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test_numeric.rb
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test_numeric.rb
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require 'test/unit'
class TestNumeric < Test::Unit::TestCase
class NumericWithSomeMethods < Numeric
def initialize(value = 0)
@value = value
end
def expect(arg)
@expected_arg = arg
end
def check(arg)
raise "Expected #{@expected_arg.inspect}, but received #{arg.inspect}" unless @expected_arg == arg
end
def /(arg) check(arg); 543.21 end
def %(arg) check(arg); 89 end
def to_f() @value.to_f end
def <=>(other) @value <=> other end
def <(other) @value < other end
def >(other) @value > other end
def eql?(other) @value.eql?(other) end
def to_i() @value.to_i end
end
def setup
@a = Numeric.new
@b = Numeric.new
end
def test_unary_plus
assert_same @a, +@a
end
def test_unary_minus_should_raise_if_self_cannot_be_coerced_to_float
assert_raises(TypeError) { -@a }
end
def test_unary_minus_should_coerce_to_float_and_negate_result
assert_equal 123.45, NumericWithSomeMethods.new(123.45).to_f
assert_equal -123.45, -NumericWithSomeMethods.new(123.45)
end
def test_spaceship_should_return_zero_when_comparting_with_self_and_nil_otherwise
assert_equal 0, @a <=> @a
assert_nil @a <=> @b
assert_nil @a <=> 1
assert_nil @a <=> ""
assert_nil @a <=> nil
end
def test_abs_should_return_self_if_bigger_than_zero_and_result_of_unitary_minus_on_self_otherwise
assert_raises(ArgumentError) { @a.abs }
positive = NumericWithSomeMethods.new(1).abs
assert positive > 0
assert_same positive, positive.abs
negative = NumericWithSomeMethods.new(-2)
assert negative < 0
# unitary minus operator effectively returns -(self.to_f)
assert_equal 2.0, negative.abs
assert_equal Float, negative.abs.class
end
# ceil
def test_ceil_should_delegate_to_self_to_f
assert_equal 124, NumericWithSomeMethods.new(123.49).ceil
assert_equal -123, NumericWithSomeMethods.new(-123.51).ceil
end
def test_ceil_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.ceil }
end
def test_coerce_should_copy_argument_and_self_if_both_have_the_same_type
assert_equal [@b, @a], @a.coerce(@b)
assert_equal [0.9, 0.1], 0.1.coerce(0.9)
assert_equal [0, 1], 1.coerce(0)
end
def test_coerce_should_call_float_on_self_and_arg_if_they_are_of_different_type
bignum = 100000000000000000000000
assert bignum.is_a?(Bignum)
assert_equal [Float(bignum), 0.0], 0.0.coerce(bignum)
assert 0.0.coerce(bignum).first.is_a?(Float)
assert 0.0.coerce(bignum).last.is_a?(Float)
n = NumericWithSomeMethods.new(123.45)
assert_equal [1.0, 123.45], n.coerce(1.0)
end
def test_coerce_should_blow_up_if_self_or_arg_cannot_be_converted_to_float_by_kernel_Float
assert_raises(TypeError) { @a.coerce(1.0) }
assert_raises(ArgumentError) { 1.coerce("test") }
assert_raises(TypeError) { 1.coerce(nil) }
assert_raises(TypeError) { 1.coerce(false) }
end
def test_div_should_raise_if_self_doesnt_implement_divison_operator
assert_raises(NoMethodError) { @a.div(@b) }
end
def test_div_should_call_division_method_and_floor_it
n = NumericWithSomeMethods.new
# n / anything returns 543.21
n.expect(:foo)
assert_equal 543.21, n / :foo
n.expect(@a)
assert_equal 543, n.div(@a)
end
def test_divmod_should_return_result_of_div_and_mod_as_array
n = NumericWithSomeMethods.new
n.expect(:foo)
# n.div(anything) returns 543, n % anything returns 89
assert_equal [543, 89], n.divmod(:foo)
end
def test_divmod_should_calculate_div_correctly
dividends = [-0.58, 0.58, -0.59, 0.59, -0.63, 0.63, -0.66, 0.66, -0.67, 0.67]
divisor = 1 / 12.0
expected_divs = [-7, 6, -8, 7, -8, 7, -8, 7, -9, 8]
dividends.each_with_index { |dividend, idx|
assert_equal(expected_divs[idx], dividend.divmod(divisor)[0])
}
end
def test_divmod_should_raise_when_self_doesnt_implement_div_or_mod
assert_raises(NoMethodError) { @a.divmod(@b) }
end
def test_eql
assert_equal true, @a.eql?(@a)
assert_equal false, @a.eql?(@b)
end
def test_floor_should_delegate_to_self_to_f
assert_equal 123, NumericWithSomeMethods.new(123.51).floor
assert_equal -124, NumericWithSomeMethods.new(-123.49).floor
end
def test_floor_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.floor }
end
def test_initialize_copy_should_raise
assert_raises(TypeError) { @a.instance_eval("initialize_copy(:foo)") }
end
def test_initialize_copy_should_be_private
assert @a.private_methods.include?("initialize_copy")
assert_equal false, @a.methods.include?("initialize_copy")
end
def test_integer
assert_equal false, @a.integer?
