tests/gnrc_ipv6_ext_frag: Add Kconfig default configurations

This test needs the pool size for limit objects set to 3 by default so
it does not fail. As this is done with the 'app.config' file, we
explicitly disable Kconfig by default.

tests/gnrc_ipv6_ext_frag/Makefile

@@ -41,6 +41,10 @@ USEMODULE += ps
 # So it cannot currently be run
 TEST_ON_CI_BLACKLIST += all
 
+# As there is an 'app.config' we want to explicitly disable Kconfig by setting
+# the variable to empty
+SHOULD_RUN_KCONFIG ?=
+
 .PHONY: ethos
 
 ethos:

tests/gnrc_ipv6_ext_frag/app.config

@@ -0,0 +1,3 @@
+# This test fails if the pool size is less than 3
+CONFIG_KCONFIG_MODULE_GNRC_IPV6_EXT_FRAG=y
+CONFIG_GNRC_IPV6_EXT_FRAG_LIMITS_POOL_SIZE=3