freertos: Migrate kernel tests to test app

This commit renames the "integration" tests to "kernel" test and migrates them
to the test app as a component.

components/freertos/test_apps/freertos/CMakeLists.txt

@@ -4,13 +4,18 @@ cmake_minimum_required(VERSION 3.16)
 # FreeRTOS tests of different types (e.g., kernel, port, performance etc.)are
 # split into different directores in the test app's root directory. Each test
 # type is treated as separate component
-set(test_types)
+set(test_types
+    "kernel")
 
 list(APPEND EXTRA_COMPONENT_DIRS
-     ${test_types}) # Add each test type as a component
+     ${test_types}  # Add each test type as a component
+     "$ENV{IDF_PATH}/tools/unit-test-app/components")   # For test_utils component
 
-# "Trim" the build. Include the minimal set of components, main, and anything it depends on.
-set(COMPONENTS main)
+#"Trim" the build. Include the minimal set of components, main, and anything it depends on.
+# Note: This is commented out for now due to pthread depending on vPortCleanUpTCB provided by "test_freertos_hooks.c".
+# pthread is no used in FreeRTOS unit tests, but is pulled in by esp_system due to another dependency.
+# Todo: Resolve this by either moving the "test_freertos_hooks.c" out, or solving the component dependencies.
+#set(COMPONENTS main)
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(freertos_test)

components/freertos/test_apps/freertos/kernel/CMakeLists.txt

@@ -0,0 +1,26 @@
+# Register all of the "kernel" tests as a component
+
+# For refactored FreeRTOS unit tests, we need to support #include "xxx.h" of FreeRTOS headers
+idf_component_get_property(FREERTOS_ORIG_INCLUDE_PATH freertos ORIG_INCLUDE_PATH)
+
+set(src_dirs
+    "."                 # For freertos_test_utils.c
+    "event_groups"
+    "queue"
+    "stream_buffer"
+    "tasks"
+    "timers")
+
+set(priv_include_dirs
+    "."                                 # For portTestMacro.h
+    "${FREERTOS_ORIG_INCLUDE_PATH}")    # FreeRTOS headers via`#include "xxx.h"`
+
+# In order for the cases defined by `TEST_CASE` in "kernel" to be linked into
+# the final elf, the component can be registered as WHOLE_ARCHIVE
+idf_component_register(SRC_DIRS ${src_dirs}
+                       PRIV_INCLUDE_DIRS ${priv_include_dirs}
+                       PRIV_REQUIRES test_utils esp_timer driver
+                       WHOLE_ARCHIVE)
+
+# Todo: Fix no-format errors
+target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")