add tests to build system

Makefile

@@ -7,36 +7,51 @@ CFLAGS = -fPIC -g -O2 -std=c99 \
 	-Wold-style-definition \
 	-Woverflow \
 	-Wpointer-arith \
-	-Wstrict-prototypes \
 	-Wunused \
 	-Wvla
 
-LDFLAGS = -g -shared
+LDFLAGS = -g
 LDLIBS =
 
 TARGET_LIB = mulithash.so
 
 SRCS = errors.c
-OBJS = $(subst .c,.o,$(SRCS))
+OBJS = $(SRCS:.c=.o)
 
 all: ${TARGET_LIB} 
 
 $(TARGET_LIB): $(OBJS)
-	$(CC) ${LDFLAGS} -o $@ $^
+	$(CC) -g -shared -o $@ $^
 
-depend: .depend
+# Tests
 
-.depend: $(SRCS)
-	rm -f ./.depend
-	$(CC) $(CFLAGS) -MM $^>>./.depend;
+TEST_SRCS = $(wildcard test/test_*.c)
+TEST_OBJS = $(TEST_SRCS:.c=.o)
+TEST_BINS = $(TEST_OBJS:.o=.out)
+
+PHONY += tests
+tests: $(TEST_BINS)
+	@for t in $^; do               \
+	  echo;                        \
+	  echo '***' "$$t" '***';      \
+	  LD_LIBRARY_PATH=. "./$$t";   \
+	  echo;                        \
+	done
+
+
+test/test_%.out: test/test_%.o $(TARGET_LIB)
+	$(CC) $(LDFLAGS) $(TARGET_LIB) $^ -o $@
+
+# Utils
+
+PHONY += clean dist-clean
 
 clean:
 	$(RM) $(OBJS)
+	$(RM) $(TEST_OBJS)
+	$(RM) $(TEST_BINS)
 	$(RM) $(TARGET_LIB)
 
 dist-clean: clean
-	$(RM) *~ .depend
 
-.PHONY: all depend clean dist-clean
-
-include .depend
+.PHONY: $(PHONY)

errors.h

@@ -6,7 +6,10 @@ typedef enum {
 	MH_E_UNKNOWN_CODE = -1,
 	MH_E_TOO_SHORT = -2,
 	MH_E_TOO_LONG = -3,
-	MH_E_LEN_NOT_SUPPORTED = -4
+	MH_E_LEN_NOT_SUPPORTED = -4,
+
+	// Should be always last, if you are adding error update this code.
+	MH_E_LAST = -5
 } mh_error;
 
 const char *mh_error_string(mh_error code);

test/minunit.h

@@ -0,0 +1,5 @@
+/* vim: set ts=8 sw=8 noexpandtab: */
+#define mu_assert(message, test) do { if (!(test)) return message; } while (0)
+#define mu_run_test(test) do { char *message = test(); tests_run++; \
+	if (message) return message; } while (0)
+extern int tests_run;

test/test_error_string.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <string.h>
+#include "minunit.h"
+
+#include "../errors.h"
+
+int tests_run = 0;
+char error_buf[256];
+
+
+static char *test_error_messages_exist(void) {
+	int i = -1;
+	for (; i > MH_E_LAST; i--) {
+		sprintf(error_buf, "error: code %d has no message", i);
+		mu_assert(error_buf, strlen(mh_error_string((mh_error) i)));
+	}
+
+	return 0;
+}
+
+static char *all_tests(void) {
+	mu_run_test(test_error_messages_exist);
+	return 0;
+}
+
+int main(void) {
+	char *result = all_tests();
+	if (result != 0) {
+		printf("%s\n", result);
+	}
+	else {
+		printf("ALL TESTS PASSED\n");
+	}
+	printf("Tests run: %d\n", tests_run);
+
+	return result != 0;
+}
+