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/Makefile

@@ -0,0 +1,27 @@
+PROGRAM=tests
+
+EXTRA_COMPONENTS=extras/dhcpserver extras/spiffs
+
+PROGRAM_SRC_DIR = . ./cases
+
+FLASH_SIZE = 32
+
+# spiffs configuration
+SPIFFS_BASE_ADDR = 0x200000
+SPIFFS_SIZE = 0x100000
+
+# Add unity test framework headers & core source file
+PROGRAM_INC_DIR = ./unity/src ./fs-test
+PROGRAM_EXTRA_SRC_FILES = ./unity/src/unity.c ./fs-test/fs_test.c
+
+TESTCASE_SRC_FILES = $(wildcard $(PROGRAM_DIR)cases/*.c)
+
+# Do not include source files into a static library because when adding this
+# library with '--whole-archive' linker gives error that archive contains
+# unknown objects (source files)
+INCLUDE_SRC_IN_AR = 0
+
+# Link every object in the 'program' archive, to pick up constructor functions for test cases
+EXTRA_LDFLAGS = -Wl,--whole-archive $(BUILD_DIR)program.a -Wl,--no-whole-archive
+
+include ../common.mk