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Azim Khan951a2c82018-06-29 03:47:08 +01001# Greentea host test script for Mbed TLS on-target test suite testing.
Azim Khanf0e42fb2017-08-02 14:47:13 +01002#
Azim Khan8d686bf2018-07-04 23:29:46 +01003# Copyright (C) 2018, Arm Limited, All Rights Reserved
Azim Khanf0e42fb2017-08-02 14:47:13 +01004# SPDX-License-Identifier: Apache-2.0
5#
6# Licensed under the Apache License, Version 2.0 (the "License"); you may
7# not use this file except in compliance with the License.
8# You may obtain a copy of the License at
9#
10# http://www.apache.org/licenses/LICENSE-2.0
11#
12# Unless required by applicable law or agreed to in writing, software
13# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
14# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15# See the License for the specific language governing permissions and
16# limitations under the License.
17#
Azim Khanb31aa442018-07-03 11:57:54 +010018# This file is part of Mbed TLS (https://tls.mbed.org)
Azim Khanf0e42fb2017-08-02 14:47:13 +010019
20
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010021"""
Azim Khan8d686bf2018-07-04 23:29:46 +010022Mbed TLS on-target test suite tests are implemented as Greentea
Azim Khan951a2c82018-06-29 03:47:08 +010023tests. Greentea tests are implemented in two parts: target test and
24host test. Target test is a C application that is built for the
25target platform and executes on the target. Host test is a Python
26class derived from mbed_host_tests.BaseHostTest. Target communicates
Azim Khan8d686bf2018-07-04 23:29:46 +010027with the host over serial for the test data and sends back the result.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010028
Azim Khanb31aa442018-07-03 11:57:54 +010029Python tool mbedgt (Greentea) is responsible for flashing the test
Azim Khan8d686bf2018-07-04 23:29:46 +010030binary on to the target and dynamically loading this host test module.
Azim Khan951a2c82018-06-29 03:47:08 +010031
Azim Khan8d686bf2018-07-04 23:29:46 +010032Greentea documentation can be found here:
33https://github.com/ARMmbed/greentea
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010034"""
35
Azim Khanf0e42fb2017-08-02 14:47:13 +010036
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010037import re
38import os
Azim Khan663d4702017-07-07 15:40:26 +010039import binascii
Gilles Peskinee915d532019-02-25 21:39:42 +010040
41from mbed_host_tests import BaseHostTest, event_callback # pylint: disable=import-error
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010042
43
Azim Khanb98e6ee2018-06-28 17:11:33 +010044class TestDataParserError(Exception):
45 """Indicates error in test data, read from .data file."""
46 pass
47
48
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010049class TestDataParser(object):
50 """
Azim Khan951a2c82018-06-29 03:47:08 +010051 Parses test name, dependencies, test function name and test parameters
52 from the data file.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010053 """
54
55 def __init__(self):
56 """
57 Constructor
58 """
59 self.tests = []
60
61 def parse(self, data_file):
62 """
Azim Khanf0e42fb2017-08-02 14:47:13 +010063 Data file parser.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010064
Azim Khanf0e42fb2017-08-02 14:47:13 +010065 :param data_file: Data file path
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010066 """
Azim Khanb31aa442018-07-03 11:57:54 +010067 with open(data_file, 'r') as data_f:
68 self.__parse(data_f)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010069
70 @staticmethod
Azim Khanb31aa442018-07-03 11:57:54 +010071 def __escaped_split(inp_str, split_char):
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010072 """
Azim Khanb31aa442018-07-03 11:57:54 +010073 Splits inp_str on split_char except when escaped.
Azim Khanf0e42fb2017-08-02 14:47:13 +010074
Azim Khanb31aa442018-07-03 11:57:54 +010075 :param inp_str: String to split
76 :param split_char: Split character
Azim Khanf0e42fb2017-08-02 14:47:13 +010077 :return: List of splits
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010078 """
Ron Eldor111ba0e2018-11-18 17:05:05 +020079 split_colon_fn = lambda x: re.sub(r'\\' + split_char, split_char, x)
Azim Khanb31aa442018-07-03 11:57:54 +010080 if len(split_char) > 1:
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010081 raise ValueError('Expected split character. Found string!')
