🐛 fix(Integer.divround): Fix draft.

Author: make-github-pseudonymous-again

src/Integer.js

@@ -269,7 +269,7 @@ export class Integer {
 
 	divround ( other ) {
 		const [ q , r ] = this.divmod(other) ;
-		if ( r >= ( this.base / 2 | 0 ) ) increment( r , q.limbs , 0 , q.limbs.length ) ;
+		if ( r.ge(other.divn(2).addn(other.iseven() ? 0 : 1)) ) increment( q.base , q.limbs , 0 , q.limbs.length ) ;
 		return q ;
 	}
 

test/src/Integer/divround.js

@@ -0,0 +1,21 @@
+import test from 'ava' ;
+
+import { ZZ , ZeroDivisionError } from '../../../src' ;
+
+function macro ( t , a , b , expected ) {
+	t.is(expected.toString(), ZZ.from(a).divround(ZZ.from(b)).toString()) ;
+}
+
+macro.title = ( providedTitle , a , b , expected ) => `${a} divround ${b} = ${expected}` ;
+
+test( 'x.divround(0) throws' , t => { t.throws( () => ZZ.from(-123).divround(ZZ.from(0)) , { instanceOf: ZeroDivisionError } )})
+
+test(macro, 3, 2, 2) ;
+test(macro, '123', 2, 62) ;
+test(macro, 15, 7, 2) ;
+test(macro, 17, 7, 2) ;
+test(macro, 18, 7, 3) ;
+test(macro, 20, 7, 3) ;
+test(macro, 21, 7, 3) ;
+test(macro, 22, 7, 3) ;
+test(macro, 27, 7, 4) ;