(unittest.TestCase):
+class Test02HTML5Compliance(unittest.TestCase):
     def setUp(self):
         self.origdir = os.getcwd()
         self.crtdir = os.path.dirname(config.TESTDIR)