Unit testing for esp-open-rtos (#253)

* Get testing system by projectgus working with master HEAD

* Fix running dual test. Add basic wifi test

* Moved spiff test to a test case. Reset retries in test runner

* Add timers test case

* test_runner: List test cases and run individual test cases

* Add README for tests

* Update README.md

* Code clean-up

* Python3.4 support. README.md update

tests/include/testcase.h

@@ -0,0 +1,59 @@
+#ifndef _TESTCASE_H
+#define _TESTCASE_H
+#include <stdbool.h>
+#include <stdio.h>
+#include "esp/uart.h"
+
+/* Unity is the framework with test assertions, etc. */
+#include "unity.h"
+
+/* Need to explicitly flag once a test has completed successfully. */
+#undef TEST_PASS
+#define TEST_PASS() do { UnityConcludeTest(); while(1) { } } while (0)
+
+/* Types of test, defined by hardware requirements */
+typedef enum {
+    SOLO,        /* Test require "ESP A" only, no other connections */
+    DUAL,        /* Test requires "ESP A" and "ESP "B", basic interconnections between them */
+    EYORE_TEST,  /* Test requires an eyore-test board with onboard STM32F0 */
+} testcase_type_t;
+
+typedef void (testcase_fn_t)(void);
+
+typedef struct {
+    const char *name;
+    const char *file;
+    int line;
+    testcase_type_t type;
+    testcase_fn_t *a_fn;
+    testcase_fn_t *b_fn;
+} testcase_t;
+
+void testcase_register(const testcase_t *testcase);
+
+/* Register a test case using these macros. Use DEFINE_SOLO_TESTCASE for single-MCU tests,
+   and DEFINE_TESTCASE for all other test types.
+*/
+#define DEFINE_SOLO_TESTCASE(NAME)                                      \
+    static testcase_fn_t a_##NAME;                                      \
+    _DEFINE_TESTCASE_COMMON(NAME, SOLO, a_##NAME, 0)
+
+#define DEFINE_TESTCASE(NAME, TYPE)                                     \
+    static testcase_fn_t a_##NAME;                                      \
+    static testcase_fn_t b_##NAME;                                      \
+    _DEFINE_TESTCASE_COMMON(NAME, TYPE, a_##NAME, b_##NAME)
+
+
+#define _DEFINE_TESTCASE_COMMON(NAME, TYPE, A_FN, B_FN)                 \
+    void __attribute__((constructor)) testcase_ctor_##NAME() {          \
+        const testcase_t testcase = { .name = #NAME,                    \
+                                      .file = __FILE__,                 \
+                                      .line = __LINE__,                 \
+                                      .type = TYPE,                     \
+                                      .a_fn = A_FN,                     \
+                                      .b_fn = B_FN,                     \
+        };                                                              \
+        testcase_register(&testcase);                                   \
+    }
+
+#endif