first commit

nghttp2/third-party/mruby/test/t/nil.rb

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+##
+# NilClass ISO Test
+
+assert('NilClass', '15.2.4') do
+  assert_equal Class, NilClass.class
+end
+
+assert('NilClass', '15.2.4.1') do
+  assert_equal NilClass, nil.class
+  assert_false NilClass.method_defined? :new
+end
+
+assert('NilClass#&', '15.2.4.3.1') do
+  assert_false nil.&(true)
+  assert_false nil.&(nil)
+end
+
+assert('NilClass#^', '15.2.4.3.2') do
+  assert_true nil.^(true)
+  assert_false nil.^(false)
+end
+
+assert('NilClass#|', '15.2.4.3.3') do
+  assert_true nil.|(true)
+  assert_false nil.|(false)
+end
+
+assert('NilClass#nil?', '15.2.4.3.4') do
+  assert_true nil.nil?
+end
+
+assert('NilClass#to_s', '15.2.4.3.5') do
+  assert_equal '', nil.to_s
+end
+
+assert('safe navigation') do
+  assert_nil nil&.size
+  assert_equal 0, []&.size
+end