define Range#match? if Ruby < 2.4

See the rationale in the documentation included in this patch.

We are going to gradually introduce this predicate in the code base.

1 files changed, 24 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/regexp_ext_test.rb b/activesupport/test/core_ext/regexp_ext_test.rb
index c2398d31bd..d91e363085 100644
--- a/activesupport/test/core_ext/regexp_ext_test.rb
+++ b/activesupport/test/core_ext/regexp_ext_test.rb
@@ -7,4 +7,28 @@ class RegexpExtAccessTests < ActiveSupport::TestCase
     assert_equal false, //.multiline?
     assert_equal false, /(?m:)/.multiline?
   end
+
+  # Based on https://github.com/ruby/ruby/blob/trunk/test/ruby/test_regexp.rb.
+  def test_match_p
+    /back(...)/ =~ 'backref'
+    # must match here, but not in a separate method, e.g., assert_send,
+    # to check if $~ is affected or not.
+    assert_equal false, //.match?(nil)
+    assert_equal true, //.match?("")
+    assert_equal true, /.../.match?(:abc)
+    assert_raise(TypeError) { /.../.match?(Object.new) }
+    assert_equal true, /b/.match?('abc')
+    assert_equal true, /b/.match?('abc', 1)
+    assert_equal true, /../.match?('abc', 1)
+    assert_equal true, /../.match?('abc', -2)
+    assert_equal false, /../.match?("abc", -4)
+    assert_equal false, /../.match?("abc", 4)
+    assert_equal true, /\z/.match?("")
+    assert_equal true, /\z/.match?("abc")
+    assert_equal true, /R.../.match?("Ruby")
+    assert_equal false, /R.../.match?("Ruby", 1)
+    assert_equal false, /P.../.match?("Ruby")
+    assert_equal 'backref', $&
+    assert_equal 'ref', $1
+  end
 end