diff --git a/tests/io_new b/tests/io_new
new file mode 100755
index 00000000..e9d76d26
Binary files /dev/null and b/tests/io_new differ
diff --git a/tests/io_new.c b/tests/io_new.c
new file mode 100644
index 00000000..224cfc97
--- /dev/null
+++ b/tests/io_new.c
@@ -0,0 +1,18 @@
+
+/*
+ * machinarium.
+ *
+ * Cooperative multitasking engine.
+*/
+
+#include <machinarium.h>
+
+int
+main(int argc, char *argv[])
+{
+	mm_t env = mm_new();
+	mmio_t io = mm_io_new(env);
+	mm_close(io);
+	mm_free(env);
+	return 0;
+}
diff --git a/tests/makefile b/tests/makefile
index 553b25ed..f3305a87 100644
--- a/tests/makefile
+++ b/tests/makefile
@@ -4,10 +4,10 @@ CFLAGS     = -I. -Wall -g -O0 -I../machinarium
 LFLAGS_LIB = ../machinarium/libmachinarium.a
 LFLAGS_LIB_UV = ~/temp/libuv/.libs/libuv.a -pthread
 LFLAGS     = $(LFLAGS_LIB) $(LFLAGS_LIB_UV)
-TESTS      = env create sleep wait cancel_sleep cancel_sleep_2
+TESTS      = new create sleep wait cancel_sleep cancel_sleep_2 io_new
 all: validate clean $(TESTS)
-env:
-	$(CC) $(CFLAGS) env.c $(LFLAGS) -o env
+new:
+	$(CC) $(CFLAGS) new.c $(LFLAGS) -o new
 create:
 	$(CC) $(CFLAGS) create.c $(LFLAGS) -o create
 sleep:
@@ -18,6 +18,8 @@ cancel_sleep:
 	$(CC) $(CFLAGS) cancel_sleep.c $(LFLAGS) -o cancel_sleep
 cancel_sleep_2:
 	$(CC) $(CFLAGS) cancel_sleep_2.c $(LFLAGS) -o cancel_sleep_2
+io_new:
+	$(CC) $(CFLAGS) io_new.c $(LFLAGS) -o io_new
 validate:
 	@if [ ! -f $(LFLAGS_LIB) ]; then \
 		echo ""; \