Fixes tests with nested exception backtraces on Ruby master

Ruby master did the following changes (and probably more)
https://bugs.ruby-lang.org/issues/16495
https://bugs.ruby-lang.org/issues/20275

Author: MaxLap

actionpack/test/dispatch/debug_exceptions_test.rb

@@ -45,15 +45,26 @@ def method_that_raises
     end
 
     def raise_nested_exceptions
+      raise_nested_exceptions_third
+    end
+
+    def raise_nested_exceptions_first
       raise "First error"
+    end
+
+    def raise_nested_exceptions_second
+      raise_nested_exceptions_first
     rescue
-      begin
-        raise "Second error"
-      rescue
-        raise "Third error"
-      end
+      raise "Second error"
     end
 
+    def raise_nested_exceptions_third
+      raise_nested_exceptions_second
+    rescue
+      raise "Third error"
+    end
+
+
     def call(env)
       env["action_dispatch.show_detailed_exceptions"] = @detailed
       req = ActionDispatch::Request.new(env)
@@ -641,29 +652,67 @@ def self.build_app(app, *args)
       Information for: RuntimeError (Third error):
     MSG
 
-    assert_match Regexp.new(<<~REGEX.strip), paragraphs[2].lines[0..2].join
-      \\A.*in `rescue in rescue in raise_nested_exceptions'
-      .*in `rescue in raise_nested_exceptions'
-      .*in `raise_nested_exceptions'
-    REGEX
-
-    assert_includes(paragraphs[3], <<~MSG.strip)
-      Information for cause: RuntimeError (Second error):
-    MSG
-
-    assert_match Regexp.new(<<~REGEX.strip), paragraphs[4].lines[0..1].join
-      \\A.*in `rescue in raise_nested_exceptions'
-      .*in `raise_nested_exceptions'
-    REGEX
-
-
-    assert_includes(paragraphs[5], <<~MSG.strip)
-      Information for cause: RuntimeError (First error):
-    MSG
-
-    assert_match Regexp.new(<<~REGEX.strip), paragraphs[6].lines[0]
-      \\A.*in `raise_nested_exceptions'
-    REGEX
+    if RUBY_VERSION >= "3.4"
+      # Changes to the format of exception backtraces
+      # https://bugs.ruby-lang.org/issues/16495 (use single quote instead of backtrace)
+      # https://bugs.ruby-lang.org/issues/20275 (don't have entry for rescue in)
+      # And probably more, they now show the class too
+      assert_match Regexp.new(<<~REGEX.strip), paragraphs[2]
+        \\A.*in '.*raise_nested_exceptions_third'
+        .*in '.*raise_nested_exceptions'
+      REGEX
+
+      assert_includes(paragraphs[3], <<~MSG.strip)
+        Information for cause: RuntimeError (Second error):
+      MSG
+
+      assert_match Regexp.new(<<~REGEX.strip), paragraphs[4]
+        \\A.*in '.*raise_nested_exceptions_second'
+        .*in '.*raise_nested_exceptions_third'
+        .*in '.*raise_nested_exceptions'
+      REGEX
+
+
+      assert_includes(paragraphs[5], <<~MSG.strip)
+        Information for cause: RuntimeError (First error):
+      MSG
+
+      assert_match Regexp.new(<<~REGEX.strip), paragraphs[6]
+        \\A.*in '.*raise_nested_exceptions_first'
+        .*in '.*raise_nested_exceptions_second'
+        .*in '.*raise_nested_exceptions_third'
+        .*in '.*raise_nested_exceptions'
+      REGEX
+    else
+      assert_match Regexp.new(<<~REGEX.strip), paragraphs[2]
+        \\A.*in `rescue in raise_nested_exceptions_third'
+        .*in `raise_nested_exceptions_third'
+        .*in `raise_nested_exceptions'
+      REGEX
+
+      assert_includes(paragraphs[3], <<~MSG.strip)
+        Information for cause: RuntimeError (Second error):
+      MSG
+
+      assert_match Regexp.new(<<~REGEX.strip), paragraphs[4]
+        \\A.*in `rescue in raise_nested_exceptions_second'
+        .*in `raise_nested_exceptions_second'
+        .*in `raise_nested_exceptions_third'
+        .*in `raise_nested_exceptions'
+      REGEX
+
+
+      assert_includes(paragraphs[5], <<~MSG.strip)
+        Information for cause: RuntimeError (First error):
+      MSG
+
+      assert_match Regexp.new(<<~REGEX.strip), paragraphs[6]
+        \\A.*in `raise_nested_exceptions_first'
+        .*in `raise_nested_exceptions_second'
+        .*in `raise_nested_exceptions_third'
+        .*in `raise_nested_exceptions'
+      REGEX
+    end
   end
 
   test "display backtrace when error type is SyntaxError" do
@@ -783,28 +832,28 @@ def self.build_app(app, *args)
         # Possible Ruby 3.4-dev bug: https://bugs.ruby-lang.org/issues/19117#note-45
         # assert application trace refers to line that raises the last exception
         assert_select "#Application-Trace-0" do
-          assert_select "code a:first", %r{in '.*raise_nested_exceptions'}
+          assert_select "code a:first", %r{in '.*raise_nested_exceptions_third'}
         end
 
         # assert the second application trace refers to the line that raises the second exception
         assert_select "#Application-Trace-1" do
-          assert_select "code a:first", %r{in '.*raise_nested_exceptions'}
+          assert_select "code a:first", %r{in '.*raise_nested_exceptions_second'}
         end
       else
         # assert application trace refers to line that raises the last exception
         assert_select "#Application-Trace-0" do
-          assert_select "code a:first", %r{in [`']rescue in rescue in .*raise_nested_exceptions'}
+          assert_select "code a:first", %r{in [`']rescue in .*raise_nested_exceptions_third'}
         end
 
         # assert the second application trace refers to the line that raises the second exception
         assert_select "#Application-Trace-1" do
-          assert_select "code a:first", %r{in [`']rescue in .*raise_nested_exceptions'}
+          assert_select "code a:first", %r{in [`']rescue in .*raise_nested_exceptions_second'}
         end
       end
 
       # assert the third application trace refers to the line that raises the first exception
       assert_select "#Application-Trace-2" do
-        assert_select "code a:first", %r{in [`'].*raise_nested_exceptions'}
+        assert_select "code a:first", %r{in [`'].*raise_nested_exceptions_first'}
       end
     end
   end