diff --git a/workspace_tools/host_tests/detect_auto.py b/workspace_tools/host_tests/detect_auto.py
index 18a9d29fc7..03ff17fa9d 100644
--- a/workspace_tools/host_tests/detect_auto.py
+++ b/workspace_tools/host_tests/detect_auto.py
@@ -15,31 +15,27 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-from host_test import DefaultTest
-from sys import stdout
 import re
+from host_test import DefaultTest
 
 
 class DetectPlatformTest(DefaultTest):
     PATTERN_MICRO_NAME = "Target '(\w+)'"
     re_detect_micro_name = re.compile(PATTERN_MICRO_NAME)
 
-    def run(self):
+    def test(self):
         result = True
 
         c = self.mbed.serial_readline() # {{start}} preamble
-        print c
         if c is None:
-           self.print_result(self.RESULT_IO_SERIAL)
-           return
+           return self.RESULT_IO_SERIAL
 
         self.notify(c.strip())
         self.notify("HOST: Detecting target name...")
 
         c = self.mbed.serial_readline()
         if c is None:
-           self.print_result(self.RESULT_IO_SERIAL)
-           return
+            return self.RESULT_IO_SERIAL
         self.notify(c.strip())
 
         # Check for target name
@@ -53,11 +49,10 @@ class DetectPlatformTest(DefaultTest):
         for i in range(0, 2):
             c = self.mbed.serial_readline()
             if c is None:
-               self.print_result(self.RESULT_IO_SERIAL)
-               return
+               return self.RESULT_IO_SERIAL
             self.notify(c.strip())
 
-        self.print_result(self.RESULT_SUCCESS if result else self.RESULT_FAILURE)
+        return self.RESULT_SUCCESS if result else self.RESULT_FAILURE
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/dev_null_auto.py b/workspace_tools/host_tests/dev_null_auto.py
index 3e6e0af6cb..6962b4f46e 100644
--- a/workspace_tools/host_tests/dev_null_auto.py
+++ b/workspace_tools/host_tests/dev_null_auto.py
@@ -16,7 +16,7 @@ limitations under the License.
 """
 
 from host_test import DefaultTest
-from sys import stdout
+
 
 class DevNullTest(DefaultTest):
 
@@ -25,18 +25,15 @@ class DevNullTest(DefaultTest):
         """
         result = False
         c = self.mbed.serial_readline()
-        if c is None:
-            self.print_result(self.RESULT_IO_SERIAL)
-            return None
-        if text in c:
+        if c and text in c:
             result = True
         return result
 
-    def run(self):
+    def test(self):
         result = True
-
         # Test should print some text and later stop printing
-        res = self.check_readline("re-routing stdout to /null")   # 'MBED: re-routing stdout to /null'
+        # 'MBED: re-routing stdout to /null'
+        res = self.check_readline("re-routing stdout to /null")
         if not res:
             # We haven't read preamble line
             result = False
@@ -46,16 +43,14 @@ class DevNullTest(DefaultTest):
             for i in range(3):
                 c = self.mbed.serial_read(32)
                 if c is None:
-                    self.print_result(self.RESULT_IO_SERIAL)
-                    return
+                    return self.RESULT_IO_SERIAL
                 else:
                     str += c
                 if len(str) > 0:
                     result = False
                     break
             self.notify("Received %d bytes: %s"% (len(str), str))
-
-        self.print_result(self.RESULT_SUCCESS if result else self.RESULT_FAILURE)
+        return self.RESULT_SUCCESS if result else self.RESULT_FAILURE
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/echo.py b/workspace_tools/host_tests/echo.py
index 1cfe3fbfd4..0e6856b186 100644
--- a/workspace_tools/host_tests/echo.py
+++ b/workspace_tools/host_tests/echo.py
@@ -14,6 +14,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+
 import sys
 import uuid
 from sys import stdout
@@ -21,42 +22,49 @@ from host_test import TestResults, Test
 
 
 class EchoTest(Test):
+    """ This host test will use mbed serial port with 
+        baudrate 115200 to perform echo test on that port.
+    """
+
     def __init__(self):
+        # Constructors
         TestResults.__init__(self)
         Test.__init__(self)
-        serial_init_res = self.mbed.init_serial(115200)
+        
+        # Test parameters
+        self.TEST_SERIAL_BAUDRATE = 115200
+        self.TEST_LOOP_COUNT = 50
+
+        # Initializations
+        serial_init_res = self.mbed.init_serial(self.TEST_SERIAL_BAUDRATE)
         if not serial_init_res:
             self.print_result(self.RESULT_IO_SERIAL)
         self.mbed.reset()
-        self.TEST_LOOP_COUNT = 50
 
