Add initial hardware testing support (#6313)

- Added workflow triggered by cron or label "hil_test"
- Added examples with both pytest and unity

tests/.gitignore

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+build/
+__pycache__/

tests/hello_world/hello_world.ino

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+void setup(){
+  // Open serial communications and wait for port to open:
+  Serial.begin(115200);
+  while (!Serial) {
+    ;
+  }
+
+  Serial.println("Hello Arduino!");
+}
+
+void loop(){
+}

tests/hello_world/test_hello_world.py

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+def test_hello_world(dut):
+    dut.expect('Hello Arduino!')

tests/pytest.ini

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+[pytest]
+addopts = --embedded-services esp,arduino
+
+# log related
+log_cli = True
+log_cli_level = INFO
+log_cli_format = %(asctime)s %(levelname)s %(message)s
+log_cli_date_format = %Y-%m-%d %H:%M:%S
+
+log_file = test.log
+log_file_level = INFO
+log_file_format = %(asctime)s %(levelname)s %(message)s
+log_file_date_format = %Y-%m-%d %H:%M:%S

tests/requirements.txt

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+pyserial>=3.0
+esptool>=3.1
+pytest-cov
+cryptography<3.4; platform_machine == "armv7l"
+
+pytest>=6.2.0
+pexpect>=4.4
+
+pytest-embedded>=0.5.1
+pytest-embedded-serial>=0.5.1
+pytest-embedded-serial-esp>=0.5.1
+pytest-embedded-arduino>=0.5.1
+

tests/unity/test_unity.py

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+def test_unity(dut):
+    dut.expect_unity_test_output(timeout=240)

tests/unity/unity.ino

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+#include <unity.h>
+
+
+/* These functions are intended to be called before and after each test. */
+void setUp(void) {
+}
+
+void tearDown(void){
+}
+
+
+void test_pass(void){
+  TEST_ASSERT_EQUAL(1, 1);
+}
+
+void test_fail(void){
+  TEST_ASSERT_EQUAL(1, 1);
+}
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) {
+    ;
+  }
+  
+  UNITY_BEGIN();
+  RUN_TEST(test_pass);
+  RUN_TEST(test_fail);
+  UNITY_END();
+}
+
+void loop() {
+}