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'use strict';
require('../common');
const assert = require('assert');
process.env.foo = 'foo';
assert.strictEqual(process.env.foo, 'foo');
process.env.foo = undefined;
assert.strictEqual(process.env.foo, 'undefined');
process.env.foo = 'foo';
assert.strictEqual(process.env.foo, 'foo');
delete process.env.foo;
assert.strictEqual(process.env.foo, undefined);
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