     def test(self):
         """ Test function, return True or False to get standard test notification on stdout
         """
         c = self.mbed.serial_readline() # '{{start}}'
         if c is None:
-            self.print_result(self.RESULT_IO_SERIAL)
-            return
-        print c.strip()
-        stdout.flush()
+            return self.RESULT_IO_SERIAL
+        self.notify(c.strip())
 
         self.mbed.flush()
         self.notify("HOST: Starting the ECHO test")
         result = True
         for i in range(0, self.TEST_LOOP_COUNT):
-            TEST = str(uuid.uuid4()) + "\n"
-            self.mbed.serial_write(TEST)
+            TEST_STRING = str(uuid.uuid4()) + "\n"
+            self.mbed.serial_write(TEST_STRING)
             c = self.mbed.serial_readline()
             if c is None:
-                self.print_result(self.RESULT_IO_SERIAL)
-                return
-            if c.strip() != TEST.strip():
-                self.notify('HOST: "%s" != "%s"'% (c, TEST))
+                return self.RESULT_IO_SERIAL
+            if c.strip() != TEST_STRING.strip():
+                self.notify('HOST: "%s" != "%s"'% (c, TEST_STRING))
                 result = False
             else:
                 sys.stdout.write('.')
                 stdout.flush()
-        return result
+        return self.RESULT_SUCCESS if result else self.RESULT_FAILURE
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/hello_auto.py b/workspace_tools/host_tests/hello_auto.py
index 9c4f7d3a2f..27ea7a8530 100644
--- a/workspace_tools/host_tests/hello_auto.py
+++ b/workspace_tools/host_tests/hello_auto.py
@@ -16,24 +16,21 @@ limitations under the License.
 """
 
 from host_test import DefaultTest
-from sys import stdout
-import re
+
 
 class HelloTest(DefaultTest):
     HELLO_WORLD = "Hello World"
 
-    def run(self):
+    def test(self):
         c = self.mbed.serial_readline()
         if c is None:
-           self.print_result(self.RESULT_IO_SERIAL)
-           return
+           return self.RESULT_IO_SERIAL
         self.notify(c.strip())
 
         c = self.mbed.serial_readline()
         if c is None:
-           self.print_result(self.RESULT_IO_SERIAL)
-           return
-        self.notify("Read %d bytes"% len(c))
+           return self.RESULT_IO_SERIAL
+        self.notify("Read %d bytes:"% len(c))
         self.notify(c.strip())
 
         result = True
@@ -42,7 +39,7 @@ class HelloTest(DefaultTest):
             result = False
         else:
             result = self.HELLO_WORLD in c
-        self.print_result(self.RESULT_SUCCESS if result else self.RESULT_FAILURE)
+        return self.RESULT_SUCCESS if result else self.RESULT_FAILURE
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/host_test.py b/workspace_tools/host_tests/host_test.py
index 02fc52102c..5e9ce50f0e 100644
--- a/workspace_tools/host_tests/host_test.py
+++ b/workspace_tools/host_tests/host_test.py
@@ -22,10 +22,12 @@ except ImportError, e:
     print "Error: Can't import 'serial' module: %s"% e
     exit(-1)
 
+
 import os
-from optparse import OptionParser
-from time import sleep, time
 from sys import stdout
+from time import sleep, time
+from optparse import OptionParser
+
 
 # This is a little tricky. We need to add upper directory to path so
 # we can find packages we want from the same level as other files do
@@ -273,17 +275,20 @@ class Test(TestResults):
 
     def run(self):
         """ Test runner for host test. This function will start executing
-            test and forward test result via serial port to test suite
+            test() function and forward test result via serial port to test suite
         """
         try:
-            result = self.test()
-            self.print_result(self.RESULT_SUCCESS if result else self.RESULT_FAILURE)
+            # We expect here output from test in one of possible statuses
+            # E.g. self.RESULT_SUCCESS, self.RESULT_FAILURE, self.RESULT_ERROR
+            result_status = self.test()
+            self.print_result(result_status)
         except Exception, e:
-            print str(e)
+            self.notify(str(e))
             self.print_result(self.RESULT_ERROR)
 
