Complete ISO test cases for Hash, Range, String and Symbol

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diff --git a/test/t/hash.rb b/test/t/hash.rb
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+##
+# Hash ISO Test
+
+assert('Hash', '15.2.13') do
+  Hash.class == Class
+end
+
+assert('Hash#==', '15.2.13.4.1') do
+  ({ 'abc' => 'abc' } ==  { 'abc' => 'abc' }) and
+    not ({ 'abc' => 'abc' } ==  { 'cba' => 'cba' })
+end
+
+assert('Hash#[]', '15.2.13.4.2') do
+  a = { 'abc' => 'abc' }
+
+  a['abc'] == 'abc'
+end
+
+assert('Hash#[]=', '15.2.13.4.3') do
+  a = Hash.new
+  a['abc'] = 'abc'
+
+  a['abc'] == 'abc'
+end
+
+assert('Hash#clear', '15.2.13.4.4') do
+  a = { 'abc' => 'abc' }
+  a.clear
+
+  a == { }
+end
+
+assert('Hash#default', '15.2.13.4.5') do
+  a = Hash.new
+  b = Hash.new('abc')
+  c = Hash.new {|s,k| s[k] = k}
+
+  a.default == nil and b.default == 'abc' and
+    c.default == nil and c.default('abc') == 'abc'
+end
+
+assert('Hash#default=', '15.2.13.4.6') do
+  a = { 'abc' => 'abc' }
+  a.default = 'cba'
+
+  a['abc'] == 'abc' and a['notexist'] == 'cba'
+end
+
+assert('Hash#default_proc', '15.2.13.4.7') do
+  a = Hash.new
+  b = Hash.new {|s,k| s[k] = k}
+
+  a.default_proc == nil and b.default_proc.class == Proc
+end
+
+assert('Hash#delete', '15.2.13.4.8') do
+  a = { 'abc' => 'abc' }
+  b = { 'abc' => 'abc' }
+  b_tmp_1 = false
+  b_tmp_2 = false
+
+  a.delete('abc')
+  b.delete('abc') do |k|
+    b_tmp_1 = true
+  end
+  b.delete('abc') do |k|
+    b_tmp_2 = true
+  end
+
+  a.delete('cba') == nil and not a.has_key?('abc') and
+    not b_tmp_1 and b_tmp_2
+end
+
+assert('Hash#each', '15.2.13.4.9') do
+  a = { 'abc_key' => 'abc_value' }
+  key = nil
+  value = nil
+
+  a.each  do |k,v|
+    key = k
+    value = v
+  end
+
+  key == 'abc_key' and value == 'abc_value'
+end
+
+assert('Hash#each_key', '15.2.13.4.10') do
+  a = { 'abc_key' => 'abc_value' }
+  key = nil
+
+  a.each_key  do |k|
+    key = k
+  end
+
+  key == 'abc_key'
+end
+
+assert('Hash#each_value', '15.2.13.4.11') do
+  a = { 'abc_key' => 'abc_value' }
+  value = nil
+
+  a.each_value  do |v|
+    value = v
+  end
+
+  value == 'abc_value'
+end
+
+assert('Hash#empty?', '15.2.13.4.12') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  not a.empty? and b.empty?
+end
+
+assert('Hash#has_key?', '15.2.13.4.13') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.has_key?('abc_key') and not b.has_key?('cba')
+end
+
+assert('Hash#has_value?', '15.2.13.4.14') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.has_value?('abc_value') and not b.has_value?('cba')
+end
+
+assert('Hash#include?', '15.2.13.4.15') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.include?('abc_key') and not b.include?('cba')
+end
+
+assert('Hash#initialize copy', '15.2.13.4.17') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new.initialize_copy(a)
+
+  b == { 'abc_key' => 'abc_value' }
+end
+
+assert('Hash#key?', '15.2.13.4.18') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.key?('abc_key') and not b.key?('cba')
+end
+
+assert('Hash#keys', '15.2.13.4.19') do
+  a = { 'abc_key' => 'abc_value' }
+
+  a.keys == ['abc_key']
+end
+
+assert('Hash#length', '15.2.13.4.20') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.length == 1 and b.length == 0
+end
+
+assert('Hash#member?', '15.2.13.4.21') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.member?('abc_key') and not b.member?('cba')
+end
+
+assert('Hash#merge', '15.2.13.4.22') do
+  a = { 'abc_key' => 'abc_value', 'cba_key' => 'cba_value' } 
+  b = { 'cba_key' => 'XXX',  'xyz_key' => 'xyz_value' } 
+
+  result_1 = a.merge b
+  result_2 = a.merge(b) do |key, original, new|
+    original
+  end
+
+  result_1 == {'abc_key' => 'abc_value', 'cba_key' => 'XXX',  
+               'xyz_key' => 'xyz_value' } and
+  result_2 == {'abc_key' => 'abc_value', 'cba_key' => 'cba_value',  
+               'xyz_key' => 'xyz_value' }
+end
+
+assert('Hash#replace', '15.2.13.4.23') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new.replace(a)
+
+  b == { 'abc_key' => 'abc_value' }
+end
+
+assert('Hash#shift', '15.2.13.4.24') do
+  a = { 'abc_key' => 'abc_value', 'cba_key' => 'cba_value' }
+  # TODO Broken ATM (Hash instead of Array
+  b = a.shift
+
+  a == { 'abc_key' => 'abc_value' }
+end
+
+assert('Hash#size', '15.2.13.4.25') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.size == 1 and b.size == 0
+end
+
+assert('Hash#store', '15.2.13.4.26') do
+  a = Hash.new
+  a.store('abc', 'abc')
+
+  a['abc'] == 'abc'
+end
+
+assert('Hash#value?', '15.2.13.4.27') do
+  a = { 'abc_key' => 'abc_value' }
+  b = Hash.new
+
+  a.value?('abc_value') and not b.value?('cba')
+end
+
+assert('Hash#values', '15.2.13.4.28') do
+  a = { 'abc_key' => 'abc_value' }
+
+  a.values == ['abc_value']
+end
+