git ssb

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var test = require('tape')
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// currently only these types support onListen/unlisten
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// in the future, all types should allow it!
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var types = [
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  function array (opts) {
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    return require('../array')([], opts)
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  },
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  function dict (opts) {
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    return require('../dict')({}, opts)
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  },
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  function map (opts) {
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    return require('../map')([], () => {}, opts)
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  },
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  function computed (opts) {
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    return require('../computed')({}, () => {}, opts)
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  }
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]
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types.forEach(ctor => {
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  test(`${ctor.name} - onListen / onUnlisten`, t => {
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    var onListenCount = 0
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    var onUnlistenCount = 0
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    var onListenReleaseCount = 0
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    var obs = ctor({
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      onListen: () => {
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        onListenCount += 1
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        return () => {
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          onListenReleaseCount += 1
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        }
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      },
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      onUnlisten: () => {
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        onUnlistenCount += 1
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      }
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    })
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    t.equal(onListenCount, 0)
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    var unlisten1 = obs(() => {})
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    t.equal(onListenCount, 1)
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    var unlisten2 = obs(() => {})
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    t.equal(onListenCount, 1) // should still be 1
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    unlisten1()
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    t.equal(onUnlistenCount, 0)
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    unlisten2()
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    t.equal(onUnlistenCount, 1)
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    t.equal(onListenReleaseCount, 1)
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    var unlisten3 = obs(() => {})
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    t.equal(onListenCount, 2)
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    unlisten3()
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    t.equal(onUnlistenCount, 2)
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    t.equal(onListenReleaseCount, 2)
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    t.end()
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  })
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})
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