isNatural tests

Author: mikera

convex-core/src/test/java/convex/core/lang/NumericsTest.java

@@ -463,17 +463,21 @@ public static void doIntegerTests(AInteger a) {
 		assertEquals(a.abs(),RT.multiply(signum,a));
 		if (signum.equals(CVMLong.ONE)) {
 			assertTrue(a.isPositive());
+			assertTrue(a.isNatural());
 		} else if (signum.equals(CVMLong.MINUS_ONE)) {
 			assertTrue(a.isNegative());
+			assertFalse(a.isNatural());
 		} else {
 			assertTrue(a.isZero());
+			assertTrue(a.isNatural());
 		}
 
 		doGenericNumberTests(a);
 	}
 
 	public static void doDoubleTests(CVMDouble a) {
 		CVMDouble signum = a.signum();
+		assertFalse(a.isNatural());
 		assertEquals(a.abs(),RT.multiply(signum,a));
 
 		assertEquals(Math.signum(a.doubleValue()),signum.doubleValue());