Ron Eldor111ba0e2018-11-18 17:05:05 +020082 out = map(split_colon_fn, re.split(r'(?<!\\)' + split_char, inp_str))
Mohammad Azim Khan32cbcda2018-07-06 00:29:09 +010083 out = [x for x in out if x]
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010084 return out
85
Azim Khanb31aa442018-07-03 11:57:54 +010086 def __parse(self, data_f):
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010087 """
Azim Khanf0e42fb2017-08-02 14:47:13 +010088 Parses data file using supplied file object.
89
Azim Khanb31aa442018-07-03 11:57:54 +010090 :param data_f: Data file object
Azim Khanf0e42fb2017-08-02 14:47:13 +010091 :return:
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010092 """
Azim Khanb31aa442018-07-03 11:57:54 +010093 for line in data_f:
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010094 line = line.strip()
Azim Khanb31aa442018-07-03 11:57:54 +010095 if not line:
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +010096 continue
97 # Read test name
98 name = line
99
100 # Check dependencies
Azim Khanb31aa442018-07-03 11:57:54 +0100101 dependencies = []
102 line = data_f.next().strip()
103 match = re.search('depends_on:(.*)', line)
104 if match:
105 dependencies = [int(x) for x in match.group(1).split(':')]
106 line = data_f.next().strip()
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100107
108 # Read test vectors
Azim Khan663d4702017-07-07 15:40:26 +0100109 line = line.replace('\\n', '\n')
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100110 parts = self.__escaped_split(line, ':')
Azim Khanb31aa442018-07-03 11:57:54 +0100111 function_name = int(parts[0])
112 args = parts[1:]
113 args_count = len(args)
114 if args_count % 2 != 0:
Ron Eldor111ba0e2018-11-18 17:05:05 +0200115 err_str_fmt = "Number of test arguments({}) should be even: {}"
116 raise TestDataParserError(err_str_fmt.format(args_count, line))
Azim Khanb31aa442018-07-03 11:57:54 +0100117 grouped_args = [(args[i * 2], args[(i * 2) + 1])
118 for i in range(len(args)/2)]
119 self.tests.append((name, function_name, dependencies,
120 grouped_args))
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100121
122 def get_test_data(self):
123 """
Azim Khanf0e42fb2017-08-02 14:47:13 +0100124 Returns test data.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100125 """
126 return self.tests
127
128
129class MbedTlsTest(BaseHostTest):
130 """
Azim Khanb31aa442018-07-03 11:57:54 +0100131 Host test for Mbed TLS unit tests. This script is loaded at
132 run time by Greentea for executing Mbed TLS test suites. Each
Azim Khan951a2c82018-06-29 03:47:08 +0100133 communication from the target is received in this object as
134 an event, which is then handled by the event handler method
135 decorated by the associated event. Ex: @event_callback('GO').
136
137 Target test sends requests for dispatching next test. It reads
138 tests from the intermediate data file and sends test function
139 identifier, dependency identifiers, expression identifiers and
Azim Khanb31aa442018-07-03 11:57:54 +0100140 the test data in binary form. Target test checks dependencies
Azim Khan951a2c82018-06-29 03:47:08 +0100141 , evaluate integer constant expressions and dispatches the test
Azim Khan8d686bf2018-07-04 23:29:46 +0100142 function with received test parameters. After test function is
143 finished, target sends the result. This class handles the result
144 event and prints verdict in the form that Greentea understands.
Azim Khan951a2c82018-06-29 03:47:08 +0100145
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100146 """
Azim Khan951a2c82018-06-29 03:47:08 +0100147 # status/error codes from suites/helpers.function
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100148 DEPENDENCY_SUPPORTED = 0
149 KEY_VALUE_MAPPING_FOUND = DEPENDENCY_SUPPORTED
150 DISPATCH_TEST_SUCCESS = DEPENDENCY_SUPPORTED
151
Azim Khan951a2c82018-06-29 03:47:08 +0100152 KEY_VALUE_MAPPING_NOT_FOUND = -1 # Expression Id not found.
