TEST: add BLE example to cmake example json

Author: Qinghao Shi

tools/test/examples/examples_cmake.json

@@ -113,6 +113,31 @@
         ],
         "auto-update" : true
     },
+    {
+      "name": "mbed-os-example-ble",
+      "github":"https://github.com/ARMmbed/mbed-os-example-ble",
+      "sub-repo-example": true,
+      "subs": [
+            "BLE_BatteryLevel",
+            "BLE_GAP",
+            "BLE_GattClient",
+            "BLE_GattServer",
+            "BLE_HeartRate",
+            "BLE_LED",
+            "BLE_LEDBlinker",
+            "BLE_PeriodicAdvertising",
+            "BLE_Privacy",
+            "BLE_SM"
+      ],
+      "features" : [],
+      "targets" : ["NRF52840_DK", "DISCO_L475VG_IOT01A"],
+      "toolchains" : [],
+      "exporters": [],
+      "compile" : true,
+      "export": true,
+      "test" : false,
+      "auto-update" : true
+    },
     {
         "name": "mbed-os-example-kvstore",
         "github":"https://github.com/ARMmbed/mbed-os-example-kvstore",

tools/test/examples/examples_lib.py

@@ -493,6 +493,8 @@ def symlink_mbedos(config, path, exp_filter):
             else:
                 logging.info("Creating Symbolic link '%s'->'mbed-os'" % path)
                 os.symlink(path, "mbed-os")
+                #Cmake tool currently require 'mbed-os.lib' to be present to perform build.
+                #Add a empty 'mbed-os.lib' as a workaround
                 open('mbed-os.lib', 'a').close()
             os.chdir(CWD)
     return 0