@@ -0,0 +1,358 @@
+package com.github.davidmoten.util;%0A%0Aimport org.junit.Test;%0A%0Apublic class PreconditionsTest %7B%0A%0A    @Test(expected = NullPointerException.class)%0A    public void testNullThrowsException() %7B%0A        Preconditions.checkNotNull(null);%0A    %7D%0A%0A    @Test%0A    public void testNotNullDoesNotThrowException() %7B%0A        Preconditions.checkNotNull(new Object());%0A    %7D%0A%7D%0A

add Preconditions test