end
def test_modulo_should_raise_if_self_doesnt_have_percent_operator
assert_raises(NoMethodError) { @a.modulo(@b) }
end
def test_modulo_should_call_percent_operator
n = NumericWithSomeMethods.new
n.expect(:foo)
# n % anything returns 89
assert_equal 89, n.modulo(:foo)
end
def test_nonzero_should_check_equality_and_returns_self_or_nil
assert_same @a, @a.nonzero?
assert_nil NumericWithSomeMethods.new(0).nonzero?
one = NumericWithSomeMethods.new(1)
minus_one = NumericWithSomeMethods.new(1)
assert_same one, one.nonzero?
assert_same minus_one, minus_one.nonzero?
end
def test_quo
assert_raises(NoMethodError) { @a.quo @b }
end
def test_remainder_should_raise_if_self_doesnt_implement_modulo
assert_raises(NoMethodError) { @a.remainder(@b) }
end
def test_remainder_should_return_modulo_if_self_and_arg_have_the_same_sign_and_modulo_minus_arg_otherwise_except_when_modulo_is_zero
# Float doesn't override Numeric#remainder, so that's what we are testng here
assert_equal 2.0, 5.0.remainder(3)
assert_equal 2.0, 5.0.remainder(-3)
assert_equal -2.0, -5.0.remainder(-3)
assert_equal -2.0, -5.0.remainder(3)
# special case, was a bug
assert_equal 0.0, 4.0.remainder(2)
assert_equal 0.0, 4.0.remainder(-2)
assert_equal 0.0, -4.0.remainder(2)
assert_equal 0.0, -4.0.remainder(-2)
end
def test_round_should_delegate_to_self_to_f
assert_equal 123, NumericWithSomeMethods.new(123.49).round
assert_equal 124, NumericWithSomeMethods.new(123.51).round
assert_equal -123, NumericWithSomeMethods.new(-123.49).round
assert_equal -124, NumericWithSomeMethods.new(-123.51).round
end
def test_round_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.round }
end
def test_step
# Fixnum doesn't override Numeric#step()
# ends exactly at :to
a = []
1.step(5, 2) { |x| a << x }
assert_equal [1, 3, 5], a
# ends before :to
a = []
1.step(4, 2) { |x| a << x }
assert_equal [1, 3], a
# step is too big
a = []
1.step(4, 10) { |x| a << x }
assert_equal [1], a
# step is zero
assert_raises(ArgumentError) { 1.step(1, 0) }
# same to and from
a = []
1.step(1, 1) { |x| a << x }
assert_equal [1], a
# from less than to, positive step value
a = []
1.step(0, 1) { |x| a << x }
assert_equal [], a
# from less than to, negative step value
a = []
1.step(0, 1) { |x| a << x }
assert_equal [], a
# default step value of 1
a = []
1.step(3) { |x| a << x }
assert_equal [1, 2, 3], a
end
def test_step_should_raise_if_step_is_zero
end
def test_to_int_should_call_to_i_or_raise_if_to_i_is_not_implemented
assert_equal 123, NumericWithSomeMethods.new(123).to_int
assert_raises(NoMethodError) { @a.to_int }
end
def test_truncate_should_delegate_to_self_to_f
assert_equal 123, NumericWithSomeMethods.new(123.49).truncate
assert_equal 123, NumericWithSomeMethods.new(123.51).truncate
assert_equal -123, NumericWithSomeMethods.new(-123.49).truncate
assert_equal -123, NumericWithSomeMethods.new(-123.51).truncate
end
def test_truncate_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.truncate }
end
def test_zero_should_check_equality
assert_equal false, @a.zero?
