🔍 test: Test Integer.divides().

Author: make-github-pseudonymous-again

test/src/Integer/divides.js

@@ -0,0 +1,20 @@
+import test from 'ava' ;
+import { ZZ , ZeroDivisionError } from '../../../src' ;
+
+function macro ( t , a , b , expected ) {
+	t.is(expected, ZZ.from(a).divides(ZZ.from(b))) ;
+}
+
+macro.title = ( providedTitle , a , b , expected ) => expected ? `${a} divides ${b}` : `${a} does not divide ${b}` ;
+
+test( 'zero.divides(x) throws' , t => { t.throws( () => ZZ.$0().divides(ZZ.from(1)) , { instanceOf: ZeroDivisionError } )})
+
+test( macro , 2 , 4 , true ) ;
+test( macro , 7 , 14 , true ) ;
+test( macro , 1 , '290843274237498327402783497239472937493274092479327' , true ) ;
+test( macro , -1 , '290843274237498327402783497239472937493274092479327' , true ) ;
+test( macro , 1 , '-290843274237498327402783497239472937493274092479327' , true ) ;
+test( macro , -1 , '-290843274237498327402783497239472937493274092479327' , true ) ;
+
+test( macro , 2 , 3 , false ) ;
+test( macro , 4 , 2 , false ) ;