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describe("groupBy", function() {
  ensureLaziness(function() { Lazy(people).groupBy(Person.getGender); });

  it("groups the collection by a specified selector function", function() {
    var byGender = Lazy(people).groupBy(Person.getGender).toArray();
    expect(byGender).toEqual([
      ["M", [david, adam, daniel]],
      ["F", [mary, lauren, happy]]
    ]);
  });

  it("groups the collection by a specified selector function for async sequences", function() {
    var byGender = {};

    Lazy(people)
      .async()
      .groupBy(Person.getGender)
      .toObject()
      .onComplete(function(result) {
        populate(byGender, result);
      });

    waitsFor(toBePopulated(byGender));

    runs(function() {
      expect(byGender).toEqual({
        M: [david, adam, daniel],
        F: [mary, lauren, happy]
      });
    });
  });

  testAllSequenceTypes(
    "uses a 'pluck'-style callback when a string is passed instead of a function",

    [
      { foo: 1, bar: 1 },
      { foo: 2, bar: 2 },
      { foo: 1, bar: 3 }
    ],

    function(sequence) {
      expect(sequence.groupBy('foo').toObject()).toEqual({
        '1': [
          { foo: 1, bar: 1 },
          { foo: 1, bar: 3 }
        ],
        '2': [
          { foo: 2, bar: 2 }
        ]
      });
    }
  );
});

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