Add JTAG related example tests

examples/system/gcov/example_test.py

@@ -0,0 +1,53 @@
+from __future__ import unicode_literals
+from pexpect import TIMEOUT
+from ttfw_idf import Utility
+import os
+import ttfw_idf
+
+
+@ttfw_idf.idf_example_test(env_tag="test_jtag_arm")
+def test_examples_gcov(env, extra_data):
+
+    rel_project_path = os.path.join('examples', 'system', 'gcov')
+    dut = env.get_dut('gcov', rel_project_path)
+    idf_path = dut.app.get_sdk_path()
+    proj_path = os.path.join(idf_path, rel_project_path)
+
+    with ttfw_idf.OCDProcess(os.path.join(proj_path, 'openocd.log')):
+        with ttfw_idf.TelnetProcess(os.path.join(proj_path, 'telnet.log')) as telnet_p:
+            dut.start_app()
+
+            def expect_counter_output(loop, timeout=10):
+                dut.expect_all('blink_dummy_func: Counter = {}'.format(loop),
+                               'some_dummy_func: Counter = {}'.format(loop * 2),
+                               timeout=timeout)
+
+            expect_counter_output(0, timeout=20)
+            dut.expect('Ready to dump GCOV data...', timeout=5)
+
+            def dump_coverage():
+                try:
+                    telnet_p.pexpect_proc.sendline('esp gcov dump')
+                    telnet_p.pexpect_proc.expect_exact('Targets connected.')
+                    telnet_p.pexpect_proc.expect_exact('gcov_example_main.c.gcda')
+                    telnet_p.pexpect_proc.expect_exact('gcov_example_func.c.gcda')
+                    telnet_p.pexpect_proc.expect_exact('some_funcs.c.gcda')
+                    telnet_p.pexpect_proc.expect_exact('Targets disconnected.')
+                except TIMEOUT:
+                    # Print what is happening with DUT. Limit the size if it is in loop and generating output.
+                    Utility.console_log(dut.read(size=1000))
+                    raise
+
+            dump_coverage()
+            dut.expect('GCOV data have been dumped.', timeout=5)
+            expect_counter_output(1)
+            dut.expect('Ready to dump GCOV data...', timeout=5)
+            dump_coverage()
+            dut.expect('GCOV data have been dumped.', timeout=5)
+
+            for i in range(2, 6):
+                expect_counter_output(i)
+
+
+if __name__ == '__main__':
+    test_examples_gcov()