     def setup(self):
-        """ Setup and check if configuration for test is correct. E.g. if serial port can be opened
+        """ Setup and check if configuration for test is correct.
+            E.g. if serial port can be opened
         """
         result = True
         if not self.mbed.serial:
@@ -320,17 +325,19 @@ class Simple(DefaultTest):
         output from MUT, no supervision over test running in MUT is executed.
         Just waiting for result
     """
-    def run(self):
+    def test(self):
         try:
             while True:
                 c = self.mbed.serial_read(512)
                 if c is None:
-                    self.print_result(self.RESULT_IO_SERIAL)
-                    break
+                    return self.RESULT_IO_SERIAL
                 stdout.write(c)
                 stdout.flush()
         except KeyboardInterrupt, _:
             self.notify("\r\n[CTRL+C] exit")
+        # If this function ends we assume user break or exception
+        # occured and error should be issued to test suite
+        return self.RESULT_ERROR
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/rtc_auto.py b/workspace_tools/host_tests/rtc_auto.py
index 4c31c65e07..0ccdce5665 100644
--- a/workspace_tools/host_tests/rtc_auto.py
+++ b/workspace_tools/host_tests/rtc_auto.py
@@ -18,13 +18,13 @@ limitations under the License.
 import re
 from host_test import DefaultTest
 from time import time, strftime, gmtime
-from sys import stdout
+
 
 class RTCTest(DefaultTest):
     PATTERN_RTC_VALUE = "\[(\d+)\] \[(\d+-\d+-\d+ \d+:\d+:\d+ [AaPpMm]{2})\]"
     re_detect_rtc_value = re.compile(PATTERN_RTC_VALUE)
 
-    def run(self):
+    def test(self):
         test_result = True
         start = time()
         sec_prev = 0
@@ -32,8 +32,7 @@ class RTCTest(DefaultTest):
             # Timeout changed from default: we need to wait longer for some boards to start-up
             c = self.mbed.serial_readline(timeout=10)
             if c is None:
-                self.print_result(self.RESULT_IO_SERIAL)
-                return
+                return self.RESULT_IO_SERIAL
             self.notify(c.strip())
             delta = time() - start
             m = self.re_detect_rtc_value.search(c)
@@ -49,7 +48,7 @@ class RTCTest(DefaultTest):
                 test_result = False
                 break
             start = time()
-        self.print_result(self.RESULT_SUCCESS if test_result else self.RESULT_FAILURE)
+        return self.RESULT_SUCCESS if test_result else self.RESULT_FAILURE
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/stdio_auto.py b/workspace_tools/host_tests/stdio_auto.py
index 3b30ea1a68..c0c7a58076 100644
--- a/workspace_tools/host_tests/stdio_auto.py
+++ b/workspace_tools/host_tests/stdio_auto.py
@@ -17,21 +17,20 @@ limitations under the License.
 
 import re
 import random
-from sys import stdout
 from time import time
 from host_test import DefaultTest
 
+
 class StdioTest(DefaultTest):
     PATTERN_INT_VALUE = "Your value was: (-?\d+)"
     re_detect_int_value = re.compile(PATTERN_INT_VALUE)
 
-    def run(self):
+    def test(self):
         test_result = True
 
         c = self.mbed.serial_readline() # {{start}} preamble
         if c is None:
-            self.print_result(self.RESULT_IO_SERIAL)
-            return
+            return self.RESULT_IO_SERIAL
         self.notify(c)
 
         for i in range(0, 10):
@@ -42,8 +41,7 @@ class StdioTest(DefaultTest):
 
             serial_stdio_msg = self.mbed.serial_readline()
             if c is None:
-                self.print_result(self.RESULT_IO_SERIAL)
-                return
+                return self.RESULT_IO_SERIAL
             delay_time = time() - start
             self.notify(serial_stdio_msg.strip())
 