assert_equal true, NumericWithSomeMethods.new(0).zero?
assert_equal false, NumericWithSomeMethods.new(1).zero?
assert_equal false, NumericWithSomeMethods.new(-1).zero?
end
end
require 'test/unit'
class TestNumeric < Test::Unit::TestCase
class NumericWithSomeMethods < Numeric
def initialize(value = 0)
@value = value
end
def expect(arg)
@expected_arg = arg
end
def check(arg)
raise "Expected #{@expected_arg.inspect}, but received #{arg.inspect}" unless @expected_arg == arg
end
def /(arg) check(arg); 543.21 end
def %(arg) check(arg); 89 end
def to_f() @value.to_f end
def <=>(other) @value <=> other end
def <(other) @value < other end
def >(other) @value > other end
def eql?(other) @value.eql?(other) end
def to_i() @value.to_i end
end
def setup
@a = Numeric.new
@b = Numeric.new
end
def test_unary_plus
assert_same @a, +@a
end
def test_unary_minus_should_raise_if_self_cannot_be_coerced_to_float
assert_raises(TypeError) { -@a }
end
def test_unary_minus_should_coerce_to_float_and_negate_result
assert_equal 123.45, NumericWithSomeMethods.new(123.45).to_f
assert_equal -123.45, -NumericWithSomeMethods.new(123.45)
end
def test_spaceship_should_return_zero_when_comparting_with_self_and_nil_otherwise
assert_equal 0, @a <=> @a
assert_nil @a <=> @b
assert_nil @a <=> 1
assert_nil @a <=> ""
assert_nil @a <=> nil
end
def test_abs_should_return_self_if_bigger_than_zero_and_result_of_unitary_minus_on_self_otherwise
assert_raises(ArgumentError) { @a.abs }
positive = NumericWithSomeMethods.new(1).abs
assert positive > 0
assert_same positive, positive.abs
negative = NumericWithSomeMethods.new(-2)
assert negative < 0
# unitary minus operator effectively returns -(self.to_f)
assert_equal 2.0, negative.abs
assert_equal Float, negative.abs.class
end
# ceil
def test_ceil_should_delegate_to_self_to_f
assert_equal 124, NumericWithSomeMethods.new(123.49).ceil
assert_equal -123, NumericWithSomeMethods.new(-123.51).ceil
end
def test_ceil_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.ceil }
end
def test_coerce_should_copy_argument_and_self_if_both_have_the_same_type
assert_equal [@b, @a], @a.coerce(@b)
assert_equal [0.9, 0.1], 0.1.coerce(0.9)
assert_equal [0, 1], 1.coerce(0)
end
def test_coerce_should_call_float_on_self_and_arg_if_they_are_of_different_type
bignum = 100000000000000000000000
assert bignum.is_a?(Bignum)
assert_equal [Float(bignum), 0.0], 0.0.coerce(bignum)
assert 0.0.coerce(bignum).first.is_a?(Float)
assert 0.0.coerce(bignum).last.is_a?(Float)
n = NumericWithSomeMethods.new(123.45)
assert_equal [1.0, 123.45], n.coerce(1.0)
end
def test_coerce_should_blow_up_if_self_or_arg_cannot_be_converted_to_float_by_kernel_Float
assert_raises(TypeError) { @a.coerce(1.0) }
assert_raises(ArgumentError) { 1.coerce("test") }
assert_raises(TypeError) { 1.coerce(nil) }
assert_raises(TypeError) { 1.coerce(false) }
end
def test_div_should_raise_if_self_doesnt_implement_divison_operator
assert_raises(NoMethodError) { @a.div(@b) }
end
def test_div_should_call_division_method_and_floor_it
n = NumericWithSomeMethods.new
# n / anything returns 543.21
n.expect(:foo)
assert_equal 543.21, n / :foo
n.expect(@a)
assert_equal 543, n.div(@a)
end
def test_divmod_should_return_result_of_div_and_mod_as_array
n = NumericWithSomeMethods.new
n.expect(:foo)
# n.div(anything) returns 543, n % anything returns 89
assert_equal [543, 89], n.divmod(:foo)
end
def test_divmod_should_raise_when_self_doesnt_implement_div_or_mod
assert_raises(NoMethodError) { @a.divmod(@b) }
end
def test_eql
assert_equal true, @a.eql?(@a)
assert_equal false, @a.eql?(@b)
end
def test_floor_should_delegate_to_self_to_f
assert_equal 123, NumericWithSomeMethods.new(123.51).floor
assert_equal -124, NumericWithSomeMethods.new(-123.49).floor
end
def test_floor_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.floor }
end
def test_initialize_copy_should_raise
assert_raises(TypeError) { @a.instance_eval("initialize_copy(:foo)") }
end
def test_initialize_copy_should_be_private
assert @a.private_methods.include?("initialize_copy")
assert_equal false, @a.methods.include?("initialize_copy")
end
def test_integer
assert_equal false, @a.integer?
