add memory_load scenario

JIRA: YARDSTICK-259

This scenario reads memory usage statistics on a Linux host.
memory usage statistics are read using the utility 'free'.

Signed-off-by: JingLu5 <lvjing5@huawei.com>
Change-Id: I677aa65ca264dc77a963bf8b6913a729fbf031be

2 files changed, 99 insertions, 0 deletions

diff --git a/tests/unit/benchmark/scenarios/compute/memload_sample_output.txt b/tests/unit/benchmark/scenarios/compute/memload_sample_output.txt
new file mode 100644
index 000000000..c23917ff7
--- /dev/null
+++ b/tests/unit/benchmark/scenarios/compute/memload_sample_output.txt
@@ -0,0 +1,5 @@
+             total       used       free     shared    buffers     cached
+Mem:     263753976   76737332  187016644       2844     853528   67252400
+-/+ buffers/cache:    8631404  255122572
+Swap:    268029948          0  268029948
+
diff --git a/tests/unit/benchmark/scenarios/compute/test_memload.py b/tests/unit/benchmark/scenarios/compute/test_memload.py
new file mode 100644
index 000000000..cdf518d82
--- /dev/null
+++ b/tests/unit/benchmark/scenarios/compute/test_memload.py
@@ -0,0 +1,94 @@
+#!/usr/bin/env python
+
+##############################################################################
+# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+
+# Unittest for yardstick.benchmark.scenarios.compute.memload.MEMLoad
+
+import mock
+import unittest
+import os
+
+from yardstick.benchmark.scenarios.compute import memload
+
+
+@mock.patch('yardstick.benchmark.scenarios.compute.memload.ssh')
+class MEMLoadTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.ctx = {
+            'host': {
+                'ip': '172.16.0.137',
+                'user': 'root',
+                'key_filename': "mykey.key"
+            }
+        }
+
+        self.result = {}
+
+    def test_memload_successful_setup(self, mock_ssh):
+        m = memload.MEMLoad({}, self.ctx)
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+
+        m.setup()
+        self.assertIsNotNone(m.client)
+        self.assertTrue(m.setup_done)
+
+    def test_execute_command_success(self, mock_ssh):
+        m = memload.MEMLoad({}, self.ctx)
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+        m.setup()
+
+        expected_result = 'abcdefg'
+        mock_ssh.SSH().execute.return_value = (0, expected_result, '')
+        result = m._execute_command("foo")
+        self.assertEqual(result, expected_result)
+
+    def test_execute_command_failed(self, mock_ssh):
+        m = memload.MEMLoad({}, self.ctx)
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+        m.setup()
+
+        mock_ssh.SSH().execute.return_value = (127, '', 'Failed executing \
+                                               command')
+        self.assertRaises(RuntimeError, m._execute_command,
+                          "cat /proc/meminfo")
+
+    def test_get_mem_usage_successful(self, mock_ssh):
+        options = {
+            "interval": 1,
+            "count": 1
+        }
+        args = {"options": options}
+        m = memload.MEMLoad(args, self.ctx)
+        mock_ssh.SSH().execute.return_value = (0, '', '')
+        m.setup()
+
+        output = self._read_file("memload_sample_output.txt")
+        mock_ssh.SSH().execute.return_value = (0, output, '')
+        result = m._get_mem_usage()
+        expected_result = {"max": {"used": 76737332, "cached": 67252400,
+                           "free": 187016644, "shared": 2844,
+                           "total": 263753976, "buffers": 853528},
+                           "average": {"used": 76737332, "cached": 67252400,
+                           "free": 187016644, "shared": 2844,
+                           "total": 263753976, "buffers": 853528},
+                           "free": {"memory0": {"used": "76737332",
+                           "cached": "67252400", "free": "187016644",
+                           "shared": "2844", "total": "263753976",
+                           "buffers": "853528"}}}
+        self.assertEqual(result, expected_result)
+
+    def _read_file(self, filename):
+        curr_path = os.path.dirname(os.path.abspath(__file__))
+        output = os.path.join(curr_path, filename)
+        with open(output) as f:
+            sample_output = f.read()
+        return sample_output
+