webassembly/Makefile: Add test//% target.

Following a69425b, this is a convenient
way to run a subset of tests.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

ports/webassembly/Makefile

@@ -130,7 +130,7 @@ OBJ += $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
 ################################################################################
 # Main targets.
 
-.PHONY: all repl min test test_min
+.PHONY: all repl min test test//% test_min
 
 all: $(BUILD)/micropython.mjs
 
@@ -150,6 +150,9 @@ min: $(BUILD)/micropython.min.mjs
 test: $(BUILD)/micropython.mjs $(TOP)/tests/run-tests.py
 	cd $(TOP)/tests && MICROPY_MICROPYTHON_MJS=../ports/webassembly/$< ./run-tests.py -t webassembly
 
+test//%: $(BUILD)/micropython.mjs $(TOP)/tests/run-tests.py
+	cd $(TOP)/tests && MICROPY_MICROPYTHON_MJS=../ports/webassembly/$< ./run-tests.py -t webassembly -i "$*"
+
 test_min: $(BUILD)/micropython.min.mjs $(TOP)/tests/run-tests.py
 	cd $(TOP)/tests && MICROPY_MICROPYTHON_MJS=../ports/webassembly/$< ./run-tests.py -t webassembly