text: /**** SETUP & UTILITY STUFF ****/
  
  
  var db
    , testBuffer
    , test
    , verifyNotFoundError = require('./util').verifyNotFoundError
    , isTypedArray        = require('./util').isTypedArray
  
  function makeGetDelErrorTests (type, key, expectedError) {
    test('test get() with ' + type + ' causes error', function (t) {
      db.get(key, function (err) {
        t.ok(err, 'has error')
        t.ok(err instanceof Error)
        t.ok(err.message.match(expectedError), 'correct error message')
        t.end()
      })
    })
  
    test('test del() with ' + type + ' causes error', function (t) {
      db.del(key, function (err) {
        t.ok(err, 'has error')
        t.ok(err instanceof Error)
        t.ok(err.message.match(expectedError), 'correct error message')
        t.end()
      })
    })
  }
  
  function makePutErrorTest (type, key, value, expectedError) {
    test('test put() with ' + type + ' causes error', function (t) {
      db.put(key, value, function (err) {
        t.ok(err, 'has error')
        t.ok(err instanceof Error)
        t.ok(err.message.match(expectedError), 'correct error message')
        t.end()
      })
    })
  }
  
  function makePutGetDelSuccessfulTest (type, key, value) {
    test('test put()/get()/del() with ' + type, function (t) {
      db.put(key, value, function (err) {
        t.notOk(err, 'no error')
        db.get(key, function (err, _value) {
          t.notOk(err, 'no error, has key/value for `' + key + '`')
          t.ok(Buffer.isBuffer(_value), 'is a Buffer')
          var result = _value.toString()
          value = value.toString()
          t.equals(result, value)
          db.del(key, function (err) {
            t.notOk(err, 'no error, deleted key/value for `' + key + '`')
            db.get(key, function (err,  value) {
              t.ok(err, 'entry propertly deleted')
              t.ok(verifyNotFoundError(err), 'should have correct error message')
              t.ok(typeof value == 'undefined', 'value is undefined')
              t.end()
            })
          })
        })
      })
    })
  }
  
  function makeErrorKeyTest (type, key, expectedError) {
    makeGetDelErrorTests(type, key, expectedError)
    makePutErrorTest(type, key, 'foo', expectedError)
  }
  
  /**** SETUP ENVIRONMENT ****/
  
  module.exports.setUp = function (leveldown, test, testCommon) {
    test('setUp common', testCommon.setUp)
    test('setUp db', function (t) {
      db = leveldown(testCommon.location())
      db.open(t.end.bind(t))
    })
  }
  
  /**** TEST ERROR KEYS ****/
  
  module.exports.errorKeys = function (testFunc, BufferType) {
    if (!BufferType) BufferType = Buffer
    test = testFunc
    makeErrorKeyTest('null key', null, /key cannot be `null` or `undefined`/)
    makeErrorKeyTest('undefined key', undefined, /key cannot be `null` or `undefined`/)
    makeErrorKeyTest('empty String key', '', /key cannot be an empty String/)
    makeErrorKeyTest('empty Buffer key', new BufferType(0), /key cannot be an empty \w*Buffer/)
    makeErrorKeyTest('empty Array key', [], /key cannot be an empty String/)
  }
  
  /**** TEST NON-ERROR KEYS ****/
  
  module.exports.nonErrorKeys = function (testFunc) {
    // valid falsey keys
    test = testFunc
    makePutGetDelSuccessfulTest('`false` key', false, 'foo false')
    makePutGetDelSuccessfulTest('`0` key', 0, 'foo 0')
    makePutGetDelSuccessfulTest('`NaN` key', NaN, 'foo NaN')
  
    // standard String key
    makePutGetDelSuccessfulTest(
        'long String key'
      , 'some long string that I\'m using as a key for this unit test, cross your fingers dude, we\'re going in!'
      , 'foo'
    )
  
    if (!process.browser) {
      // Buffer key
      makePutGetDelSuccessfulTest('Buffer key', testBuffer, 'foo')
    }
  
    // non-empty Array as a value
    makePutGetDelSuccessfulTest('Array value', 'foo', [1,2,3,4])
  }
  
  /**** TEST ERROR VALUES ****/
  
  module.exports.errorValues = function (testFunc, BufferType) {
    if (!BufferType) BufferType = Buffer
    test = testFunc
    makePutErrorTest('null value', 'foo', null, /value cannot be `null` or `undefined`/)
    makePutErrorTest('undefined value', 'foo', undefined, /value cannot be `null` or `undefined`/)
    makePutErrorTest('empty String value', 'foo', '', /value cannot be an empty String/)
    makePutErrorTest('empty Buffer value', 'foo', new BufferType(0), /value cannot be an empty \w*Buffer/)
    makePutErrorTest('empty Array value', 'foo', [], /value cannot be an empty String/)
  }
  
  module.exports.nonErrorKeys = function (testFunc) {
    // valid falsey values
    test = testFunc
    makePutGetDelSuccessfulTest('`false` value', 'foo false', false)
    makePutGetDelSuccessfulTest('`0` value', 'foo 0', 0)
    makePutGetDelSuccessfulTest('`NaN` value', 'foo NaN', NaN)
  
    // standard String value
    makePutGetDelSuccessfulTest(
        'long String value'
      , 'foo'
      , 'some long string that I\'m using as a key for this unit test, cross your fingers dude, we\'re going in!'
    )
  
    // standard Buffer value
    makePutGetDelSuccessfulTest('Buffer value', 'foo', testBuffer)
  
    // non-empty Array as a key
    makePutGetDelSuccessfulTest('Array key', [1,2,3,4], 'foo')
  }
  
  /**** CLEANUP ENVIRONMENT ****/
  
  module.exports.tearDown = function (test, testCommon) {
    test('tearDown', function (t) {
      db.close(testCommon.tearDown.bind(null, t))
    })
  }
  
  module.exports.all = function (leveldown, testFunc, testCommon, buffer, BufferType) {
    testBuffer = buffer
    test = testFunc
    module.exports.setUp(leveldown, test, testCommon)
    module.exports.errorKeys(test, BufferType)
    module.exports.nonErrorKeys(test)
    module.exports.errorValues(test, BufferType)
    module.exports.nonErrorKeys(test)
    module.exports.tearDown(test, testCommon)
  }
  