add a test file for nested breakpont

test/debug/nested_break_test.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require_relative '../support/test_case'
+
+module DEBUGGER__
+  class NestedBreakAtMethodsTest < TestCase
+    def program
+      <<~RUBY
+       1| def foo a
+       2|   b = a + 1  # break
+       3| end
+       4| x = 1        # break
+       5| x = 2
+       6| x = 3
+      RUBY
+    end
+
+    def test_nested_break
+      debug_code program do
+        type 'break 2'
+        type 'break 4'
+        type 'c'
+        assert_line_num 4
+        type 'p foo(42)'
+
+        if TracePoint.respond_to? :allow_reentry
+          # nested break
+          assert_line_num 2
+          type 'p a'
+          assert_line_text(/42/)
+          type 'c'
+        end
+
+        # pop nested break
+        assert_line_text(/43/)
+        type 'c'
+      end
+    end
+  end
+end
+