node-postgres/test/unit/utils-tests.js

var helper = require(__dirname + '/test-helper');
var utils = require(__dirname + "/../../lib/utils");
var defaults = require(__dirname + "/../../lib").defaults;


test('ensure types is exported on root object', function() {
  var pg = require('../../lib')
  assert(pg.types)
  assert(pg.types.getTypeParser)
  assert(pg.types.setTypeParser)
})

//this tests the monkey patching
//to ensure comptability with older
//versions of node
test("EventEmitter.once", function(t) {

  //an event emitter
  var stream = new MemoryStream();

  var callCount = 0;
  stream.once('single', function() {
    callCount++;
  });

  stream.emit('single');
  stream.emit('single');
  assert.equal(callCount, 1);
});


test('normalizing query configs', function() {
  var config
  var callback = function () {}

  config = utils.normalizeQueryConfig({text: 'TEXT'})
  assert.same(config, {text: 'TEXT'})

  config = utils.normalizeQueryConfig({text: 'TEXT'}, [10])
  assert.deepEqual(config, {text: 'TEXT', values: [10]})

  config = utils.normalizeQueryConfig({text: 'TEXT', values: [10]})
  assert.deepEqual(config, {text: 'TEXT', values: [10]})

  config = utils.normalizeQueryConfig('TEXT', [10], callback)
  assert.deepEqual(config, {text: 'TEXT', values: [10], callback: callback})

  config = utils.normalizeQueryConfig({text: 'TEXT', values: [10]}, callback)
  assert.deepEqual(config, {text: 'TEXT', values: [10], callback: callback})
})

test('prepareValues: buffer prepared properly', function() {
  var buf = new Buffer("quack");
  var out = utils.prepareValue(buf);
  assert.strictEqual(buf, out);
});

test('prepareValues: date prepared properly', function() {
  helper.setTimezoneOffset(-330);

  var date = new Date(2014, 1, 1, 11, 11, 1, 7);
  var out = utils.prepareValue(date);
  assert.strictEqual(out, "2014-02-01T11:11:01.007+05:30");

  helper.resetTimezoneOffset();
});

test('prepareValues: date prepared properly as UTC', function() {
  defaults.parseInputDatesAsUTC = true;

  // make a date in the local timezone that represents a specific UTC point in time
  var date = new Date(Date.UTC(2014, 1, 1, 11, 11, 1, 7));
  var out = utils.prepareValue(date);
  assert.strictEqual(out, "2014-02-01T11:11:01.007+00:00");

  defaults.parseInputDatesAsUTC = false;
});

test('prepareValues: undefined prepared properly', function() {
  var out = utils.prepareValue(void 0);
  assert.strictEqual(out, null);
});

test('prepareValue: null prepared properly', function() {
  var out = utils.prepareValue(null);
  assert.strictEqual(out, null);
});

test('prepareValue: true prepared properly', function() {
  var out = utils.prepareValue(true);
  assert.strictEqual(out, 'true');
});

test('prepareValue: false prepared properly', function() {
  var out = utils.prepareValue(false);
  assert.strictEqual(out, 'false');
});

test('prepareValue: number prepared properly', function () {
  var out = utils.prepareValue(3.042);
  assert.strictEqual(out, '3.042');
});

test('prepareValue: string prepared properly', function() {
  var out = utils.prepareValue('big bad wolf');
  assert.strictEqual(out, 'big bad wolf');
});

test('prepareValue: simple array prepared properly', function() {
  var out = utils.prepareValue([1, null, 3, undefined, [5, 6, "squ,awk"]]);
  assert.strictEqual(out, '{"1",NULL,"3",NULL,{"5","6","squ,awk"}}');
});

test('prepareValue: complex array prepared properly', function() {
  var out = utils.prepareValue([{ x: 42 }, { y: 84 }]);
  assert.strictEqual(out, '{"{\\"x\\":42}","{\\"y\\":84}"}');
});

test('prepareValue: date array prepared properly', function() {
  helper.setTimezoneOffset(-330);

  var date = new Date(2014, 1, 1, 11, 11, 1, 7);
  var out = utils.prepareValue([date]);
  assert.strictEqual(out, '{"2014-02-01T11:11:01.007+05:30"}');

  helper.resetTimezoneOffset();
});

test('prepareValue: arbitrary objects prepared properly', function() {
  var out = utils.prepareValue({ x: 42 });
  assert.strictEqual(out, '{"x":42}');
});

test('prepareValue: objects with simple toPostgres prepared properly', function() {
  var customType = {
    toPostgres: function() {
      return "zomgcustom!";
    }
  };
  var out = utils.prepareValue(customType);
  assert.strictEqual(out, "zomgcustom!");
});

test('prepareValue: objects with complex toPostgres prepared properly', function() {
  var buf = new Buffer("zomgcustom!");
  var customType = {
    toPostgres: function() {
      return [1, 2];
    }
  };
  var out = utils.prepareValue(customType);
  assert.strictEqual(out, '{"1","2"}');
});

test('prepareValue: objects with toPostgres receive prepareValue', function() {
  var customRange = {
    lower: { toPostgres: function() { return 5; } },
    upper: { toPostgres: function() { return 10; } },
    toPostgres: function(prepare) {
      return "[" + prepare(this.lower) + "," + prepare(this.upper) + "]";
    }
  };
  var out = utils.prepareValue(customRange);
  assert.strictEqual(out, "[5,10]");
});

test('prepareValue: objects with circular toPostgres rejected', function() {
  var buf = new Buffer("zomgcustom!");
  var customType = {
    toPostgres: function() {
      return { toPostgres: function () { return customType; } };
    }
  };

  //can't use `assert.throws` since we need to distinguish circular reference
  //errors from call stack exceeded errors
  try {
    utils.prepareValue(customType);
  } catch (e) {
    assert.ok(e.message.match(/circular/), "Expected circular reference error but got " + e);
    return;
  }
  throw new Error("Expected prepareValue to throw exception");
});

test('prepareValue: can safely be used to map an array of values including those with toPostgres functions', function() {
  var customType = {
    toPostgres: function() {
      return "zomgcustom!";
    }
  };
  var values = [1, "test", customType]
  var out = values.map(utils.prepareValue)
  assert.deepEqual(out, [1, "test", "zomgcustom!"])
})