tests: add testsuite

Makefile

@@ -1,7 +1,7 @@
 CC = gcc
 CPPFLAGS = -Isrc/ -D_POSIX_C_SOURCE=200809L
-VPATH = src/
 CFLAGS = -Wall -Wextra -pedantic -Werror -std=c99
+VPATH = src/ tests/
 USE_CLIMBING = 1
 
 SRC = \
@@ -16,7 +16,20 @@ all: $(BIN)
 $(BIN):
 $(BIN): $(OBJ) src/pratt.o
 
+check: testsuite
+	./testsuite --verbose
+
+TEST_SRC = \
+    tests/testsuite.c \
+
+TEST_OBJ = $(TEST_SRC:.c=.o)
+
+testsuite: LDFLAGS+=-lcriterion -fsanitize=address
+testsuite: CFLAGS+=-fsanitize=address
+testsuite: $(OBJ) $(TEST_OBJ)
+
 .PHONY: clean
 clean:
 	$(RM) $(OBJ) # remove object files
 	$(RM) $(BIN) # remove main program
+	$(RM) testsuite