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Add method for ensuring unique values
Add a method to Faker::Base that wraps the existing class and ensures that the responses are unique.
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Original file line number | Diff line number | Diff line change |
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module Faker | ||
class UniqueGenerator | ||
def initialize(generator, max_retries) | ||
@generator = generator | ||
@max_retries = max_retries | ||
@previous_results = Hash.new { |hash, key| hash[key] = Set.new } | ||
end | ||
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def method_missing(name, *arguments) | ||
@max_retries.times do | ||
result = @generator.public_send(name, *arguments) | ||
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next if @previous_results[[name, arguments]].include?(result) | ||
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@previous_results[[name, arguments]] << result | ||
return result | ||
end | ||
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raise RetryLimitExceeded | ||
end | ||
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RetryLimitExceeded = Class.new(StandardError) | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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require File.expand_path(File.dirname(__FILE__) + '/test_helper.rb') | ||
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class TestFakerUniqueGenerator < Test::Unit::TestCase | ||
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def test_generates_unique_values | ||
generator = Faker::UniqueGenerator.new(Faker::Base, 10_000) | ||
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result = [generator.rand_in_range(1, 2), generator.rand_in_range(1, 2)] | ||
assert_equal([1, 2], result.sort) | ||
end | ||
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def test_returns_error_when_retries_exceeded | ||
stubbed_generator = Object.new | ||
def stubbed_generator.test | ||
1 | ||
end | ||
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generator = Faker::UniqueGenerator.new(stubbed_generator, 3) | ||
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generator.test | ||
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assert_raises Faker::UniqueGenerator::RetryLimitExceeded do | ||
generator.test | ||
end | ||
end | ||
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end |