Improve Symbol Tests

test/t/symbol.rb

@@ -2,25 +2,26 @@
 # Symbol ISO Test
 
 assert('Symbol', '15.2.11') do
-  Symbol.class == Class
+  assert_equal Symbol.class, Class
 end
 
 assert('Symbol superclass', '15.2.11.2') do
-  Symbol.superclass == Object
+  assert_equal Symbol.superclass, Object
 end
 
 assert('Symbol#===', '15.2.11.3.1') do
-  :abc === :abc and not :abc === :cba
+  assert_true :abc == :abc
+  assert_false :abc == :cba
 end
 
 assert('Symbol#id2name', '15.2.11.3.2') do
-  :abc.id2name == 'abc'
+  assert_equal :abc.id2name, 'abc'
 end
 
 assert('Symbol#to_s', '15.2.11.3.3') do
-  :abc.to_s == 'abc'
+  assert_equal :abc.to_s, 'abc'
 end
 
 assert('Symbol#to_sym', '15.2.11.3.4') do
-  :abc.to_sym == :abc
+  assert_equal :abc.to_sym, :abc
 end