diff --git a/spec/support/matchers/flash_message_matchers.rb b/spec/support/matchers/flash_message_matchers.rb
deleted file mode 100644
index 8d2f1febb1..0000000000
--- a/spec/support/matchers/flash_message_matchers.rb
+++ /dev/null
@@ -1,33 +0,0 @@
-# frozen_string_literal: true
-
-RSpec::Matchers.define :have_flash_message do |message|
-  match do |node|
-    @message, @node = message, node
-
-    # Ignore leading and trailing whitespace. Later versions of Capybara have :exact_text option.
-    # The :exact option is not supported in has_selector?.
-    message_substring_regex = substring_match_regex(message)
-    node.has_selector?(".flash", text: message_substring_regex, visible: false)
-  end
-
-  failure_message do |_actual|
-    "expected to find flash message ##{@message}"
-  end
-
-  match_when_negated do |node|
-    @message, @node = message, node
-
-    # Ignore leading and trailing whitespace. Later versions of Capybara have :exact_text option.
-    # The :exact option is not supported in has_selector?.
-    message_substring_regex = substring_match_regex(message)
-    node.has_no_selector?(".flash", text: message_substring_regex, visible: false)
-  end
-
-  failure_message_when_negated do |_actual|
-    "expected not to find flash message ##{@message}"
-  end
-
-  def substring_match_regex(text)
-    /\A\s*#{Regexp.escape(text)}\s*\Z/
-  end
-end