added an x86 test for the ringbuffer

test/Makefile

@@ -0,0 +1,18 @@
+CC=gcc
+CFLAG= -g -O 
+
+tests= test_ringbuffer.test
+objects= ../ringbuffer.o
+
+all: clean $(tests)
+
+clean:
+	-rm $(objects)
+	-rm $(tests)
+
+%.test: %.c $(objects)
+	$(CC) $(CFLAG) $(objects) -o $@ $<
+	./$@
+
+%.o: %.c
+	$(CC) $(CFLAG) -c -o $@ $<

test/test_ringbuffer.c

@@ -0,0 +1,33 @@
+#include <assert.h>
+#include <stdio.h>
+
+#include "../ringbuffer.h"
+
+int main(void)
+{
+	ringbuffer_t buffer = ringbuffer_new(20);
+
+	assert(ringbuffer_nonempty(buffer) == 0);
+
+	assert(ringbuffer_put_char(buffer, 'a') == 0);
+	assert(ringbuffer_nonempty(buffer) == 1);
+	assert(ringbuffer_get_char(buffer) == 'a');
+	assert(ringbuffer_nonempty(buffer) == 0);
+
+	int i;
+	for(i = 0; i < 20; i++)
+	{
+		printf("%d: %c\n", i, 'A' + i);
+		assert(ringbuffer_empty_bytes(buffer) == 20 - i);
+		assert(ringbuffer_put_char(buffer, 'A' + i) == 0);
+	}
+	assert(ringbuffer_nonempty(buffer) == 1);
+	for(i = 0; i < 20; i++)
+	{
+		printf("%d\n", i);
+		assert(ringbuffer_nonempty(buffer) == 1);
+		assert(ringbuffer_get_char(buffer) == 'A' + i);
+	}
+	assert(ringbuffer_nonempty(buffer) == 0);
+	return 0;
+}