Integer#cmp improve coverage

Author: make-github-pseudonymous-again

test/src/Integer/compare.js

@@ -0,0 +1,9 @@
+import test from 'ava' ;
+
+import { ZZ } from '../../../src' ;
+
+test( 'compare' , t => {
+
+	t.is( ZZ.from(-1).cmp(ZZ.from(1)) , -1 ) ;
+
+} ) ;