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#!/usr/bin/env ruby
# encoding: UTF-8
require "test/unit"
require "levenshtein"
module Levenshtein
class TestSequence
def initialize(o)
@sequence = o
end
def each
@sequence.length.times do |pos|
yield(@sequence[pos])
end
end
end
class TestElement
attr_reader :object
def initialize(o)
@object = o
end
def hash
@object.hash
end
def eql?(other)
@object.eql?(other.object)
end
end
end
class TestLevenshtein < Test::Unit::TestCase
def test_erik_veenstra
assert_equal(7, Levenshtein.distance("erik", "veenstra"))
assert_equal(7, Levenshtein.distance("veenstra", "erik"))
assert_in_delta(0.875, Levenshtein.normalized_distance("erik", "veenstra"), 0.01)
assert_in_delta(0.875, Levenshtein.normalized_distance("veenstra", "erik"), 0.01)
end
def test_empty_string
assert_equal(0, Levenshtein.distance("", ""))
assert_equal(3, Levenshtein.distance("", "foo"))
assert_equal(3, Levenshtein.distance("foo", ""))
assert_in_delta(0.0, Levenshtein.normalized_distance("", ""), 0.01)
assert_in_delta(1.0, Levenshtein.normalized_distance("", "foo"), 0.01)
assert_in_delta(1.0, Levenshtein.normalized_distance("foo", ""), 0.01)
end
def test_same_string
assert_equal(0, Levenshtein.distance("", ""))
assert_equal(0, Levenshtein.distance("foo", "foo"))
assert_in_delta(0.0, Levenshtein.normalized_distance("", ""), 0.01)
assert_in_delta(0.0, Levenshtein.normalized_distance("foo", "foo"), 0.01)
end
def test_threshold
assert_equal(3, Levenshtein.distance("foo", "foobar"))
assert_equal(3, Levenshtein.distance("foo", "foobar", 4))
assert_equal(nil, Levenshtein.distance("foo", "foobar", 2))
assert_in_delta(0.5, Levenshtein.normalized_distance("foo", "foobar"), 0.01)
assert_in_delta(0.5, Levenshtein.normalized_distance("foo", "foobar", 0.66), 0.01)
assert_equal(nil, Levenshtein.normalized_distance("foo", "foobar", 0.30))
end
def test_same_head_and_or_tail
assert_equal(3, Levenshtein.distance("ab123cd", "abxyzcd"))
assert_equal(3, Levenshtein.distance("ab123", "abxyz"))
assert_equal(3, Levenshtein.distance("123cd", "xyzcd"))
assert_equal(5, Levenshtein.distance("123cd123", "123"))
assert_in_delta(0.42, Levenshtein.normalized_distance("ab123cd", "abxyzcd"), 0.01)
assert_in_delta(0.6, Levenshtein.normalized_distance("ab123", "abxyz"), 0.01)
assert_in_delta(0.6, Levenshtein.normalized_distance("123cd", "xyzcd"), 0.01)
assert_in_delta(0.625, Levenshtein.normalized_distance("123cd123", "123"), 0.01)
end
def test_interface
seq1 = Levenshtein::TestSequence.new("erik".scan(/./).collect{|e| Levenshtein::TestElement.new(e)})
seq2 = Levenshtein::TestSequence.new("veenstra".scan(/./).collect{|e| Levenshtein::TestElement.new(e)})
assert_equal(7, Levenshtein.distance(seq1, seq2))
end
end
class TestLevenshteinFast < Test::Unit::TestCase
def test_erik_veenstra
assert_equal(7, Levenshtein.distance("erik", "veenstra", nil, :force_slow=>false))
assert_equal(7, Levenshtein.distance("veenstra", "erik", nil, :force_slow=>false))
end
def test_empty_string
assert_equal(0, Levenshtein.distance("", "", nil, :force_slow=>false))
assert_equal(3, Levenshtein.distance("", "foo", nil, :force_slow=>false))
assert_equal(3, Levenshtein.distance("foo", "", nil, :force_slow=>false))
end
def test_same_string
assert_equal(0, Levenshtein.distance("", "", nil, :force_slow=>false))
assert_equal(0, Levenshtein.distance("foo", "foo", nil, :force_slow=>false))
end
def test_threshold
assert_equal(3, Levenshtein.distance("foo", "foobar", nil, :force_slow=>false))
assert_equal(3, Levenshtein.distance("foo", "foobar", 4, :force_slow=>false))
assert_equal(nil, Levenshtein.distance("foo", "foobar", 2, :force_slow=>false))
end
def test_same_head_and_or_tail
assert_equal(3, Levenshtein.distance("ab123cd", "abxyzcd", nil, :force_slow=>false))
assert_equal(3, Levenshtein.distance("ab123", "abxyz", nil, :force_slow=>false))
assert_equal(3, Levenshtein.distance("123cd", "xyzcd", nil, :force_slow=>false))
assert_equal(5, Levenshtein.distance("123cd123", "123", nil, :force_slow=>false))
end
end
class TestLevenshteinSlow < Test::Unit::TestCase
def test_erik_veenstra
assert_equal(7, Levenshtein.distance("erik", "veenstra", nil, :force_slow=>true))
assert_equal(7, Levenshtein.distance("veenstra", "erik", nil, :force_slow=>true))
end
def test_empty_string
assert_equal(0, Levenshtein.distance("", "", nil, :force_slow=>true))
assert_equal(3, Levenshtein.distance("", "foo", nil, :force_slow=>true))
assert_equal(3, Levenshtein.distance("foo", "", nil, :force_slow=>true))
end
def test_same_string
assert_equal(0, Levenshtein.distance("", "", nil, :force_slow=>true))
assert_equal(0, Levenshtein.distance("foo", "foo", nil, :force_slow=>true))
end
def test_threshold
assert_equal(3, Levenshtein.distance("foo", "foobar", nil, :force_slow=>true))
assert_equal(3, Levenshtein.distance("foo", "foobar", 4, :force_slow=>true))
assert_equal(nil, Levenshtein.distance("foo", "foobar", 2, :force_slow=>true))
end
def test_same_head_and_or_tail
assert_equal(3, Levenshtein.distance("ab123cd", "abxyzcd", nil, :force_slow=>true))
assert_equal(3, Levenshtein.distance("ab123", "abxyz", nil, :force_slow=>true))
assert_equal(3, Levenshtein.distance("123cd", "xyzcd", nil, :force_slow=>true))
assert_equal(5, Levenshtein.distance("123cd123", "123", nil, :force_slow=>true))
end
end
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