examples: Add storage example tests

examples/storage/spiffs/spiffs_example_test.py

@@ -0,0 +1,22 @@
+import re
+import ttfw_idf
+
+
+@ttfw_idf.idf_example_test(env_tag='Example_WIFI')
+def test_examples_spiffs(env, extra_data):
+
+    dut = env.get_dut('spiffs', 'examples/storage/spiffs')
+    dut.start_app()
+    dut.expect_all('example: Initializing SPIFFS',
+                   re.compile(r'example: Partition size: total: \d+, used: \d+'),
+                   'example: Opening file',
+                   'example: File written',
+                   'example: Renaming file',
+                   'example: Reading file',
+                   'example: Read from file: \'Hello World!\'',
+                   'example: SPIFFS unmounted',
+                   timeout=20)
+
+
+if __name__ == '__main__':
+    test_examples_spiffs()