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zjsunit: Restore missing fields correctly in with_field.

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Signed-off-by: Anders Kaseorg <anders@zulip.com>
This commit is contained in:
Anders Kaseorg
2021-02-22 19:54:34 -08:00
committed by Anders Kaseorg
parent 58b18fd499
commit 3ccb4391d8
1 changed files with 6 additions and 1 deletions
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5
frontend_tests/zjsunit/namespace.js
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@@ -67,12 +67,17 @@ exports.restore = function () {
}; };
exports.with_field = function (obj, field, val, f) { exports.with_field = function (obj, field, val, f) {
const had_val = Object.prototype.hasOwnProperty.call(obj, field);
const old_val = obj[field]; const old_val = obj[field];
try { try {
obj[field] = val; obj[field] = val;
return f(); return f();
} finally { } finally {
if (had_val) {
obj[field] = old_val; obj[field] = old_val;
} else {
delete obj[field];
}
} }
}; };