utest: move testcases of Utest from example to Utest folder

Create unit-test-cases for the Utest framework subsystem
according to "How to add utest cases into RT-Thread for your module." [1]

Link:
https://rt-thread.github.io/rt-thread/page_component_utest.html#autotoc_md804
[1]

The original `components/utilities/utest` directory already has unit
testcases, which are more comprehensive than the testcases in
`examples/utest/testcases/utest/`. Therefore, simply deleted
the test cases in `examples` and used the existing testcases
in the utest framework.

Signed-off-by: Chen Wang <[email protected]>

Author: unicornx

Kconfig.utestcases

@@ -7,7 +7,7 @@ config RT_USING_UTESTCASES
 
 if RT_USING_UTESTCASES
 
-rsource "examples/utest/testcases/utest/Kconfig"
+rsource "components/utilities/utest/utest/Kconfig"
 rsource "examples/utest/testcases/kernel/Kconfig"
 rsource "examples/utest/testcases/cpp11/Kconfig"
 rsource "examples/utest/testcases/drivers/serial_v2/Kconfig"

components/utilities/utest/SConscript

@@ -5,4 +5,9 @@ src     = Glob('*.c')
 CPPPATH = [cwd]
 group   = DefineGroup('UTest', src, depend = ['RT_USING_UTEST'], CPPPATH = CPPPATH)
 
+list = os.listdir(cwd)
+for item in list:
+    if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
+        group = group + SConscript(os.path.join(item, 'SConscript'))
+
 Return('group')

components/utilities/utest/utest/Kconfig

@@ -0,0 +1,8 @@
+menu "Utest Self Testcase"
+
+config UTEST_SELF_PASS_TC
+    bool "UTEST Self-test"
+    select RT_USING_UTEST
+    default n
+
+endmenu

components/utilities/utest/utest/SConscript

@@ -0,0 +1,10 @@
+from building import *
+
+src = []
+
+if GetDepend('RT_UTEST_USING_ALL_CASES') or GetDepend('UTEST_SELF_PASS_TC'):
+    src += Glob('TC_*.c')
+
+group = DefineGroup('utc_UTest', src, depend = [''])
+
+Return('group')