Basic tests implemented using cmocka

Makefile

@@ -27,6 +27,9 @@ ASMS = $(C_SOURCES:.c=.s)
 
 all: $(OBJECTS)
 
+test: test/test.elf
+	./test/test.elf
+
 %.o: %.c $(C_HEADERS)
 	@echo "CC $<"
 	@$(CC) $(CFLAGS) -c $< -o $@
@@ -41,6 +44,9 @@ driver: $(OBJECTS)
 run: driver
 	@./driver
 
+test/test.elf: test/test_ringbuf.o ringbuf.o
+	@$(CC) $(CFLAGS) $^ -o $@ -lpthread -lcmocka
+
 lib: $(OBJECTS)
 	@ar rcs librbuf.a ringbuf.o
 
@@ -64,4 +70,4 @@ tidy:
 format:
 	clang-format -i $(C_SOURCES) $(C_HEADERS)
 
-.PHONY: all clean format asm
+.PHONY: all clean format asm test

test/test_ringbuf.c

@@ -0,0 +1,101 @@
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <cmocka.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "ringbuf.h"
+
+/** Tests initialization */
+static void
+test_rb_init_empty(void **state) {
+  struct RingBuf rb;
+  rb_size_t      capacity = 10;
+  rb_size_t      struct_size = sizeof(int);
+
+  rb_init(&rb, capacity, malloc, struct_size);
+
+  assert_int_equal(rb.capacity, capacity);
+  assert_int_equal(rb.count, 0);
+}
+
+/** Tests push_back */
+static void
+test_rb_push_back(void **state) {
+  struct RingBuf rb;
+  rb_size_t      capacity = 10;
+  rb_size_t      struct_size = sizeof(int);
+
+  rb_init(&rb, capacity, malloc, struct_size);
+
+  int data = 10;
+
+  enum WriteResult wr = rb_push_back(&rb, (void *)&data, memcpy);
+  assert_int_equal(wr, WriteOk);
+
+  assert_int_equal(rb.capacity, capacity);
+  assert_int_equal(rb.count, 1);
+}
+
+/** Tests the destroy function */
+static void
+test_rb_init_destroy(void **state) {
+  struct RingBuf rb = { 0, 0, 0, NULL, NULL, NULL, NULL };
+  rb_size_t      capacity = 10;
+  rb_size_t      struct_size = sizeof(int);
+
+  rb_init(&rb, capacity, malloc, struct_size);
+
+  int data = 10;
+
+  rb_push_back(&rb, (void *)&data, memcpy);
+
+  assert_int_equal(rb.capacity, capacity);
+  assert_int_equal(rb.count, 1);
+
+  rb_destroy(&rb, free);
+
+  assert_null(rb.buffer);
+}
+
+/** Tests fill, but not overflow/wrap-around */
+static void
+test_rb_push_back_fill(void **state) {
+  struct RingBuf rb = { 0, 0, 0, NULL, NULL, NULL, NULL };
+  rb_size_t      capacity = 10;
+  rb_size_t      struct_size = sizeof(int);
+
+  rb_init(&rb, capacity, malloc, struct_size);
+
+  const int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+
+  // Insert them all sequentially
+  for(int i = 0; rb_push_back(&rb, &arr[i], memcpy) == WriteOk; i++);
+  assert_int_equal(rb.count, 10);
+  assert_int_equal(rb.capacity, capacity);
+
+  // Read them out and assert expected value
+  for(int i = 0, d = __INT_MAX__; rb_pop_front(&rb, &d, memcpy) == ReadOk;
+      i++) {
+    assert_int_equal(d, arr[i]);
+  }
+
+  assert_int_equal(rb.capacity, capacity);
+  assert_int_equal(rb.count, 0);
+
+  rb_destroy(&rb, free);
+
+  assert_null(rb.buffer);
+}
+
+int
+main(void) {
+  const struct CMUnitTest tests[] = {
+    cmocka_unit_test(test_rb_init_empty),
+    cmocka_unit_test(test_rb_push_back),
+    cmocka_unit_test(test_rb_init_destroy),
+    cmocka_unit_test(test_rb_push_back_fill),
+  };
+
+  return cmocka_run_group_tests(tests, NULL, NULL);
+}