add spec tests

tests/suite/Makefile

@@ -0,0 +1,22 @@
+.POSIX:
+
+.SUFFIXES: .test .rs
+
+TEST=$(shell find . -name '*.test' | sort)
+TEST_RS=${TEST:.test=.rs}
+
+.PHONY: suite
+suite: mod.rs
+
+mod.rs: ${TEST_RS}
+	printf "" > $@
+	for f in ${TEST}; do \
+		name=$$(basename -s .test $$f); \
+		echo "mod $$name;" >> $@; \
+	done
+
+.test.rs:
+	awk -fgen.awk $< > $@
+
+clean:
+	rm -f *.rs