Add Decimal.isDecimal and config reset

test/modules/clone.js

@@ -105,5 +105,40 @@ T('clone', function () {
   t(new D8(1).constructor !== new D9(1).constructor);
 
   T.assertException(function () { Decimal.clone(null) }, "Decimal.clone(null)");
+
+  // defaults: true
+
+  Decimal.config({
+    precision: 100,
+    rounding: 2,
+    toExpNeg: -100,
+    toExpPos: 200,
+    defaults: true
+  });
+
+  t(Decimal.precision === 100);
+  t(Decimal.rounding === 2);
+  t(Decimal.toExpNeg === -100);
+  t(Decimal.toExpPos === 200);
+  t(Decimal.defaults === undefined);
+
+  D1 = Decimal.clone({ defaults: true });
+
+  t(D1.precision === 20);
+  t(D1.rounding === 4);
+  t(D1.toExpNeg === -7);
+  t(D1.toExpPos === 21);
+  t(D1.defaults === undefined);
+
+  D2 = Decimal.clone({ defaults: true, rounding: 5 });
+
+  t(D2.precision === 20);
+  t(D2.rounding === 5);
+  t(D2.toExpNeg === -7);
+  t(D2.toExpPos === 21);
+
+  D3 = Decimal.clone({ defaults: false });
+
+  t(D3.rounding === 2);
 });
 

test/modules/config.js

@@ -338,5 +338,36 @@ T('config', function () {
 
   t(9, {modulo: void 0});
 
+  // defaults
+
+  t = function (actual) {
+    T.assert(actual);
+  }
+
+  Decimal.config({
+    precision: 100,
+    rounding: 2,
+    toExpNeg: -100,
+    toExpPos: 200,
+  });
+
+  t(Decimal.precision === 100);
+
+  Decimal.config({ defaults: true });
+
+  t(Decimal.precision === 20);
+  t(Decimal.rounding === 4);
+  t(Decimal.toExpNeg === -7);
+  t(Decimal.toExpPos === 21);
+  t(Decimal.defaults === undefined);
+
+  Decimal.rounding = 3;
+
+  Decimal.config({ precision: 50, defaults: true });
+
+  t(Decimal.precision === 50);
+  t(Decimal.rounding === 4);
+
+  // Decimal.set is an alias for Decimal.config
   T.assertEqual(Decimal.set, Decimal.config);
 });

test/modules/isFiniteEtc.js

@@ -1,6 +1,6 @@
 if (typeof T === 'undefined') require('../setup');
 
-T('isFinite, isInteger, isNaN, isNegative, isZero', function () {
+T('isFinite, isInteger, isNaN, isNegative, isZero, isDecimal', function () {
 
   function t(actual) {
     T.assert(actual);
@@ -257,4 +257,22 @@ T('isFinite, isInteger, isNaN, isNegative, isZero', function () {
   t(!new Decimal('0.999999999999999999999').isInteger());
   t(new Decimal('4e4').isInteger());
   t(new Decimal('-4e4').isInteger());
+
+  // Decimal.isDecimal
+
+  t(Decimal.isDecimal(new Decimal(1)));
+  t(Decimal.isDecimal(new Decimal('-2.3')));
+  t(Decimal.isDecimal(new Decimal(NaN)));
+  t(Decimal.isDecimal(new Decimal('Infinity')));
+
+  t(!Decimal.isDecimal());
+  t(!Decimal.isDecimal(0));
+  t(!Decimal.isDecimal(1));
+  t(!Decimal.isDecimal('-2.3'));
+  t(!Decimal.isDecimal(NaN));
+  t(!Decimal.isDecimal(Infinity));
+  t(!Decimal.isDecimal(undefined));
+  t(!Decimal.isDecimal({}));
+  t(!Decimal.isDecimal({isDecimal: true}));
+  t(!Decimal.isDecimal(new Number(4)));
 });