examples: Add storage example tests

examples/storage/semihost_vfs/semihost_vfs_example_test.py

@@ -0,0 +1,58 @@
+from io import open
+import os
+import shutil
+import tempfile
+import ttfw_idf
+
+try:
+    from itertools import izip_longest as zip_longest
+except ImportError:
+    # Python 3
+    from itertools import zip_longest
+
+
+@ttfw_idf.idf_example_test(env_tag="test_jtag_arm")
+def test_examples_semihost_vfs(env, extra_data):
+
+    rel_project_path = os.path.join('examples', 'storage', 'semihost_vfs')
+    dut = env.get_dut('semihost_vfs', rel_project_path)
+    idf_path = dut.app.get_sdk_path()
+    proj_path = os.path.join(idf_path, rel_project_path)
+    host_file_name = 'host_file.txt'
+
+    try:
+        temp_dir = tempfile.mkdtemp()
+        host_file_path = os.path.join(proj_path, 'data', host_file_name)
+        shutil.copyfile(host_file_path, os.path.join(temp_dir, host_file_name))
+        openocd_extra_args = '-c \'set ESP_SEMIHOST_BASEDIR {}\''.format(temp_dir)
+
+        with ttfw_idf.OCDProcess(os.path.join(proj_path, 'openocd.log'), openocd_extra_args):
+            dut.start_app()
+            dut.expect_all('example: Switch to semihosted stdout',
+                           'example: Switched back to UART stdout',
+                           'example: Wrote 2798 bytes',
+                           '====================== HOST DATA START =========================',
+                           timeout=20)
+            with open(host_file_path) as f:
+                file_content = [line.strip() for line in f]
+            dut.expect_all(*file_content, timeout=20)
+            dut.expect_all('====================== HOST DATA END =========================',
+                           'example: Read 6121 bytes',
+                           timeout=5)
+
+        with open(os.path.join(temp_dir, 'esp32_stdout.txt')) as f:
+            def expected_content():
+                yield 'example: Switched to semihosted stdout'
+                for i in range(100):
+                    yield 'Semihosted stdout write {}'.format(i)
+                yield 'example: Switch to UART stdout'
+
+            for actual, expected in zip_longest(f, expected_content(), fillvalue='-'):
+                if expected not in actual:  # "in" used because of the printed ASCII color codes
+                    raise RuntimeError('"{}" != "{}"'.format(expected, actual.strip()))
+    finally:
+        shutil.rmtree(temp_dir, ignore_errors=True)
+
+
+if __name__ == '__main__':
+    test_examples_semihost_vfs()