tests/shell: Add app_metadata to shell tests

Adds app_metadata to the shell test
This both serves as a simple test to see if the module is available
and doesn't crash as well as an example

sys/Makefile.include

@@ -32,7 +32,10 @@ ifneq (,$(filter oneway_malloc,$(USEMODULE)))
 endif
 
 ifneq (,$(filter app_metadata,$(USEMODULE)))
-  # Overwrite the interface version
+  # Overwrite the application shell formats.
+  # This is an optional macro that can be used to coordinate
+  # standardized shell formats, as an example it can point to an RDM
+  # that specifies semantics.
   ifdef APP_SHELL_FMT
     CFLAGS += -DAPP_SHELL_FMT=\"$(APP_SHELL_FMT)\"
   endif

sys/include/app_metadata.h

@@ -33,9 +33,9 @@ extern "C" {
  *          say semantics defined in a RDM or schema, that could be specified
  *          by adding APP_SHELL_FMT="RDM001_v1", that would inform anything
  *          using the shell that the formatting should follow what is dictated.
- *          This define is only for documentation, to use the APP_SHELL_FMT
- *          add it to the application makefile with APP_SHELL_FMT=<your value>
- *          or when calling make such as `APP_SHELL_FMT=<your value> make flash`
+ * @note    This define is only for documentation, to use the APP_SHELL_FMT
+ *          add it to the application makefile with APP_SHELL_FMT=your_value
+ *          or when calling make such as `APP_SHELL_FMT=your_value make flash`
  */
 #define APP_SHELL_FMT
 #endif

tests/shell/Makefile

@@ -1,6 +1,7 @@
 DEVELHELP=0
 include ../Makefile.tests_common
 
+USEMODULE += app_metadata
 USEMODULE += shell
 USEMODULE += shell_commands
 USEMODULE += ps
@@ -10,6 +11,11 @@ DISABLE_MODULE += auto_init
 # chronos is missing a getchar implementation
 BOARD_BLACKLIST += chronos
 
+BOARD_INSUFFICIENT_MEMORY := arduino-duemilanove \
+                             arduino-uno
+
 TEST_ON_CI_WHITELIST += all
 
+APP_SHELL_FMT ?= NONE
+
 include $(RIOTBASE)/Makefile.include

tests/shell/tests/01-run.py

@@ -17,7 +17,8 @@ EXPECTED_HELP = (
     'end_test             ends a test',
     'echo                 prints the input command',
     'reboot               Reboot the node',
-    'ps                   Prints information about running threads.'
+    'ps                   Prints information about running threads.',
+    'app_metadata         Returns application metadata'
 )
 
 EXPECTED_PS = (