mock: added I2C functionality

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

tests/mock/i2c_checks_write.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+
+# Author: Alex Tereschenko <alext.mkrs@gmail.com>
+# Copyright (c) 2016 Alex Tereschenko.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import mraa as m
+import unittest as u
+
+from i2c_checks_shared import *
+
+class I2cChecksWrite(u.TestCase):
+  def setUp(self):
+    self.i2c = m.I2c(MRAA_I2C_BUS_NUM)
+
+  def tearDown(self):
+    del self.i2c
+
+  def test_i2c_write_full_reg_range(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN)])
+    self.assertEqual(self.i2c.write(data_to_write),
+                     m.SUCCESS,
+                     "I2C write() of full register range did not return success")
+    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN)
+    self.assertEqual(res,
+                     data_to_write,
+                     "I2C read() after write() of full register range returned unexpected data")
+
+  def test_i2c_write_part_reg_range(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN - 1)])
+    self.assertEqual(self.i2c.write(data_to_write),
+                     m.SUCCESS,
+                     "I2C write() of partial register range did not return success")
+    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN - 1)
+    self.assertEqual(res,
+                     data_to_write,
+                     "I2C read() after write() of partial register range returned unexpected data")
+
+  def test_i2c_write_len_bigger_than_max(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR)
+    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN + 1)])
+    self.assertEqual(self.i2c.write(data_to_write),
+                     m.SUCCESS,
+                     "I2C write() with length bigger than max did not return success")
+    res = self.i2c.read(MRAA_MOCK_I2C_DATA_LEN)
+    self.assertEqual(res,
+                     data_to_write[:-1],
+                     "I2C read() after write() with length bigger than max returned unexpected data")
+
+  def test_i2c_write_invalid_addr(self):
+    self.i2c.address(MRAA_MOCK_I2C_ADDR - 1)
+    data_to_write = bytearray([0xEE for i in range(MRAA_MOCK_I2C_DATA_LEN)])
+    self.assertEqual(self.i2c.write(data_to_write),
+                     m.ERROR_UNSPECIFIED,
+                     "I2C write() to invalid address did not return error")
+
+if __name__ == "__main__":
+  u.main()