153 DEPENDENCY_NOT_SUPPORTED = -2 # Dependency not supported.
154 DISPATCH_TEST_FN_NOT_FOUND = -3 # Test function not found.
155 DISPATCH_INVALID_TEST_DATA = -4 # Invalid parameter type.
156 DISPATCH_UNSUPPORTED_SUITE = -5 # Test suite not supported/enabled.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100157
158 def __init__(self):
159 """
Azim Khanf0e42fb2017-08-02 14:47:13 +0100160 Constructor initialises test index to 0.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100161 """
162 super(MbedTlsTest, self).__init__()
163 self.tests = []
164 self.test_index = -1
165 self.dep_index = 0
Ron Eldor8672cb72018-11-13 18:42:35 +0200166 self.suite_passed = True
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100167 self.error_str = dict()
Azim Khanb31aa442018-07-03 11:57:54 +0100168 self.error_str[self.DEPENDENCY_SUPPORTED] = \
169 'DEPENDENCY_SUPPORTED'
170 self.error_str[self.KEY_VALUE_MAPPING_NOT_FOUND] = \
171 'KEY_VALUE_MAPPING_NOT_FOUND'
172 self.error_str[self.DEPENDENCY_NOT_SUPPORTED] = \
173 'DEPENDENCY_NOT_SUPPORTED'
174 self.error_str[self.DISPATCH_TEST_FN_NOT_FOUND] = \
175 'DISPATCH_TEST_FN_NOT_FOUND'
176 self.error_str[self.DISPATCH_INVALID_TEST_DATA] = \
177 'DISPATCH_INVALID_TEST_DATA'
178 self.error_str[self.DISPATCH_UNSUPPORTED_SUITE] = \
179 'DISPATCH_UNSUPPORTED_SUITE'
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100180
181 def setup(self):
182 """
Azim Khan951a2c82018-06-29 03:47:08 +0100183 Setup hook implementation. Reads test suite data file and parses out
184 tests.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100185 """
186 binary_path = self.get_config_item('image_path')
187 script_dir = os.path.split(os.path.abspath(__file__))[0]
188 suite_name = os.path.splitext(os.path.basename(binary_path))[0]
Ron Eldorc242eea2018-11-05 16:22:36 +0200189 data_file = ".".join((suite_name, 'datax'))
Azim Khan951a2c82018-06-29 03:47:08 +0100190 data_file = os.path.join(script_dir, '..', 'mbedtls',
191 suite_name, data_file)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100192 if os.path.exists(data_file):
193 self.log("Running tests from %s" % data_file)
194 parser = TestDataParser()
195 parser.parse(data_file)
196 self.tests = parser.get_test_data()
197 self.print_test_info()
198 else:
199 self.log("Data file not found: %s" % data_file)
200 self.notify_complete(False)
201
202 def print_test_info(self):
203 """
Azim Khanf0e42fb2017-08-02 14:47:13 +0100204 Prints test summary read by Greentea to detect test cases.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100205 """
206 self.log('{{__testcase_count;%d}}' % len(self.tests))
207 for name, _, _, _ in self.tests:
208 self.log('{{__testcase_name;%s}}' % name)
209
210 @staticmethod
Azim Khanb31aa442018-07-03 11:57:54 +0100211 def align_32bit(data_bytes):
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100212 """
Azim Khanf0e42fb2017-08-02 14:47:13 +0100213 4 byte aligns input byte array.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100214
215 :return:
216 """
Azim Khanb31aa442018-07-03 11:57:54 +0100217 data_bytes += bytearray((4 - (len(data_bytes))) % 4)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100218
Azim Khand59391a2017-06-01 14:04:17 +0100219 @staticmethod
220 def hex_str_bytes(hex_str):
221 """
222 Converts Hex string representation to byte array
223
Azim Khanf0e42fb2017-08-02 14:47:13 +0100224 :param hex_str: Hex in string format.
225 :return: Output Byte array
Azim Khand59391a2017-06-01 14:04:17 +0100226 """
Azim Khanb98e6ee2018-06-28 17:11:33 +0100227 if hex_str[0] != '"' or hex_str[len(hex_str) - 1] != '"':
228 raise TestDataParserError("HEX test parameter missing '\"':"
229 " %s" % hex_str)
Azim Khand59391a2017-06-01 14:04:17 +0100230 hex_str = hex_str.strip('"')
Azim Khanb98e6ee2018-06-28 17:11:33 +0100231 if len(hex_str) % 2 != 0:
232 raise TestDataParserError("HEX parameter len should be mod of "
233 "2: %s" % hex_str)
Azim Khand59391a2017-06-01 14:04:17 +0100234
Azim Khanb31aa442018-07-03 11:57:54 +0100235 data_bytes = binascii.unhexlify(hex_str)
236 return data_bytes
Azim Khand59391a2017-06-01 14:04:17 +0100237
Azim Khan663d4702017-07-07 15:40:26 +0100238 @staticmethod
Azim Khanb31aa442018-07-03 11:57:54 +0100239 def int32_to_big_endian_bytes(i):
Azim Khan663d4702017-07-07 15:40:26 +0100240 """
Azim Khanb31aa442018-07-03 11:57:54 +0100241 Coverts i to byte array in big endian format.
