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Enforce arguments constraint reflexively #102

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Enforce arguments constraint reflexively #102

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9 changes: 5 additions & 4 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -929,10 +929,11 @@
if (a.prototype !== b.prototype) return false;
//~~~I've managed to break Object.keys through screwy arguments passing.
// Converting to array solves the problem.
if (isArguments(a)) {
if (!isArguments(b)) {
return false;
}
var aIsArgs = isArguments(a),
bIsArgs = isArguments(b);
if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
return false;
if (aIsArgs) {
a = pSlice.call(a);
b = pSlice.call(b);
return expect.eql(a, b);
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8 changes: 8 additions & 0 deletions test/expect.js
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Original file line number Diff line number Diff line change
Expand Up @@ -312,6 +312,14 @@ describe('expect', function () {
expect('4').to.eql(4);
expect(/a/gmi).to.eql(/a/mig);

err(function() {
expect([]).to.eql(arguments);
}, 'expected [] to sort of equal {}');

err(function() {
expect(arguments).to.eql([]);
}, 'expected {} to sort of equal []');

err(function () {
expect(4).to.eql(3);
}, 'expected 4 to sort of equal 3');
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