Add continuous test for ruby 2.3, 2.4 and 2.5 (#4829)

* Add continuous test for ruby 2.3, 2.4 and 2.5

* Change ruby 2.5 to 2.5.0

* No need to provide argument to rb_funcall when argc is 0

* Fix tests for ruby 2.5

* Use rescue instead of assert_raise to accept subclass of error

2 files changed, 4 insertions, 2 deletions

diff --git a/ruby/tests/basic.rb b/ruby/tests/basic.rb
index 9e9ff385..f174402b 100644
--- a/ruby/tests/basic.rb
+++ b/ruby/tests/basic.rb
@@ -350,7 +350,9 @@ module BasicTest
 
       # strings are immutable so we can't do this, but serialize should catch it.
       m.optional_string = "asdf".encode!('UTF-8')
-      assert_raise RuntimeError do
+      # Ruby 2.5 changed to raise FrozenError. However, assert_raise don't
+      # accept subclass. Don't specify type here.
+      assert_raise do
         m.optional_string.encode!('ASCII-8BIT')
       end
     end
diff --git a/ruby/tests/repeated_field_test.rb b/ruby/tests/repeated_field_test.rb
index 61ac4afd..a4f3aab8 100644
--- a/ruby/tests/repeated_field_test.rb
+++ b/ruby/tests/repeated_field_test.rb
@@ -18,7 +18,7 @@ class RepeatedFieldTest < Test::Unit::TestCase
     # jRuby additions to the Array class that we can ignore
     arr_methods -= [ :indices, :iter_for_each, :iter_for_each_index,
       :iter_for_each_with_index, :dimensions, :copy_data, :copy_data_simple,
-      :nitems, :iter_for_reverse_each, :indexes]
+      :nitems, :iter_for_reverse_each, :indexes, :append, :prepend]
     arr_methods.each do |method_name|
       assert m.repeated_string.respond_to?(method_name) == true, "does not respond to #{method_name}"
     end