use port 3000 by default, to match the Express default port and not collide...

use port 3000 by default, to match the Express default port and not collide with services on CI host
7 jobs for master
Status Job ID Name Coverage
  Test
passed #19
Build

00:00:25

passed #13
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00:00:16

failed #14
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00:00

failed #15
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00:00:01

failed #16
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00:00

failed #17
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00:00

failed #18
Build

00:00:01