tests/Makefile.inc: Add copy-test macro

copy-test macro copies attributes from one test to another. It can be
used to create multiple tests with the same subset of attributes values.

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: I9c9b6b12830c7060ffe5dcf35c9486655cbd08e0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56932
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>

tests/Makefile.inc

@@ -94,6 +94,12 @@ $(if $(findstring $($(1)$(2)-stage), $(stages)),,
 		Check your $(dir $(1)$(2))Makefile.inc))
 endef
 
+# Copy attributes of one test to another.
+# $1 - input test name
+# $2 - output test name
+copy-test = $(foreach attr,$(attributes), \
+		$(eval $(strip $(2))-$(attr) := $($(strip $(1))-$(attr))))
+
 $(call add-special-class, tests)
 $(call evaluate_subdirs)