@@ -57,8 +55,7 @@ class StdioTest(DefaultTest):
             else:
                 test_result = False
                 break
-
-        self.print_result(self.RESULT_SUCCESS if test_result else self.RESULT_FAILURE)
+        return self.RESULT_SUCCESS if test_result else self.RESULT_FAILURE
 
 
 if __name__ == '__main__':
diff --git a/workspace_tools/host_tests/tcpecho_client_auto.py b/workspace_tools/host_tests/tcpecho_client_auto.py
index 9d937a4c01..1007a68f62 100644
--- a/workspace_tools/host_tests/tcpecho_client_auto.py
+++ b/workspace_tools/host_tests/tcpecho_client_auto.py
@@ -18,7 +18,6 @@ limitations under the License.
 import sys
 import socket
 from sys import stdout
-from time import sleep
 from host_test import Test
 from SocketServer import BaseRequestHandler, TCPServer
 
diff --git a/workspace_tools/host_tests/tcpecho_server_auto.py b/workspace_tools/host_tests/tcpecho_server_auto.py
index 22dacd75bb..3532325d3f 100644
--- a/workspace_tools/host_tests/tcpecho_server_auto.py
+++ b/workspace_tools/host_tests/tcpecho_server_auto.py
@@ -20,9 +20,9 @@ import sys
 import uuid
 import socket
 from sys import stdout
-from time import time
 from host_test import DefaultTest
 
+
 class TCPEchoServerTest(DefaultTest):
     ECHO_SERVER_ADDRESS = ""
     ECHO_PORT = 0
diff --git a/workspace_tools/host_tests/udpecho_server_auto.py b/workspace_tools/host_tests/udpecho_server_auto.py
index 523c7d8beb..a71fdf17d4 100644
--- a/workspace_tools/host_tests/udpecho_server_auto.py
+++ b/workspace_tools/host_tests/udpecho_server_auto.py
@@ -15,12 +15,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-
 import re
 import sys
 import uuid
 from sys import stdout
-from time import time
 from host_test import DefaultTest
 from socket import socket, AF_INET, SOCK_DGRAM
 
diff --git a/workspace_tools/host_tests/wait_us_auto.py b/workspace_tools/host_tests/wait_us_auto.py
index a331fd4047..0e5d553cef 100644
--- a/workspace_tools/host_tests/wait_us_auto.py
+++ b/workspace_tools/host_tests/wait_us_auto.py
@@ -15,38 +15,36 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-from host_test import DefaultTest
 from time import time
-from sys import stdout
+from host_test import DefaultTest
+
 
 class WaitusTest(DefaultTest):
-    def run(self):
+    """ This test is reading single characters from stdio
+        and measures time between their occurrences.
+    """
+    def test(self):
         test_result = True
         # First character to start test (to know after reset when test starts)
         if self.mbed.serial_timeout(None) is None:
-            self.print_result(self.RESULT_IO_SERIAL)
-            return
+            return self.RESULT_IO_SERIAL
         c = self.mbed.serial_read(1)
         if c is None:
-            self.print_result(self.RESULT_IO_SERIAL)
-            return
+            return self.RESULT_IO_SERIAL
         if c == '$': # target will printout TargetID e.g.: $$$$1040e649d5c09a09a3f6bc568adef61375c6
             #Read additional 39 bytes of TargetID
             if self.mbed.serial_read(39) is None:
-                self.print_result(self.RESULT_IO_SERIAL)
-                return
+                return self.RESULT_IO_SERIAL
             c = self.mbed.serial_read(1) # Re-read first 'tick'
             if c is None:
-                self.print_result(self.RESULT_IO_SERIAL)
-                return
+                return self.RESULT_IO_SERIAL
         self.notify("Test started")
         start_serial_pool = time()
         start = time()
         for i in range(0, 10):
             c = self.mbed.serial_read(1)
             if c is None:
-                self.print_result(self.RESULT_IO_SERIAL)
-                return
+                return self.RESULT_IO_SERIAL
             if i > 2: # we will ignore first few measurements
                 delta = time() - start
                 deviation = abs(delta - 1)
@@ -60,12 +58,11 @@ class WaitusTest(DefaultTest):
                 self.notify(". in %.2f sec (%.2f) [%s]" % (delta, deviation, msg))
             else:
                 self.notify(". skipped")
-            stdout.flush()
             start = time()
         measurement_time = time() - start_serial_pool
         self.notify("Completed in %.2f sec" % (measurement_time))
-        self.print_result(self.RESULT_SUCCESS if test_result else self.RESULT_FAILURE)
+        return self.RESULT_SUCCESS if test_result else self.RESULT_FAILURE
+
 
-        
 if __name__ == '__main__':
     WaitusTest().run()