##
# Integer ISO Test

assert('Integer', '15.2.8') do
  assert_equal Integer.class, Class
end

assert('Integer superclass', '15.2.8.2') do
  assert_equal Integer.superclass, Numeric
end

assert('Integer#+', '15.2.8.3.1') do
  a = 1+1
  b = 1+1.0

  assert_equal a, 2
  assert_equal b, 2.0
end

assert('Integer#-', '15.2.8.3.2') do
  a = 2-1
  b = 2-1.0

  assert_equal a, 1
  assert_equal b, 1.0
end

assert('Integer#*', '15.2.8.3.3') do
  a = 1*1
  b = 1*1.0

  assert_equal a, 1
  assert_equal b, 1.0
end

assert('Integer#/', '15.2.8.3.4') do
  a = 2/1
  b = 2/1.0

  assert_equal a, 2
  assert_equal b, 2.0
end

assert('Integer#%', '15.2.8.3.5') do
  a = 1%1
  b = 1%1.0
  c = 2%4

  assert_equal a, 0
  assert_equal b, 0.0
  assert_equal c, 2
end

assert('Integer#<=>', '15.2.8.3.6') do
  a = 1<=>0
  b = 1<=>1
  c = 1<=>2

  assert_equal a, 1
  assert_equal b, 0
  assert_equal c, -1
end

assert('Integer#==', '15.2.8.3.7') do
  a = 1==0
  b = 1==1

  assert_false a
  assert_true b
end

assert('Integer#~', '15.2.8.3.8') do
  # Complement
  assert_equal ~0, -1
  assert_equal ~2, -3
end

assert('Integer#&', '15.2.8.3.9') do
  # Bitwise AND
  #   0101 (5)
  # & 0011 (3)
  # = 0001 (1)
  assert_equal 5 & 3, 1
end

assert('Integer#|', '15.2.8.3.10') do
  # Bitwise OR
  #   0101 (5)
  # | 0011 (3)
  # = 0111 (7)
  assert_equal 5 | 3, 7
end

assert('Integer#^', '15.2.8.3.11') do
  # Bitwise XOR
  #   0101 (5)
  # ^ 0011 (3)
  # = 0110 (6)
  assert_equal 5 ^ 3, 6
end

assert('Integer#<<', '15.2.8.3.12') do
  # Left Shift by one
  #   00010111 (23)
  # = 00101110 (46)
  assert_equal 23 << 1, 46

  # Left Shift by a negative is Right Shift
  assert_equal 46 << -1, 23

  # Raise when shift is too large
  assert_raise(RangeError) do
    2 << 128
  end
end

assert('Integer#>>', '15.2.8.3.13') do
  # Right Shift by one
  #   00101110 (46)
  # = 00010111 (23)
  assert_equal 46 >> 1, 23

  # Right Shift by a negative is Left Shift
  assert_equal 23 >> -1, 46

  # Don't raise on large Right Shift
  assert_equal 23 >> 128, 0

  # Raise when shift is too large
  assert_raise(RangeError) do
    2 >> -128
  end
end

assert('Integer#ceil', '15.2.8.3.14') do
  assert_equal 10.ceil, 10
end

assert('Integer#downto', '15.2.8.3.15') do
  a = 0
  3.downto(1) do |i|
    a += i
  end
  assert_equal a, 6
end

assert('Integer#eql?', '15.2.8.3.16') do
  a = 1.eql?(1)
  b = 1.eql?(2)
  c = 1.eql?(nil)

  assert_true a
  assert_false b
  assert_false c
end

assert('Integer#floor', '15.2.8.3.17') do
  a = 1.floor

  assert_equal a, 1
end

assert('Integer#next', '15.2.8.3.19') do
  assert_equal 1.next, 2
end

assert('Integer#round', '15.2.8.3.20') do
  assert_equal 1.round, 1
end

assert('Integer#succ', '15.2.8.3.21') do
  assert_equal 1.succ, 2
end

assert('Integer#times', '15.2.8.3.22') do
  a = 0
  3.times do
    a += 1
  end
  assert_equal a, 3
end

assert('Integer#to_f', '15.2.8.3.23') do
  assert_equal 1.to_f, 1.0
end

assert('Integer#to_i', '15.2.8.3.24') do
  assert_equal 1.to_i, 1
end

assert('Integer#to_s', '15.2.8.3.25') do
  assert_equal 1.to_s, '1'
  assert_equal(-1.to_s, "-1")
end

assert('Integer#truncate', '15.2.8.3.26') do
  assert_equal 1.truncate, 1
end

assert('Integer#upto', '15.2.8.3.27') do
  a = 0
  1.upto(3) do |i|
    a += i
  end
  assert_equal a, 6
end

# Not ISO specified

assert('Integer#step') do
  a = []
  b = []
  1.step(3) do |i|
    a << i
  end
  1.step(6, 2) do |i|
    b << i
  end

  assert_equal a, [1, 2, 3]
  assert_equal b, [1, 3, 5]
end