end
def test_modulo_should_raise_if_self_doesnt_have_percent_operator
assert_raises(NoMethodError) { @a.modulo(@b) }
end
def test_modulo_should_call_percent_operator
n = NumericWithSomeMethods.new
n.expect(:foo)
# n % anything returns 89
assert_equal 89, n.modulo(:foo)
end
def test_nonzero_should_check_equality_and_returns_self_or_nil
assert_same @a, @a.nonzero?
assert_nil NumericWithSomeMethods.new(0).nonzero?
one = NumericWithSomeMethods.new(1)
minus_one = NumericWithSomeMethods.new(1)
assert_same one, one.nonzero?
assert_same minus_one, minus_one.nonzero?
end
def test_quo
assert_raises(NoMethodError) { @a.quo @b }
end
def test_remainder_should_raise_if_self_doesnt_implement_modulo
assert_raises(NoMethodError) { @a.remainder(@b) }
end
def test_remainder_should_return_modulo_if_self_and_arg_have_the_same_sign_and_modulo_minus_arg_otherwise_except_when_modulo_is_zero
# Float doesn't override Numeric#remainder, so that's what we are testng here
assert_equal 2.0, 5.0.remainder(3)
assert_equal 2.0, 5.0.remainder(-3)
assert_equal -2.0, -5.0.remainder(-3)
assert_equal -2.0, -5.0.remainder(3)
# special case, was a bug
assert_equal 0.0, 4.0.remainder(2)
assert_equal 0.0, 4.0.remainder(-2)
assert_equal 0.0, -4.0.remainder(2)
assert_equal 0.0, -4.0.remainder(-2)
end
def test_round_should_delegate_to_self_to_f
assert_equal 123, NumericWithSomeMethods.new(123.49).round
assert_equal 124, NumericWithSomeMethods.new(123.51).round
assert_equal -123, NumericWithSomeMethods.new(-123.49).round
assert_equal -124, NumericWithSomeMethods.new(-123.51).round
end
def test_round_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.round }
end
def test_step
# Fixnum doesn't override Numeric#step()
# ends exactly at :to
a = []
1.step(5, 2) { |x| a << x }
assert_equal [1, 3, 5], a
# ends before :to
a = []
1.step(4, 2) { |x| a << x }
assert_equal [1, 3], a
# step is too big
a = []
1.step(4, 10) { |x| a << x }
assert_equal [1], a
# step is zero
assert_raises(ArgumentError) { 1.step(1, 0) }
# same to and from
a = []
1.step(1, 1) { |x| a << x }
assert_equal [1], a
# from less than to, positive step value
a = []
1.step(0, 1) { |x| a << x }
assert_equal [], a
# from less than to, negative step value
a = []
1.step(0, 1) { |x| a << x }
assert_equal [], a
# default step value of 1
a = []
1.step(3) { |x| a << x }
assert_equal [1, 2, 3], a
end
def test_step_should_raise_if_step_is_zero
end
def test_to_int_should_call_to_i_or_raise_if_to_i_is_not_implemented
assert_equal 123, NumericWithSomeMethods.new(123).to_int
assert_raises(NoMethodError) { @a.to_int }
end
def test_truncate_should_delegate_to_self_to_f
assert_equal 123, NumericWithSomeMethods.new(123.49).truncate
assert_equal 123, NumericWithSomeMethods.new(123.51).truncate
assert_equal -123, NumericWithSomeMethods.new(-123.49).truncate
assert_equal -123, NumericWithSomeMethods.new(-123.51).truncate
end
def test_truncate_should_raise_if_self_doesnt_implement_to_f
assert_raises(TypeError) { @a.truncate }
end
def test_zero_should_check_equality
assert_equal false, @a.zero?
assert_equal true, NumericWithSomeMethods.new(0).zero?
assert_equal false, NumericWithSomeMethods.new(1).zero?
assert_equal false, NumericWithSomeMethods.new(-1).zero?
end
end