🔍 test: Cover idivmod.

Author: make-github-pseudonymous-again

test/src/Integer/divmod.js

@@ -0,0 +1,27 @@
+import test from 'ava' ;
+
+import { ZZ , ZeroDivisionError } from '../../../src' ;
+
+function macro ( t , a , b , q , r ) {
+	const A = ZZ.from(a) ;
+	const B = ZZ.from(b) ;
+	const [Q, R] = A.idivmod(B) ;
+
+	t.is(q.toString(), Q.toString()) ;
+	t.is(r.toString(), R.toString()) ;
+	t.is(q.toString(), A.toString()) ;
+}
+
+macro.title = ( providedTitle , a , b , q , r ) => `${a} idivmod ${b} = [${q}, ${r}]` ;
+
+test( 'x.idivmod(0) throws' , t => { t.throws( () => ZZ.from(-123).idivmod(ZZ.from(0)) , { instanceOf: ZeroDivisionError } )})
+
+test(macro, 3, 2, 1, 1) ;
+test(macro, '123', 2, 61, 1) ;
+test(macro, 15, 7, 2, 1) ;
+test(macro, 17, 7, 2, 3) ;
+test(macro, 18, 7, 2, 4) ;
+test(macro, 20, 7, 2, 6) ;
+test(macro, 21, 7, 3, 0) ;
+test(macro, 22, 7, 3, 1) ;
+test(macro, 27, 7, 3, 6) ;