Improve false tests

test/t/false.rb

@@ -2,29 +2,32 @@
 # FalseClass ISO Test
 
 assert('FalseClass', '15.2.6') do
-  FalseClass.class == Class
+  assert_equal FalseClass.class, Class
 end
 
 assert('FalseClass superclass', '15.2.6.2') do
-  FalseClass.superclass == Object
+  assert_equal FalseClass.superclass, Object
 end
 
 assert('FalseClass false', '15.2.6.1') do
-  not false
+  assert_false false
 end
 
 assert('FalseClass#&', '15.2.6.3.1') do
-  not false.&(true) and not false.&(false)
+  assert_false false.&(true)
+  assert_false false.&(false)
 end
 
 assert('FalseClass#^', '15.2.6.3.2') do
-  false.^(true) and not false.^(false)
+  assert_true false.^(true)
+  assert_false false.^(false)
 end
 
 assert('FalseClass#to_s', '15.2.6.3.3') do
-  false.to_s == 'false'
+  assert_equal false.to_s, 'false'
 end
 
 assert('FalseClass#|', '15.2.6.3.4') do
-  false.|(true) and not false.|(false)
+  assert_true false.|(true)
+  assert_false false.|(false)
 end