Azim Khan663d4702017-07-07 15:40:26 +0100242
Azim Khanf0e42fb2017-08-02 14:47:13 +0100243 :param i: Input integer
244 :return: Output bytes array in big endian or network order
Azim Khan663d4702017-07-07 15:40:26 +0100245 """
Azim Khanb31aa442018-07-03 11:57:54 +0100246 data_bytes = bytearray([((i >> x) & 0xff) for x in [24, 16, 8, 0]])
247 return data_bytes
Azim Khan663d4702017-07-07 15:40:26 +0100248
Azim Khanb31aa442018-07-03 11:57:54 +0100249 def test_vector_to_bytes(self, function_id, dependencies, parameters):
Azim Khan663d4702017-07-07 15:40:26 +0100250 """
251 Converts test vector into a byte array that can be sent to the target.
252
Azim Khanf0e42fb2017-08-02 14:47:13 +0100253 :param function_id: Test Function Identifier
Azim Khanb31aa442018-07-03 11:57:54 +0100254 :param dependencies: Dependency list
Azim Khanf0e42fb2017-08-02 14:47:13 +0100255 :param parameters: Test function input parameters
256 :return: Byte array and its length
Azim Khan663d4702017-07-07 15:40:26 +0100257 """
Azim Khanb31aa442018-07-03 11:57:54 +0100258 data_bytes = bytearray([len(dependencies)])
259 if dependencies:
260 data_bytes += bytearray(dependencies)
261 data_bytes += bytearray([function_id, len(parameters)])
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100262 for typ, param in parameters:
263 if typ == 'int' or typ == 'exp':
264 i = int(param)
Azim Khanb31aa442018-07-03 11:57:54 +0100265 data_bytes += 'I' if typ == 'int' else 'E'
266 self.align_32bit(data_bytes)
267 data_bytes += self.int32_to_big_endian_bytes(i)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100268 elif typ == 'char*':
269 param = param.strip('"')
270 i = len(param) + 1 # + 1 for null termination
Azim Khanb31aa442018-07-03 11:57:54 +0100271 data_bytes += 'S'
272 self.align_32bit(data_bytes)
273 data_bytes += self.int32_to_big_endian_bytes(i)
274 data_bytes += bytearray(list(param))
275 data_bytes += '\0' # Null terminate
Azim Khand59391a2017-06-01 14:04:17 +0100276 elif typ == 'hex':
Azim Khanb31aa442018-07-03 11:57:54 +0100277 binary_data = self.hex_str_bytes(param)
278 data_bytes += 'H'
279 self.align_32bit(data_bytes)
280 i = len(binary_data)
281 data_bytes += self.int32_to_big_endian_bytes(i)
282 data_bytes += binary_data
283 length = self.int32_to_big_endian_bytes(len(data_bytes))
284 return data_bytes, length
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100285
286 def run_next_test(self):
287 """
Azim Khan951a2c82018-06-29 03:47:08 +0100288 Fetch next test information and execute the test.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100289
290 """
291 self.test_index += 1
292 self.dep_index = 0
293 if self.test_index < len(self.tests):
Azim Khanb31aa442018-07-03 11:57:54 +0100294 name, function_id, dependencies, args = self.tests[self.test_index]
295 self.run_test(name, function_id, dependencies, args)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100296 else:
Ron Eldor8672cb72018-11-13 18:42:35 +0200297 self.notify_complete(self.suite_passed)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100298
Azim Khanb31aa442018-07-03 11:57:54 +0100299 def run_test(self, name, function_id, dependencies, args):
Azim Khan663d4702017-07-07 15:40:26 +0100300 """
Azim Khan951a2c82018-06-29 03:47:08 +0100301 Execute the test on target by sending next test information.
