d8d1d4cc64
Asserts on hash.keys or hash.values can not be relied on as the order is random (I had an expected values of [:two, :one] when I got to that test).
64 lines
1.5 KiB
Ruby
64 lines
1.5 KiB
Ruby
require 'edgecase'
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class AboutHashes < EdgeCase::Koan
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def test_creating_hashes
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empty_hash = Hash.new
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assert_equal Hash, empty_hash.class
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assert_equal({}, empty_hash)
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assert_equal __, empty_hash.size
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end
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def test_hash_literals
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hash = { :one => "uno", :two => "dos" }
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assert_equal __, hash.size
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end
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def test_accessing_hashes
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hash = { :one => "uno", :two => "dos" }
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assert_equal __, hash[:one]
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assert_equal __, hash[:two]
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assert_equal __, hash[:doesnt_exist]
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end
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def test_changing_hashes
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hash = { :one => "uno", :two => "dos" }
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hash[:one] = "eins"
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expected = { :one => __, :two => "dos" }
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assert_equal expected, hash
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# Bonus Question: Why was "expected" broken out into a variable
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# rather than used as a literal?
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end
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def test_hash_is_unordered
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hash1 = { :one => "uno", :two => "dos" }
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hash2 = { :two => "dos", :one => "uno" }
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assert_equal hash1, hash2
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end
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def test_hash_keys_and_values
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hash = { :one => "uno", :two => "dos" }
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assert_equal __, hash.keys.size
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assert_equal __, hash.has_key?(:one)
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# Why not just compare hash.keys to [:one, :two]?
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#
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# Clue: What was the name of the previous test again?
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assert_equal __, hash.values.sort
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end
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def test_combining_hashes
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hash = { "jim" => 53, "amy" => 20, "dan" => 23 }
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new_hash = hash.merge({ "jim" => 54, "jenny" => 26 })
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assert_not_equal hash, new_hash
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expected = { "jim" => __, "amy" => 20, "dan" => 23, "jenny" => __ }
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assert_equal expected, new_hash
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end
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end
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