Sapphire

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# test_aref.rb

#

# Tests for the Hash#[] instance method.

#######################################################################

require 'test/unit'

class Test_Hash_Aref_InstanceMethod < Test::Unit::TestCase

  def setup

    @hash = {:foo, 1, 'bar', 2, nil, 3, false, 4, 'foo', 5, 3.7, 6.0}

  end

  test "aref basic functionality" do

    assert_respond_to(@hash, :[])

    assert_nothing_raised{ @hash['bar'] }

  end

  test "aref expected results" do

    assert_equal(1, @hash[:foo])

    assert_equal(2, @hash['bar'])

    assert_equal(5, @hash['foo'])

    assert_equal(nil, @hash['bogus'])

  end

  test "aref with explicit nil key works as expected" do

    assert_equal(3, @hash[nil])

  end

  test "aref with explicit false key works as expected" do

    assert_equal(4, @hash[false])

  end

  test "aref with float works as expected" do

    assert_equal(6.0, @hash[3.7])

  end

  test "aref slice returns expected array" do

    assert_equal([1, 2], @hash[:foo, 'bar'])

    assert_equal([1, nil], @hash[:foo, 'bogus'])

  end

  test "aref with nested hash returns expected result" do

    hash = {{:a, 1}, {:b, 2}}

    assert_equal({:b, 2}, hash[{:a, 1}])

  end

  test "aref requires at least on argument" do

    assert_raise(ArgumentError){ @hash[] }

  end

  def teardown

    @hash = nil

  end

end