Add test case for #1941.

Add test for the false-positives from #1942.
Fix test-sys.js.

test/simple/test-sys.js

@@ -37,7 +37,7 @@ assert.equal('Sun, 14 Feb 2010 11:48:40 GMT',
 assert.equal("'\\n\\u0001'", common.inspect('\n\u0001'));
 
 assert.equal('[]', common.inspect([]));
-assert.equal('[]', common.inspect(Object.create([])));
+assert.equal('{}', common.inspect(Object.create([])));
 assert.equal('[ 1, 2 ]', common.inspect([1, 2]));
 assert.equal('[ 1, [ 2, 3 ] ]', common.inspect([1, [2, 3]]));
 
@@ -91,9 +91,6 @@ assert.equal('{ writeonly: [Setter] }',
 var value = {};
 value['a'] = value;
 assert.equal('{ a: [Circular] }', common.inspect(value));
-value = Object.create([]);
-value.push(1);
-assert.equal('[ 1, length: 1 ]', common.inspect(value));
 
 // Array with dynamic properties
 value = [1, 2, 3];

test/simple/test-util-inspect.js

@@ -53,9 +53,12 @@ try {
   assert.equal(util.inspect(e), '[ReferenceError: undef is not defined]');
 }
 var ex = util.inspect(new Error('FAIL'), true);
-console.log(ex);
 assert.ok(ex.indexOf('[Error: FAIL]') != -1);
 assert.ok(ex.indexOf('[stack]') != -1);
 assert.ok(ex.indexOf('[message]') != -1);
 assert.ok(ex.indexOf('[arguments]') != -1);
 assert.ok(ex.indexOf('[type]') != -1);
+
+// GH-1941
+// should not throw:
+assert.equal(util.inspect(Object.create(Date.prototype)), '{}')

test/simple/test-util.js

@@ -36,6 +36,7 @@ assert.equal(false, util.isArray({}))
 assert.equal(false, util.isArray({ push: function () {} }))
 assert.equal(false, util.isArray(/regexp/))
 assert.equal(false, util.isArray(new Error))
+assert.equal(false, util.isArray(Object.create(Array.prototype)))
 
 // isRegExp
 assert.equal(true, util.isRegExp(/regexp/))
@@ -45,6 +46,7 @@ assert.equal(true, util.isRegExp(context('RegExp')()))
 assert.equal(false, util.isRegExp({}))
 assert.equal(false, util.isRegExp([]))
 assert.equal(false, util.isRegExp(new Date()))
+assert.equal(false, util.isRegExp(Object.create(RegExp.prototype)))
 
 // isDate
 assert.equal(true, util.isDate(new Date()))
@@ -54,6 +56,7 @@ assert.equal(false, util.isDate(Date()))
 assert.equal(false, util.isDate({}))
 assert.equal(false, util.isDate([]))
 assert.equal(false, util.isDate(new Error))
+assert.equal(false, util.isDate(Object.create(Date.prototype)))
 
 // isError
 assert.equal(true, util.isError(new Error))
@@ -65,3 +68,4 @@ assert.equal(true, util.isError(new (context('SyntaxError'))))
 assert.equal(false, util.isError({}))
 assert.equal(false, util.isError({ name: 'Error', message: '' }))
 assert.equal(false, util.isError([]))
+assert.equal(false, util.isError(Object.create(Error.prototype)))