1 files changed, 36 insertions, 0 deletions
diff --git a/test/-ext-/array/test_resize.rb b/test/-ext-/array/test_resize.rb
new file mode 100644
index 0000000000..d393620c55
--- /dev/null
+++ b/test/-ext-/array/test_resize.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: false
+require 'test/unit'
+require '-test-/array/resize'
+
+class Test_Array < Test::Unit::TestCase
+  using Module.new {
+    refine(Array) {
+      def __resize__(len) ::Bug::Array.__resize__(self, len); end
+    }
+  }
+
+  class TestResize < Test::Unit::TestCase
+    def test_expand
+      feature = '[ruby-dev:42912]'
+      ary = [*1..10]
+      ary.__resize__(10)
+      assert_equal(10, ary.size, feature)
+      assert_equal([*1..10], ary, feature)
+      ary.__resize__(100)
+      assert_equal(100, ary.size, feature)
+      assert_equal([*1..10]+[nil]*90, ary, feature)
+      ary.__resize__(20)
+      assert_equal(20, ary.size, feature)
+      assert_equal([*1..10]+[nil]*10, ary, feature)
+      ary.__resize__(2)
+      assert_equal(2, ary.size, feature)
+      assert_equal([1,2], ary, feature)
+      ary.__resize__(3)
+      assert_equal(3, ary.size, feature)
+      assert_equal([1,2,nil], ary, feature)
+      ary.__resize__(10)
+      assert_equal(10, ary.size, feature)
+      assert_equal([1,2]+[nil]*8, ary, feature)
+    end
+  end
+end