Azim Khan663d4702017-07-07 15:40:26 +0100302
Azim Khanf0e42fb2017-08-02 14:47:13 +0100303 :param name: Test name
304 :param function_id: function identifier
Azim Khanb31aa442018-07-03 11:57:54 +0100305 :param dependencies: Dependencies list
Azim Khanf0e42fb2017-08-02 14:47:13 +0100306 :param args: test parameters
Azim Khan663d4702017-07-07 15:40:26 +0100307 :return:
308 """
309 self.log("Running: %s" % name)
310
Azim Khanb31aa442018-07-03 11:57:54 +0100311 param_bytes, length = self.test_vector_to_bytes(function_id,
312 dependencies, args)
313 self.send_kv(length, param_bytes)
Azim Khan663d4702017-07-07 15:40:26 +0100314
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100315 @staticmethod
316 def get_result(value):
Azim Khanf0e42fb2017-08-02 14:47:13 +0100317 """
318 Converts result from string type to integer
319 :param value: Result code in string
Azim Khan8d686bf2018-07-04 23:29:46 +0100320 :return: Integer result code. Value is from the test status
321 constants defined under the MbedTlsTest class.
Azim Khanf0e42fb2017-08-02 14:47:13 +0100322 """
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100323 try:
324 return int(value)
325 except ValueError:
Azim Khanb31aa442018-07-03 11:57:54 +0100326 ValueError("Result should return error number. "
327 "Instead received %s" % value)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100328
329 @event_callback('GO')
Azim Khanb31aa442018-07-03 11:57:54 +0100330 def on_go(self, _key, _value, _timestamp):
Azim Khanf0e42fb2017-08-02 14:47:13 +0100331 """
Azim Khan951a2c82018-06-29 03:47:08 +0100332 Sent by the target to start first test.
Azim Khanf0e42fb2017-08-02 14:47:13 +0100333
Azim Khanb31aa442018-07-03 11:57:54 +0100334 :param _key: Event key
335 :param _value: Value. ignored
336 :param _timestamp: Timestamp ignored.
Azim Khanf0e42fb2017-08-02 14:47:13 +0100337 :return:
338 """
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100339 self.run_next_test()
340
341 @event_callback("R")
Azim Khanb31aa442018-07-03 11:57:54 +0100342 def on_result(self, _key, value, _timestamp):
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100343 """
Azim Khan951a2c82018-06-29 03:47:08 +0100344 Handle result. Prints test start, finish required by Greentea
345 to detect test execution.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100346
Azim Khanb31aa442018-07-03 11:57:54 +0100347 :param _key: Event key
Azim Khanf0e42fb2017-08-02 14:47:13 +0100348 :param value: Value. ignored
Azim Khanb31aa442018-07-03 11:57:54 +0100349 :param _timestamp: Timestamp ignored.
Azim Khanf0e42fb2017-08-02 14:47:13 +0100350 :return:
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100351 """
352 int_val = self.get_result(value)
Azim Khanb31aa442018-07-03 11:57:54 +0100353 name, _, _, _ = self.tests[self.test_index]
Azim Khan5e7f8df2017-05-31 20:33:39 +0100354 self.log('{{__testcase_start;%s}}' % name)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100355 self.log('{{__testcase_finish;%s;%d;%d}}' % (name, int_val == 0,
356 int_val != 0))
Ron Eldor8672cb72018-11-13 18:42:35 +0200357 if int_val != 0:
358 self.suite_passed = False
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100359 self.run_next_test()
360
361 @event_callback("F")
Azim Khanb31aa442018-07-03 11:57:54 +0100362 def on_failure(self, _key, value, _timestamp):
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100363 """
Azim Khanf0e42fb2017-08-02 14:47:13 +0100364 Handles test execution failure. That means dependency not supported or
365 Test function not supported. Hence marking test as skipped.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100366
Azim Khanb31aa442018-07-03 11:57:54 +0100367 :param _key: Event key
Azim Khanf0e42fb2017-08-02 14:47:13 +0100368 :param value: Value. ignored
Azim Khanb31aa442018-07-03 11:57:54 +0100369 :param _timestamp: Timestamp ignored.
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100370 :return:
371 """
372 int_val = self.get_result(value)
Mohammad Azim Khan7a0d84f2017-04-01 03:18:20 +0100373 if int_val in self.error_str:
374 err = self.error_str[int_val]
375 else:
376 err = 'Unknown error'
377 # For skip status, do not write {{__testcase_finish;...}}
378 self.log("Error: %s" % err)
379 self.run_next_test()