make tests actually work

test/init.c

@@ -2,10 +2,10 @@
 #include <libc.h>
 
 void
-test_init()
+test_init(void)
 {
-	print("testing: init()");
-	print("tests not yet defined");
+	print("testing: init()\n");
+	print("tests not yet defined\n");
 }
 
 //jl

test/init.h

@@ -1,3 +1,3 @@
-extern void test_init();
+extern void test_init(void);
 
 //jl

test/mkfile

@@ -0,0 +1,11 @@
+</$objtype/mkfile
+
+HEADERS=init.h ../init.h
+
+$O.test: test.$O init.$O ../lib.$O
+
+TEST=test
+
+</sys/src/cmd/mktest
+
+#jl

test/test.c

@@ -0,0 +1,13 @@
+#include <u.h>
+#include <libc.h>
+
+#include "init.h"
+
+void
+main()
+{
+	test_init();
+	exits(0);
+}
+
+//jl