Fix test suite for ruby 3.0 change for methods on subclass of Array

mtasaka · mtasaka · commit c1c150347496 · 2021-02-21T23:04:03.000+09:00
With ruby 3.0, especially with ruby/ruby#3690 , for subclass of Array, `flatten` method now returns the instance of Array, not of the subclass. To keep the object instance of the subclass, use `flatten!` instead.
diff --git a/test/unit/debug.rb b/test/unit/debug.rb
@@ -24,7 +24,8 @@ def test_creation
     ["   \n", :space],
     ["[]", :method],
     [:end_line, :head],
-  ].flatten
+  ]
+  TEST_INPUT.flatten!
   TEST_OUTPUT = <<-'DEBUG'.chomp
 integer(10)operator((\\\))string<content(test)>head[
 
diff --git a/test/unit/statistic.rb b/test/unit/statistic.rb
@@ -24,7 +24,8 @@ def test_creation
     ["   \n", :space],
     ["[]", :method],
     [:end_line, :test],
-  ].flatten
+  ]
+  TEST_INPUT.flatten!
   TEST_OUTPUT = <<-'DEBUG'
 
 Code Statistics
@@ -56,4 +57,4 @@ def test_filtering_text_tokens
     assert_equal TEST_OUTPUT, TEST_INPUT.statistic
   end
   
-end
+end
